Podcasts about seds

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Best podcasts about seds

Latest podcast episodes about seds

Governo do Estado de São Paulo
Boletim: SP define diretrizes para Sistema de Assistência Social - 24.02.25

Governo do Estado de São Paulo

Play Episode Listen Later Feb 24, 2025 2:20


A Secretaria de Desenvolvimento Social do Estado de São Paulo (SEDS) atualizou as diretrizes para a atuação do Sistema Único de Assistência Social (SUAS) em situações de calamidade e emergência no estado de São Paulo. A Resolução SEDS nº 06, de 19 de fevereiro de 2025, tem o objetivo de qualificar a atuação da assistência social, definir parâmetros de atuação e garantir, através dos municípios e de forma ágil, o acesso da população mais vulnerável, a serviços, benefícios socioassistenciais e recursos estaduais em situações de emergência ou calamidade.

There is a Method to the Madness
Precision in Fitness Routines for Enhanced Performance

There is a Method to the Madness

Play Episode Listen Later Oct 6, 2024 17:53 Transcription Available


Send us a textAre you ready to transform your fitness routine by mastering the principle of specificity? Join me, Rob Maxwell, as we uncover why a one-size-fits-all approach to exercise may be holding you back from achieving your true potential. Discover how the SEDS principle—Specific Adaptations to Imposed Demands—plays a vital role in ensuring your body responds exactly how you want it to. By contrasting targeted training with the outdated notion of generality, you'll learn why being proficient in one area doesn't automatically translate to success in another. From running to cycling, we explore how understanding and aligning your training with your personal fitness goals is key to unlocking optimal performance.In our exploration of specific training goals, we emphasize the importance of combining strength training with aerobic exercises not only for peak performance but also for enhancing overall health. For those dedicated to improving general fitness, activities like biking and swimming provide a flexible path. However, if you're aiming for specific outcomes, tailored training strategies are the game-changer. I'll guide you through the maze of options, ensuring your workouts are as unique as your objectives. Tune in to gain actionable insights that will help you navigate your fitness journey with precision and purpose.

Seeing Eye Dogs Show
Phoebe and Angie's story, Youth Program, Jack and training SEDs

Seeing Eye Dogs Show

Play Episode Listen Later Sep 20, 2024 29:06 Transcription Available


On this episode of the Seeing Eye Dogs Show, Harriet is joined by two guests. The first is with Phoebe, Seeing Eye Dogs handler to Angela, kennels volunteer and graduate of our Youth Program. We're going to talk her life as a handler, experiences on the Youth Program and partnership with Angie. Then I'll be joined by Trainee Trainer Jack Lord about the role as a trainer and how staff like Jack train our young dogs in guide work so they can become Seeing Eye Dogs. Jack's been on the show before in his previous roles through the years, you can find more interviews with Jack on our OMNY FM platform. If you've been considering dog guide mobility please contact us by calling 1800 037 773 or email info@seda.org.au. We're also open for applications now for young people who are blind or have low vision to take part in our 2025 Youth Program. People from 12-18 are interested in finding out about dog guide mobility and enhance their skills can work with their O&M and Seeing Eye Dogs staff to work on their O&M skills and find out what life with a SED is like. Applications for the 2025 Youth Program are open now, so head to our website to find out more at sed.visionaustralia.org/youth-program, email Brooke at Brooke.Anderson@visionaustralia.org. If you'd like to find out more about Seeing Eye Dogs head to our website: https://sed.visionaustralia.org/See omnystudio.com/listener for privacy information.

Governo do Estado de São Paulo
Número de unidades do Bom Prato Móvel cresce 66% no estado de São Paulo

Governo do Estado de São Paulo

Play Episode Listen Later Sep 10, 2024 1:17


Rita Dalmaso - Titular da Coordenadoria de Segurança Alimenntar (COSAN) da SEDS

I Had Trials Once...
Gareth Seddon | Training with Paul Gascoigne, Phone calls with Gary Neville & Career ending illness?

I Had Trials Once...

Play Episode Listen Later Jul 24, 2024 99:44


I Had Trials Once is back again for another episode...This week Jordan & Gary Stopforth are hosting a special episode of the pod and are joined by our very own...Gareth Seddon!Gaz sits down with the boys to discuss his early career in football and spending 8 years in Blackburn Rover's academy.The lads then chat about Gaz joining the RAF before joining Everton on trial and training with Paul Gascoigne & Duncan Ferguson.Gaz then openly discusses his difficult spell with injuries including a blood disease that ended his career in league football at 24!Seds then talks about his return to football at the age of 27 with Hyde United before joining Fleetwood town and playing alongside Jamie Vardy.Finally, Gaz speaks about how Gary Neville convinced him to join Salford City, The Class Of 92' Documentary and his new life as a football agent.

I Had Trials Once...
Scrapping with Seds & becoming Salford City boss for the Class of '92 | Anthony Johnson (Part One)

I Had Trials Once...

Play Episode Listen Later Aug 20, 2023 57:26


After almost 5 years of trying to get him on, one of the most requested guests finally said yes...Former Salford City and now Radcliffe Borough co-manager Anthony Johnson joins Gareth Seddon and Jordan Hulme for the I Had Trials Once podcast that had to become a two-parter there's so much in there!Jonno talks about his playing career and the early stages of his managerial career, which resulted in him getting the job working under Premier League legend and host of The Overlap, Gary Neville and the Class of '92 at Salford City.Part two to follow next week!

All TWiT.tv Shows (MP3)
This Week in Space 56: Students in Space

All TWiT.tv Shows (MP3)

Play Episode Listen Later Apr 7, 2023 64:38


Students for the Exploration and Development of Space has been preparing young people for space careers since its founding in 1980. With chapters in 14 countries and countless universities, the organization has expanded exponentially since then. Join us as we talk to Sara Alvarado and Audrey Scott about this dynamic, youth-empowering group! Hosts: Rod Pyle and Tariq Malik Guests: Sara Alvarado and Audrey Scott Download or subscribe to this show at https://twit.tv/shows/this-week-in-space. Get episodes ad-free with Club TWiT at https://twit.tv/clubtwit Sponsor: bitwarden.com/twit

This Week in Space (Audio)
TWiS 56: Students in Space - Space Careers With Students for the Exploration and Development of Space

This Week in Space (Audio)

Play Episode Listen Later Apr 7, 2023 64:38


Students for the Exploration and Development of Space has been preparing young people for space careers since its founding in 1980. With chapters in 14 countries and countless universities, the organization has expanded exponentially since then. Join us as we talk to Sara Alvarado and Audrey Scott about this dynamic, youth-empowering group! Hosts: Rod Pyle and Tariq Malik Guests: Sara Alvarado and Audrey Scott Download or subscribe to this show at https://twit.tv/shows/this-week-in-space. Get episodes ad-free with Club TWiT at https://twit.tv/clubtwit Sponsor: bitwarden.com/twit

All TWiT.tv Shows (Video LO)
This Week in Space 56: Students in Space

All TWiT.tv Shows (Video LO)

Play Episode Listen Later Apr 7, 2023 64:38


Students for the Exploration and Development of Space has been preparing young people for space careers since its founding in 1980. With chapters in 14 countries and countless universities, the organization has expanded exponentially since then. Join us as we talk to Sara Alvarado and Audrey Scott about this dynamic, youth-empowering group! Hosts: Rod Pyle and Tariq Malik Guests: Sara Alvarado and Audrey Scott Download or subscribe to this show at https://twit.tv/shows/this-week-in-space. Get episodes ad-free with Club TWiT at https://twit.tv/clubtwit Sponsor: bitwarden.com/twit

The Sound of Space
15: SPECIAL EDITION of TSOS Interviews - Who Won the Space Race? (Conversations from the 2023 SEDS Canadian Space Conference)

The Sound of Space

Play Episode Listen Later Feb 16, 2023 33:00


Coming at you live from the 2023 SEDS Canadian Space Conference, this special edition of TSOS Interviews includes conversations with several students and young professionals to gauge their responses on the question: Who won the space race?    In the fifteenth episode of The Sound of Space podcast, we learn about different paths that space enthusiasts took to get into the field and their take on the big event that started it all. Tune in to hear some funny, controversial, and surprising conversations... and to find out once and for all... who won the space race? A special thank you to SEDS-ÉEDS Canada and PolyOrbite for hosting the 2023 Canadian Space Conference and to all of the interview guests for sharing their valuable experiences and insights with us. Continue the conversation over on our Instagram account @_thesoundofspace or LinkedIn at The Sound of Space (TSOS) and let us know your thoughts on this episode! University of Toronto Land Acknowledgment TSOS is brought to you by the University of Toronto Aerospace Team (UTAT). UTAT is an interdisciplinary student design team with four technical divisions. Visit utat.ca to learn more! CREDITS & TEAM Hosts: Theodora Girgis, Ketan Vasudeva Sound Engineer: Forrest McAdam Marketing & Graphics: Bonney Wu Research Team: Afrin Prio, Jillian Unruh, Lianne Choong

Astro arXiv | all categories
SN 2018gk Revisited: the Photosphere, the Central Engine, And the Putative Dust

Astro arXiv | all categories

Play Episode Listen Later Nov 30, 2022 0:52


SN 2018gk Revisited: the Photosphere, the Central Engine, And the Putative Dust by Tao Wang et al. on Wednesday 30 November In this paper, we perform a comprehensive study for the physical properties of SN 2018gk which is a luminous type IIb supernova (SN). We find that the early-time photospheric velocity vary from a larger value to a smaller value before the photosphere reach a temperature floor. We generalize the photosphere modulus and fit the multiband light curves (LCs) of SN 2018gk. We find that the $^{56}$Ni mass model require $sim$1.1 M$_odot$ of $^{56}$Ni which is larger than the derived ejecta mass ($sim$0.58 M$_odot$) as well as the derived $^{56}$Ni mass ($sim$0.4 M$_odot$) in the literature. Alternatively, we use the magnetar plus $^{56}$Ni and the fallback plus $^{56}$Ni models to fit the LCs of SN 2018gk, finding that the two models can can fit the LCs. We favor the magnetar plus $^{56}$Ni since the parameters are well constrained and rather reasonable ($M_{rm ej} =$ 2.80 M$_odot$, $M_{rm Ni}=0.16 $ M$_odot$ which is smaller than the upper limit of the value of the $^{56}$Ni mass can by synthesized by the neutrino-powered core collapse SNe, $B=8.47times10^{14}$ G which is comparable to those of luminous and superluminous SNe studied in the literature, and $P_0=$ 10.83 ms which is comparable to those of luminous SNe). Therefore, we suggest that SN 2018gk might be a SNe IIb mainly powered by a central engine. Finally, we confirm the NIR excesses of the SEDs of SN 2018gk at some epochs and constrain the physical properties of the putative dust using the blackbody plus dust emission model. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.15966v1

Astro arXiv | all categories
PHANGS-JWST First Results: Dust embedded star clusters in NGC 7496 selected via 3 3 μ m PAH emission

Astro arXiv | all categories

Play Episode Listen Later Nov 30, 2022 1:12


PHANGS-JWST First Results: Dust embedded star clusters in NGC 7496 selected via 3 3 μ m PAH emission by Jimena Rodriguez et al. on Wednesday 30 November The earliest stages of star formation occur enshrouded in dust and are not observable in the optical. Here we leverage the extraordinary new high-resolution infrared imaging from JWST to begin the study of dust-embedded star clusters in nearby galaxies throughout the local volume. We present a technique for identifying dust-embedded clusters in NGC 7496 (18.7 Mpc), the first galaxy to be observed by the PHANGS-JWST Cycle 1 Treasury Survey. We select sources that have strong 3.3$mu$m PAH emission based on a $rm F300M-F335M$ color excess, and identify 67 candidate embedded clusters. Only eight of these are found in the PHANGS-HST optically-selected cluster catalog and all are young (six have SED-fit ages of $sim1$ Myr). We find that this sample of embedded cluster candidates may significantly increase the census of young clusters in NGC 7496 from the PHANGS-HST catalog -- the number of clusters younger than $sim$2 Myr could be increased by a factor of two. Candidates are preferentially located in dust lanes, and are coincident with peaks in PHANGS-ALMA CO (2-1) maps. We take a first look at concentration indices, luminosity functions, SEDs spanning from 2700A to 21$mu$m, and stellar masses (estimated to be between $sim10^4-10^5 M_{odot}$). The methods tested here provide a basis for future work to derive accurate constraints on the physical properties of embedded clusters, characterize the completeness of cluster samples, and expand analysis to all 19 galaxies in the PHANGS-JWST sample, which will enable basic unsolved problems in star formation and cluster evolution to be addressed. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.13426v2

Astro arXiv | all categories
When Spectral Modeling Meets Convolutional Networks: A Method for Discovering Reionization-era Lensed Quasars in Multi-band Imaging Data

Astro arXiv | all categories

Play Episode Listen Later Nov 29, 2022 0:54


When Spectral Modeling Meets Convolutional Networks: A Method for Discovering Reionization-era Lensed Quasars in Multi-band Imaging Data by Irham Taufik Andika et al. on Tuesday 29 November Over the last two decades, around three hundred quasars have been discovered at $zgtrsim6$, yet only one was identified as being strong-gravitationally lensed. We explore a new approach, enlarging the permitted spectral parameter space while introducing a new spatial geometry veto criterion, implemented via image-based deep learning. We made the first application of this approach in a systematic search for reionization-era lensed quasars, using data from the Dark Energy Survey, the Visible and Infrared Survey Telescope for Astronomy Hemisphere Survey, and the Wide-field Infrared Survey Explorer. Our search method consists of two main parts: (i) pre-selection of the candidates based on their spectral energy distributions (SEDs) using catalog-level photometry and (ii) relative probabilities calculation of being a lens or some contaminant utilizing a convolutional neural network (CNN) classification. The training datasets are constructed by painting deflected point-source lights over actual galaxy images to generate realistic galaxy-quasar lens models, optimized to find systems with small image separations, i.e., Einstein radii of $theta_mathrm{E} leq 1$ arcsec. Visual inspection is then performed for sources with CNN scores of $P_mathrm{lens} > 0.1$, which led us to obtain 36 newly-selected lens candidates, waiting for spectroscopic confirmation. These findings show that automated SED modeling and deep learning pipelines, supported by modest human input, are a promising route for detecting strong lenses from large catalogs that can overcome the veto limitations of primarily dropout-based SED selection approaches. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.14543v1

Astro arXiv | all categories
A search for thermal gyro-synchrotron emission from hot stellar coronae

Astro arXiv | all categories

Play Episode Listen Later Nov 29, 2022 1:02


A search for thermal gyro-synchrotron emission from hot stellar coronae by Walter W. Golay et al. on Tuesday 29 November We searched for thermal gyro-synchrotron radio emission from a sample of five radio-loud stars whose X-ray coronae contain a hot ($T_e>10^7$ K) thermal component. We used the JVLA to measure Stokes I and V/I spectral energy distributions (SEDs) over the frequency range 15--45 GHz, determining the best-fitting model parameters using power-law and thermal gyro-synchrotron emission models. The SEDs of the three chromospherically active binaries (Algol, UX Arietis, HR 1099) were well-fit by a power-law gyro-synchrotron model, with no evidence for a thermal component. However, the SEDs of the two weak-lined T Tauri stars (V410 Tau, HD 283572) had a circularly polarized enhancement above 30 GHz that was inconsistent with a pure power-law distribution. These spectra were well-fit by summing the emission from an extended coronal volume of power-law gyro-synchrotron emission and a smaller region with thermal plasma and a much stronger magnetic field emitting thermal gyro-synchrotron radiation. We used Bayesian inference to estimate the physical plasma parameters of the emission regions (characteristic size, electron density, temperature, power-law index, and magnetic field strength and direction) using independently measured radio sizes, X-ray luminosities, and magnetic field strengths as priors, where available. The derived parameters were well-constrained but somewhat degenerate. The power-law and thermal volumes in the pre-main-sequence stars are probably not co-spatial, and we speculate they may arise from two distinct regions: a tangled-field magnetosphere where reconnection occurs and a recently discovered axisymmetric toroidal magnetic field, respectively. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.11440v2

Astro arXiv | all categories
A Panchromatic Study of Massive Stars in the Extremely Metal-Poor Local Group Dwarf Galaxy Leo A

Astro arXiv | all categories

Play Episode Listen Later Nov 29, 2022 0:11


A Panchromatic Study of Massive Stars in the Extremely Metal-Poor Local Group Dwarf Galaxy Leo A by Maude Gull et al. on Tuesday 29 November We characterize massive stars (M>8 M_sun) in the nearby (D~0.8 Mpc) extremely metal-poor (Z~5% Z_sun) galaxy Leo A using Hubble Space Telescope ultra-violet (UV), optical, and near-infrared (NIR) imaging along with Keck/LRIS and MMT/Binospec optical spectroscopy for 18 main sequence OB stars. We find that: (a) 12 of our 18 stars show emission lines, despite not being associated with an H II region, suggestive of stellar activity (e.g., mass loss, accretion, binary star interaction), which is consistent with previous predictions of enhanced activity at low metallicity; (b) 6 are Be stars, which are the first to be spectroscopically studied at such low metallicity -- these Be stars have unusual panchromatic SEDs; (c) for stars well-fit by the TLUSTY non-local thermodynamic equilibrium (non-LTE) models, the photometric and spectroscopic values of T_eff and log(g) agree to within ~0.01 dex and ~0.18 dex, respectively, indicating that NUV/optical/NIR imaging can be used to reliably characterize massive (M ~ 8-30 M_sun) main sequence star properties relative to optical spectroscopy; (d) the properties of the most massive stars in H II regions are consistent with constraints from previous nebular emission line studies; and (e) 13 stars with M>8 M_sun are >40 pc from a known star cluster or H II region. Our sample comprises ~50% of all known massive stars at Z < 10% Z_sun with derived stellar parameters, high-quality optical spectra, and panchromatic photometry. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.14349v1

Astro arXiv | all categories
PHANGS-JWST First Results: Dust embedded star clusters in NGC 7496 selected via 3 3 μ m PAH emission

Astro arXiv | all categories

Play Episode Listen Later Nov 29, 2022 1:12


PHANGS-JWST First Results: Dust embedded star clusters in NGC 7496 selected via 3 3 μ m PAH emission by Jimena Rodriguez et al. on Tuesday 29 November The earliest stages of star formation occur enshrouded in dust and are not observable in the optical. Here we leverage the extraordinary new high-resolution infrared imaging from JWST to begin the study of dust-embedded star clusters in nearby galaxies throughout the local volume. We present a technique for identifying dust-embedded clusters in NGC 7496 (18.7 Mpc), the first galaxy to be observed by the PHANGS-JWST Cycle 1 Treasury Survey. We select sources that have strong 3.3$mu$m PAH emission based on a $rm F300M-F335M$ color excess, and identify 67 candidate embedded clusters. Only eight of these are found in the PHANGS-HST optically-selected cluster catalog and all are young (six have SED-fit ages of $sim1$ Myr). We find that this sample of embedded cluster candidates may significantly increase the census of young clusters in NGC 7496 from the PHANGS-HST catalog -- the number of clusters younger than $sim$2 Myr could be increased by a factor of two. Candidates are preferentially located in dust lanes, and are coincident with peaks in PHANGS-ALMA CO (2-1) maps. We take a first look at concentration indices, luminosity functions, SEDs spanning from 2700A to 21$mu$m, and stellar masses (estimated to be between $sim10^4-10^5 M_{odot}$). The methods tested here provide a basis for future work to derive accurate constraints on the physical properties of embedded clusters, characterize the completeness of cluster samples, and expand analysis to all 19 galaxies in the PHANGS-JWST sample, which will enable basic unsolved problems in star formation and cluster evolution to be addressed. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.13426v2

Astro arXiv | all categories
Disk dissipation, giant planet formation and star-formation-rate fluctuations in the past three-million-year history of Gould's Belt

Astro arXiv | all categories

Play Episode Listen Later Nov 29, 2022 1:05


Disk dissipation, giant planet formation and star-formation-rate fluctuations in the past three-million-year history of Gould's Belt by Mingchao Liu et al. on Tuesday 29 November Although episodic star formation (SF) had been suggested for nearby SF regions, a panoramic view to the latest episodic SF history in the solar neighborhood is still missing. By uniformly constraining the slope $alpha$ of infrared spectral energy distributions (SEDs) of young stellar objects (YSOs) in the 13 largest Gould's Belt (GB) protoclusters surveyed by Spitzer Space Telescope, we have constructed a cluster-averaged histogram of $alpha$ representing YSO evolution lifetime as a function of the $alpha$ value. Complementary to the traditional SED classification scheme (0, I, F, II, III) that is based on different $alpha$ values, a staging scheme (A,B,C,D,E) of SED evolution is advised on the basis of the $alpha$ statistical features that can be better matched to the physical stages of disk dissipation and giant planet formation. This has also allowed us to unravel the fluctuations of star formation rate (SFR) in the past three-million-year (3 Myr) history of these GB protoclusters. Diverse evolutionary patterns such as single peak, double peaks and on-going acceleration of SFR are revealed. The SFR fluctuations are between $20%sim60%$ ($sim40%$ on average) and no dependence on the average SFR or the number of SFR episodes is found. However, spatially close protoclusters tend to share similar SFR fluctuation trends, indicating that the driving force of the fluctuations should be at size scales beyond the typical cluster sizes of several parsec. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.14637v1

Astro arXiv | all categories
SN 2018gk Revisited: the Photosphere, the Central Engine, And the Putative Dust

Astro arXiv | all categories

Play Episode Listen Later Nov 29, 2022 1:02


SN 2018gk Revisited: the Photosphere, the Central Engine, And the Putative Dust by Tao Wang et al. on Tuesday 29 November In this paper, we perform a comprehensive study for the physical properties of SN 2018gk which is a luminous type IIb supernova (SN). We find that the early-time photospheric velocity vary from a larger value to a smaller value before the photosphere reach a temperature floor. We generalize the photosphere modulus and fit the multiband light curves (LCs) of SN 2018gk. We find that the $^{56}$Ni mass model require $sim$1.1 M$_odot$ of $^{56}$Ni which is larger than the derived ejecta mass ($sim$0.58 M$_odot$) as well as the derived $^{56}$Ni mass ($sim$0.4 M$_odot$) in the literature. Alternatively, we use the magnetar plus $^{56}$Ni and the fallback plus $^{56}$Ni models to fit the LCs of SN 2018gk, finding that the two models can can fit the LCs. We favor the magnetar plus $^{56}$Ni since the parameters are well constrained and rather reasonable ($M_{rm ej} =$ 2.80 M$_odot$, $M_{rm Ni}=0.16 $ M$_odot$ which is smaller than the upper limit of the value of the $^{56}$Ni mass can by synthesized by the neutrino-powered core collapse SNe, $B=8.47times10^{14}$ G which is comparable to those of luminous and superluminous SNe studied in the literature, and $P_0=$ 10.83 ms which is comparable to those of luminous SNe). Therefore, we suggest that SN 2018gk might be a SNe IIb mainly powered by a central engine. Finally, we confirm the NIR excesses of the SEDs of SN 2018gk at some epochs and constrain the physical properties of the putative dust using the blackbody plus dust emission model. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.15966v1

Astro arXiv | all categories
PHANGS-JWST First Results: Dust embedded star clusters in NGC 7496 selected via 3 3 μ m PAH emission

Astro arXiv | all categories

Play Episode Listen Later Nov 29, 2022 1:18


PHANGS-JWST First Results: Dust embedded star clusters in NGC 7496 selected via 3 3 μ m PAH emission by Jimena Rodriguez et al. on Tuesday 29 November The earliest stages of star formation occur enshrouded in dust and are not observable in the optical. Here we leverage the extraordinary new high-resolution infrared imaging from JWST to begin the study of dust-embedded star clusters in nearby galaxies throughout the local volume. We present a technique for identifying dust-embedded clusters in NGC 7496 (18.7 Mpc), the first galaxy to be observed by the PHANGS-JWST Cycle 1 Treasury Survey. We select sources that have strong 3.3$mu$m PAH emission based on a $rm F300M-F335M$ color excess, and identify 67 candidate embedded clusters. Only eight of these are found in the PHANGS-HST optically-selected cluster catalog and all are young (six have SED-fit ages of $sim1$ Myr). We find that this sample of embedded cluster candidates may significantly increase the census of young clusters in NGC 7496 from the PHANGS-HST catalog -- the number of clusters younger than $sim$2 Myr could be increased by a factor of two. Candidates are preferentially located in dust lanes, and are coincident with peaks in PHANGS-ALMA CO (2-1) maps. We take a first look at concentration indices, luminosity functions, SEDs spanning from 2700A to 21$mu$m, and stellar masses (estimated to be between $sim10^4-10^5 M_{odot}$). The methods tested here provide a basis for future work to derive accurate constraints on the physical properties of embedded clusters, characterize the completeness of cluster samples, and expand analysis to all 19 galaxies in the PHANGS-JWST sample, which will enable basic unsolved problems in star formation and cluster evolution to be addressed. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.13426v2

Astro arXiv | all categories
A search for thermal gyro-synchrotron emission from hot stellar coronae

Astro arXiv | all categories

Play Episode Listen Later Nov 28, 2022 1:01


A search for thermal gyro-synchrotron emission from hot stellar coronae by Walter W. Golay et al. on Monday 28 November We searched for thermal gyro-synchrotron radio emission from a sample of five radio-loud stars whose X-ray coronae contain a hot ($T_e>10^7$ K) thermal component. We used the JVLA to measure Stokes I and V/I spectral energy distributions (SEDs) over the frequency range 15--45 GHz, determining the best-fitting model parameters using power-law and thermal gyro-synchrotron emission models. The SEDs of the three chromospherically active binaries (Algol, UX Arietis, HR 1099) were well-fit by a power-law gyro-synchrotron model, with no evidence for a thermal component. However, the SEDs of the two weak-lined T Tauri stars (V410 Tau, HD 283572) had a circularly polarized enhancement above 30 GHz that was inconsistent with a pure power-law distribution. These spectra were well-fit by summing the emission from an extended coronal volume of power-law gyro-synchrotron emission and a smaller region with thermal plasma and a much stronger magnetic field emitting thermal gyro-synchrotron radiation. We used Bayesian inference to estimate the physical plasma parameters of the emission regions (characteristic size, electron density, temperature, power-law index, and magnetic field strength and direction) using independently measured radio sizes, X-ray luminosities, and magnetic field strengths as priors, where available. The derived parameters were well-constrained but somewhat degenerate. The power-law and thermal volumes in the pre-main-sequence stars are probably not co-spatial, and we speculate they may arise from two distinct regions: a tangled-field magnetosphere where reconnection occurs and a recently discovered axisymmetric toroidal magnetic field, respectively. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.11440v2

Astro arXiv | all categories
Disk dissipation, giant planet formation and star-formation-rate fluctuations in the past three-million-year history of Gould's Belt

Astro arXiv | all categories

Play Episode Listen Later Nov 28, 2022 0:54


Disk dissipation, giant planet formation and star-formation-rate fluctuations in the past three-million-year history of Gould's Belt by Mingchao Liu et al. on Monday 28 November Although episodic star formation (SF) had been suggested for nearby SF regions, a panoramic view to the latest episodic SF history in the solar neighborhood is still missing. By uniformly constraining the slope $alpha$ of infrared spectral energy distributions (SEDs) of young stellar objects (YSOs) in the 13 largest Gould's Belt (GB) protoclusters surveyed by Spitzer Space Telescope, we have constructed a cluster-averaged histogram of $alpha$ representing YSO evolution lifetime as a function of the $alpha$ value. Complementary to the traditional SED classification scheme (0, I, F, II, III) that is based on different $alpha$ values, a staging scheme (A,B,C,D,E) of SED evolution is advised on the basis of the $alpha$ statistical features that can be better matched to the physical stages of disk dissipation and giant planet formation. This has also allowed us to unravel the fluctuations of star formation rate (SFR) in the past three-million-year (3 Myr) history of these GB protoclusters. Diverse evolutionary patterns such as single peak, double peaks and on-going acceleration of SFR are revealed. The SFR fluctuations are between $20%sim60%$ ($sim40%$ on average) and no dependence on the average SFR or the number of SFR episodes is found. However, spatially close protoclusters tend to share similar SFR fluctuation trends, indicating that the driving force of the fluctuations should be at size scales beyond the typical cluster sizes of several parsec. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.14637v1

Astro arXiv | all categories
When Spectral Modeling Meets Convolutional Networks: A Method for Discovering Reionization-era Lensed Quasars in Multi-band Imaging Data

Astro arXiv | all categories

Play Episode Listen Later Nov 28, 2022 0:54


When Spectral Modeling Meets Convolutional Networks: A Method for Discovering Reionization-era Lensed Quasars in Multi-band Imaging Data by Irham Taufik Andika et al. on Monday 28 November Over the last two decades, around three hundred quasars have been discovered at $zgtrsim6$, yet only one was identified as being strong-gravitationally lensed. We explore a new approach, enlarging the permitted spectral parameter space while introducing a new spatial geometry veto criterion, implemented via image-based deep learning. We made the first application of this approach in a systematic search for reionization-era lensed quasars, using data from the Dark Energy Survey, the Visible and Infrared Survey Telescope for Astronomy Hemisphere Survey, and the Wide-field Infrared Survey Explorer. Our search method consists of two main parts: (i) pre-selection of the candidates based on their spectral energy distributions (SEDs) using catalog-level photometry and (ii) relative probabilities calculation of being a lens or some contaminant utilizing a convolutional neural network (CNN) classification. The training datasets are constructed by painting deflected point-source lights over actual galaxy images to generate realistic galaxy-quasar lens models, optimized to find systems with small image separations, i.e., Einstein radii of $theta_mathrm{E} leq 1$ arcsec. Visual inspection is then performed for sources with CNN scores of $P_mathrm{lens} > 0.1$, which led us to obtain 36 newly-selected lens candidates, waiting for spectroscopic confirmation. These findings show that automated SED modeling and deep learning pipelines, supported by modest human input, are a promising route for detecting strong lenses from large catalogs that can overcome the veto limitations of primarily dropout-based SED selection approaches. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.14543v1

Astro arXiv | all categories
A Panchromatic Study of Massive Stars in the Extremely Metal-Poor Local Group Dwarf Galaxy Leo A

Astro arXiv | all categories

Play Episode Listen Later Nov 28, 2022 0:11


A Panchromatic Study of Massive Stars in the Extremely Metal-Poor Local Group Dwarf Galaxy Leo A by Maude Gull et al. on Monday 28 November We characterize massive stars (M>8 M_sun) in the nearby (D~0.8 Mpc) extremely metal-poor (Z~5% Z_sun) galaxy Leo A using Hubble Space Telescope ultra-violet (UV), optical, and near-infrared (NIR) imaging along with Keck/LRIS and MMT/Binospec optical spectroscopy for 18 main sequence OB stars. We find that: (a) 12 of our 18 stars show emission lines, despite not being associated with an H II region, suggestive of stellar activity (e.g., mass loss, accretion, binary star interaction), which is consistent with previous predictions of enhanced activity at low metallicity; (b) 6 are Be stars, which are the first to be spectroscopically studied at such low metallicity -- these Be stars have unusual panchromatic SEDs; (c) for stars well-fit by the TLUSTY non-local thermodynamic equilibrium (non-LTE) models, the photometric and spectroscopic values of T_eff and log(g) agree to within ~0.01 dex and ~0.18 dex, respectively, indicating that NUV/optical/NIR imaging can be used to reliably characterize massive (M ~ 8-30 M_sun) main sequence star properties relative to optical spectroscopy; (d) the properties of the most massive stars in H II regions are consistent with constraints from previous nebular emission line studies; and (e) 13 stars with M>8 M_sun are >40 pc from a known star cluster or H II region. Our sample comprises ~50% of all known massive stars at Z < 10% Z_sun with derived stellar parameters, high-quality optical spectra, and panchromatic photometry. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.14349v1

Astro arXiv | all categories
A search for thermal gyro-synchrotron emission from hot stellar coronae

Astro arXiv | all categories

Play Episode Listen Later Nov 28, 2022 0:53


A search for thermal gyro-synchrotron emission from hot stellar coronae by Walter W. Golay et al. on Monday 28 November We searched for thermal gyro-synchrotron radio emission from a sample of five radio-loud stars whose X-ray coronae contain a hot ($T_e>10^7$ K) thermal component. We used the JVLA to measure Stokes I and V/I spectral energy distributions (SEDs) over the frequency range 15--45 GHz, determining the best-fitting model parameters using power-law and thermal gyro-synchrotron emission models. The SEDs of the three chromospherically active binaries (Algol, UX Arietis, HR 1099) were well-fit by a power-law gyro-synchrotron model, with no evidence for a thermal component. However, the SEDs of the two weak-lined T Tauri stars (V410 Tau, HD 283572) had a circularly polarized enhancement above 30 GHz that was inconsistent with a pure power-law distribution. These spectra were well-fit by summing the emission from an extended coronal volume of power-law gyro-synchrotron emission and a smaller region with thermal plasma and a much stronger magnetic field emitting thermal gyro-synchrotron radiation. We used Bayesian inference to estimate the physical plasma parameters of the emission regions (characteristic size, electron density, temperature, power-law index, and magnetic field strength and direction) using independently measured radio sizes, X-ray luminosities, and magnetic field strengths as priors, where available. The derived parameters were well-constrained but somewhat degenerate. The power-law and thermal volumes in the pre-main-sequence stars are probably not co-spatial, and we speculate they may arise from two distinct regions: a tangled-field magnetosphere where reconnection occurs and a recently discovered axisymmetric toroidal magnetic field, respectively. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.11440v2

Astro arXiv | all categories
A new look at the infrared properties of z sim 5 galaxies

Astro arXiv | all categories

Play Episode Listen Later Oct 18, 2022 1:06


A new look at the infrared properties of z sim 5 galaxies by L. Sommovigo et al. on Tuesday 18 October Recent ALMA large surveys unveiled the presence of significant dust continuum emission in star-forming galaxies at $z>4$. Unfortunately, such large programs -- i.e. ALPINE ($zsim 5$) and REBELS ($z sim 7$) -- only provide us with a single Far-Infrared (FIR) continuum data point for their individual targets. Therefore, high-$z$ galaxies FIR spectral energy densities (SEDs) remain mostly unconstrained, hinging on an assumption for their dust temperature ($T_{rm d}$) in the SED fitting procedure. This introduces uncertainties in the inferred dust masses ($M_{rm d }$), infrared luminosities ($L_{rm IR}$), and obscured Star Formation Rate (SFR) fraction at $z > 4$. In this work we use a method that allows us to constrain $T_{rm d}$ with a single band measurement by combining the $158 mathrm{mu m}$ continuum information with the overlying [CII] emission line. We analyse the $21$ [CII] and FIR continuum detected $zsim 5$ galaxies in ALPINE, finding a range of $T_{rm d}=25-60 mathrm{K}$ and $M_{rm d} = 0.6-25.1 times 10^{7} mathrm{M_{odot}}$. Given the measured stellar masses of ALPINE galaxies, the inferred dust yields are around $M_{rm d}/M_{star} = (0.2-8) times 10^{-3}$, consistent with theoretical dust-production constraints. We find that $8$ out of $21$ ALPINE galaxies have $L_{rm IR} geq 10^{12} mathrm{L_{odot}}$, comparable to UltraLuminous IR Galaxies (ULIRGs). Relying on ultraviolet-to-optical SED fitting, the SFR was underestimated by up to $2$ orders of magnitude in $4$ of these $8$ ULIRGs-like galaxies. We conclude that these $4$ peculiar sources should be characterised by a two-phase interstellar medium structure with "spatially-segregated" FIR and ultraviolet emitting regions. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.09312v1

Astro arXiv | all categories
Polar Dust Emission in Quasar IR SEDs and Its Correlation with Narrow Line Regions

Astro arXiv | all categories

Play Episode Listen Later Oct 17, 2022 1:04


Polar Dust Emission in Quasar IR SEDs and Its Correlation with Narrow Line Regions by Jianwei Lyu et al. on Monday 17 October Polar dust has been found to play an important role in the mid-infrared emission of nearby Seyfert nuclei. If and how often polar dust exists among the quasar population is unknown due to the lack of spatially-resolved observations. In this Letter, we report correlations between the prominence of AGN forbidden line emission (commonly associated with the narrow line region) and the dust mid-IR energy output among the archetypal Palomar-Green quasar sample and other bright type-1 AGNs drawn from the SDSS, Spitzer and WISE archives. The AGN mid-IR color differences traced by WISE W2 ($sim4.6 mu m$)$-$W3 ($sim12 mu m$) and W2 ($sim4.6 mu m$)$-$W4 ($sim22 mu m$), and near-IR to mid-IR SEDs constrained with 2MASS, WISE and Spitzer data have clear trends with the relative strength of the forbidden line regions traced by the optical OIII and mid-IR OIV emission lines. These observations indicate that, where the lines are strong, a large fraction of the AGN emission at $lambdagtrsim5 mu$m comes from dust in the forbidden line regions. We find that the widely quoted universal AGN template is a result of averaging quasar SEDs with different levels of polar dust emission above the torus output and that the typical intrinsic IR SED of compact torus dust emission alone falls with increasing wavelength past 5 $mu$m (in $nu F_nu$). In addition, the association of polar dust with the forbidden lines suggests an alternative to the receding torus hypothesis for the decrease in infrared output with increasing AGN luminosity. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.08037v1

Astro arXiv | all categories
Dust Temperature and Emission of FirstLight Simulated Galaxies at Cosmic Dawn

Astro arXiv | all categories

Play Episode Listen Later Oct 17, 2022 0:43


Dust Temperature and Emission of FirstLight Simulated Galaxies at Cosmic Dawn by Muzammil Mushtaq et al. on Monday 17 October We study the behavior of dust temperature and its infrared emission of FirstLight1 simulated galaxies at the redshift of 6 and 8, by using POLARIS2 as a Monte Carlo photon transport simulator. To calculate the dust temperature ($T_{dust}$) of the Interstellar medium (ISM) of galaxies, POLARIS requires three essential parameters as an input - (1) The physical characteristics of galaxies such as the spatial distribution of stars and dust, which are taken from FirstLight galaxies. (2) The intrinsic properties of dust grains that are derived from theDiscrete Dipole Approximation Code (DDSCAT) model. (3) The optical properties of star-particles are in the form of their spectral energy distributions (SEDs) which are extracted from the Binary Population and Spectral Synthesis (BPASS) model. Our simulations produced the 3D maps of the equilibrium dust temperature along with the sight-line infrared emission maps of galaxies. Our results show the importance of excess heating of dust by the Cosmic Microwave Background (CMB) radiations at high redshifts that results in increased Mid and Far infrared (M-FIR) dust emission. The different evaluations of dust temperature models relate diversely to the optical and intrinsic properties of galaxies arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2208.08658v2

Astro arXiv | all categories
Transition disks: the observational revolution from SEDs to imaging

Astro arXiv | all categories

Play Episode Listen Later Oct 12, 2022 0:41


Transition disks: the observational revolution from SEDs to imaging by Nienke van der Marel. on Wednesday 12 October Protoplanetary disks surrounding young stars are the birth place of planets. Of particular interest are the transition disks with large inner dust cavities of tens of au, hinting at the presence of massive companions. These cavities were first recognized by a deficit in their Spectral Energy Distribution (SED), later confirmed by millimeter interferometry observations. The Atacama Large Millimeter/submillimeter Array (ALMA) has truly revolutionized the field of spatially resolved imaging of protoplanetary disks in both dust and gas, providing important hints for the origin of gaps and cavities. At the same time, new types of substructures have been revealed. Also infrared observations show a large range of substructures both in resolved imaging, interferometry and spectroscopy. Since the last review paper of transition disks (Protostars and Planets VI), a huge amount of data has been taken, which led to numerous new insights in the origin of transition disks. In this review I will summarize the observational efforts from the past decade, compare their insights with the predictions from SED modeling, analyze the properties of the transition disk population and discuss their role in general disk evolution. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.05539v1

Astro arXiv | all categories
Transition disks: the observational revolution from SEDs to imaging

Astro arXiv | all categories

Play Episode Listen Later Oct 12, 2022 0:41


Transition disks: the observational revolution from SEDs to imaging by Nienke van der Marel. on Wednesday 12 October Protoplanetary disks surrounding young stars are the birth place of planets. Of particular interest are the transition disks with large inner dust cavities of tens of au, hinting at the presence of massive companions. These cavities were first recognized by a deficit in their Spectral Energy Distribution (SED), later confirmed by millimeter interferometry observations. The Atacama Large Millimeter/submillimeter Array (ALMA) has truly revolutionized the field of spatially resolved imaging of protoplanetary disks in both dust and gas, providing important hints for the origin of gaps and cavities. At the same time, new types of substructures have been revealed. Also infrared observations show a large range of substructures both in resolved imaging, interferometry and spectroscopy. Since the last review paper of transition disks (Protostars and Planets VI), a huge amount of data has been taken, which led to numerous new insights in the origin of transition disks. In this review I will summarize the observational efforts from the past decade, compare their insights with the predictions from SED modeling, analyze the properties of the transition disk population and discuss their role in general disk evolution. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.05539v1

Astro arXiv | astro-ph.EP
Transition disks: the observational revolution from SEDs to imaging

Astro arXiv | astro-ph.EP

Play Episode Listen Later Oct 12, 2022 0:41


Transition disks: the observational revolution from SEDs to imaging by Nienke van der Marel. on Wednesday 12 October Protoplanetary disks surrounding young stars are the birth place of planets. Of particular interest are the transition disks with large inner dust cavities of tens of au, hinting at the presence of massive companions. These cavities were first recognized by a deficit in their Spectral Energy Distribution (SED), later confirmed by millimeter interferometry observations. The Atacama Large Millimeter/submillimeter Array (ALMA) has truly revolutionized the field of spatially resolved imaging of protoplanetary disks in both dust and gas, providing important hints for the origin of gaps and cavities. At the same time, new types of substructures have been revealed. Also infrared observations show a large range of substructures both in resolved imaging, interferometry and spectroscopy. Since the last review paper of transition disks (Protostars and Planets VI), a huge amount of data has been taken, which led to numerous new insights in the origin of transition disks. In this review I will summarize the observational efforts from the past decade, compare their insights with the predictions from SED modeling, analyze the properties of the transition disk population and discuss their role in general disk evolution. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.05539v1

Astro arXiv | astro-ph.EP
Transition disks: the observational revolution from SEDs to imaging

Astro arXiv | astro-ph.EP

Play Episode Listen Later Oct 12, 2022 0:41


Transition disks: the observational revolution from SEDs to imaging by Nienke van der Marel. on Wednesday 12 October Protoplanetary disks surrounding young stars are the birth place of planets. Of particular interest are the transition disks with large inner dust cavities of tens of au, hinting at the presence of massive companions. These cavities were first recognized by a deficit in their Spectral Energy Distribution (SED), later confirmed by millimeter interferometry observations. The Atacama Large Millimeter/submillimeter Array (ALMA) has truly revolutionized the field of spatially resolved imaging of protoplanetary disks in both dust and gas, providing important hints for the origin of gaps and cavities. At the same time, new types of substructures have been revealed. Also infrared observations show a large range of substructures both in resolved imaging, interferometry and spectroscopy. Since the last review paper of transition disks (Protostars and Planets VI), a huge amount of data has been taken, which led to numerous new insights in the origin of transition disks. In this review I will summarize the observational efforts from the past decade, compare their insights with the predictions from SED modeling, analyze the properties of the transition disk population and discuss their role in general disk evolution. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.05539v1

Astro arXiv | all categories
A Full Spectral Timing Model for AGN Untangling the Variability in Fairall 9

Astro arXiv | all categories

Play Episode Listen Later Oct 11, 2022 0:52


A Full Spectral Timing Model for AGN Untangling the Variability in Fairall 9 by Scott Hagen et al. on Tuesday 11 October Continuum reverberation mapping of AGN can provide new insight into the nature and geometry of the accretion flow. Some of the X-rays from the central corona irradiating the disc are absorbed, increasing the local disc temperature. This gives an additional re-processed contribution to the spectral energy distribution (SED) which is lagged and smeared relative to the driving X-ray lightcurve. We directly calculate this reverberation from the accretion disc, creating fully time dependent SEDs for a given X-ray light-curve. We apply this to the intensive monitoring data on Faraill 9 (Hern'andez Santisteban et al. 2020), and find that it is not possible to produce the observed UV variability by X-ray reprocessing of the observed lightcurve from the disc. Instead, we find that the majority of the variability must be intrinsic to the UV emission process, adding to evidence from changing-look AGN that this region has a structure which is quite unlike a Shakura-Sunyaev disc. We filter out this long timescale variability and find that reprocessing alone is still insufficient to explain even the fast variability in our assumed geometry of a central source illuminating a flat disc. The amplitude of reprocessing can be increased by any vertical structure such as the BLR and/or an inner disc wind, giving a better match. Fundamentally though the model is missing the major contributor to the variabilty, which is from the UV/EUV emission region itself rather than reprocessing. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.04924v1

Astro arXiv | all categories
The UV Excesses of Supernovae and the Implications for Studying Supernovae and Other Optical Transients

Astro arXiv | all categories

Play Episode Listen Later Oct 10, 2022 0:36


The UV Excesses of Supernovae and the Implications for Studying Supernovae and Other Optical Transients by Tao Wang et al. on Monday 10 October Supernovae (SNe), kilonovae (KNe), tidal disruption events (TDEs), optical afterglows of gamma ray bursts (GRBs), and many other optical transients are important phenomena in time-domain astronomy. Fitting the multi-band light curves (LCs) or the synthesized (pseudo-)bolometric LCs can be used to constrain the physical properties of optical transients. The (UV absorbed) blackbody module is one of the most important modules used to fit the multi-band LCs of optical transients having (UV absorbed) blackbody spectral energy distributions (SEDs). We find, however, that the SEDs of some SNe show UV excesses, which cannot be fitted by the model including a (UV absorbed) blackbody module. We construct the bolometric LCs and employ the (cooling plus) Ni model to fit the constructed bolometric LCs, obtaining decent fits. Our results demonstrate that the optical transients showing UV excesses cannot be fitted by the multi-band models that include (UV-absorbed) blackbody module, but can be well modeled by constructing and fitting their bolometric LCs. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.04119v1

Astro arXiv | all categories
Modeling the time variable spectral energy distribution of the blazar CTA 102 from 2008 to 2022

Astro arXiv | all categories

Play Episode Listen Later Oct 10, 2022 0:58


Modeling the time variable spectral energy distribution of the blazar CTA 102 from 2008 to 2022 by N. Sahakyan et al. on Monday 10 October We present long-term multiwavelength observations of blazar CTA 102 ($z=1.037$). Detailed temporal and spectral analyses of $gamma$-ray, X-ray and UV/optical data observed by {it Fermi}-LAT, Swift XRT, NuSTAR and Swift-UVOT over a period of 14 years, between August 2008 and March 2022, was performed. We found strong variability of source emission in all the considered bands, especially in the $gamma$-ray band it exhibited extreme outbursts when the flux crossed the level of $10^{-5}:{rm photon:cm^{-2}:s^{-1}}$. Using the Bayesian Blocks algorithm, we split the adaptively binned $gamma$-ray light curve into 347 intervals of quiescent and flaring episodes and for each period built corresponding multiwavelength spectral energy distributions (SEDs), using the available data. Among the considered SEDs, 117 high-quality (quasi) contemporaneous SEDs which have sufficient multiwavelength data, were modeled using JetSeT framework within a one-zone leptonic synchrotron and inverse Compton emission scenario assuming the emitting region is within the broad-line-region and considering internal and external seed photons for the inverse Compton up-scattering. As a result of modeling, the characteristics of the relativistic electron distribution in the jet as well as jet properties are retrieved and their variation in time is investigated. The applied model can adequately explain the assembled SEDs and the modelling shows that the data in the bright flaring periods can be reproduced for high Doppler boosting and magnetic field. The obtained results are discussed in the context of particle cooling in the emitting region. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.04663v1

Astro arXiv | all categories
The Study of Dust Formation of Six Tidal Disruption Events

Astro arXiv | all categories

Play Episode Listen Later Oct 10, 2022 1:33


The Study of Dust Formation of Six Tidal Disruption Events by Xian-Mao Cao et al. on Monday 10 October This paper investigates eleven (UV-)optical-infrared (IR) spectral energy distributions (SEDs) of six tidal disruption events (TDEs), which are ASASSN-14li, ASASSN-15lh, ASASSN-18ul, ASASSN-18zj, PS18kh, and ZTF18acaqdaa. We find that all the SEDs show evident IR excesses. We invoke the blackbody plus dust emission model to fit the SEDs, and find that the model can account for the SEDs. The derived masses of the dust surrounding ASASSN-14li, ASASSN-15lh, ASASSN-18ul, ASASSN-18zj, PS18kh, and ZTF18acaqdaa are respectively $sim0.7-1.0,(1.5-2.2)times10^{-4},M_odot$, $sim0.6-3.1,(1.4-6.3)times10^{-2},M_odot$, $sim1.0,(2.8)times10^{-4},M_odot$, $sim0.1-1.6,(0.3-3.3)times10^{-3},M_odot$, $sim1.0,(2.0)times10^{-3},M_odot$, and $sim 1.1,(2.9)times10^{-3},M_odot$, if the dust is graphite (silicate). The temperature of the graphite (silicate) dust of the six TDEs are respectively $sim1140-1430,(1210-1520)$,K, $sim1030-1380,(1100-1460)$,K, $sim1530,(1540)$,K, $sim960-1380,(1020-1420)$,K, $sim900,(950)$,K, and $sim1600,(1610)$,K. By comparing the derived temperatures to the vaporization temperature of graphite ($sim 1900$,K) and silicate ($sim 1100-1500$,K), we suggest that the IR excesses of PS18kh can be explained by both the graphite and silicate dust, the rest five TDEs favor the graphite dust while the silicate dust model cannot be excluded. Moreover, we demonstrate the lower limits of the radii of the dust shells surrounding the six TDEs are significantly larger than those of the radii of the photospheres at the first epochs of SEDs, indicating that the dust might exist before the the TDEs occurred. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.04115v1

Astro arXiv | all categories
Extension of HOPS Out to 500 ParSecs eHOPS I Identification and Modeling of Protostars in the Aquila Molecular Clouds

Astro arXiv | all categories

Play Episode Listen Later Sep 26, 2022 1:11


Extension of HOPS Out to 500 ParSecs eHOPS I Identification and Modeling of Protostars in the Aquila Molecular Clouds by Riwaj Pokhrel et al. on Monday 26 September We present a Spitzer/Herschel focused survey of the Aquila molecular clouds ($d sim 436$ pc) as part of the eHOPS (extension of HOPS Out to 500 ParSecs) census of nearby protostars. For every source detected in the Herschel/PACS bands, the eHOPS-Aquila catalog contains 1-850 $mu$m SEDs assembled from 2MASS, Spitzer, Herschel, WISE, and JCMT/SCUBA-2 data. Using a newly developed set of criteria, we classify objects by their SEDs as protostars, pre-ms sequence stars with disks, and galaxies. A total of 172 protostars are found in Aquila, tightly concentrated in the molecular filaments that thread the clouds. Of these, 72 (42%) are Class 0 protostars, 53 (31%) Class I protostars, 43 (25%) are flat-spectrum protostars, and 4 (2%) are Class II sources. Ten of the Class 0 protostars are young PACS Bright Red Sources similar to those discovered in Orion. We compare the SEDs to a grid of radiative transfer models to constrain the luminosities, envelope densities, and envelope masses of the protostars. A comparison of the eHOPS-Aquila to the HOPS protostars in Orion finds the protostellar luminosity functions are statistically indistinguishable, the bolometric temperatures/envelope masses of eHOPS-Aquila protostars are shifted to cooler temperatures/higher masses, and the eHOPS-Aquila protostars do not show the decline in luminosity with evolution found in Orion. We briefly discuss whether these differences are due to biases between the samples, diverging star formation histories, or the influence of environment on protostellar evolution. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.12090v1

Astro arXiv | all categories
The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 3

Astro arXiv | all categories

Play Episode Listen Later Sep 26, 2022 0:40


The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 3 by The Fermi-LAT collaboration et al. on Monday 26 September An incremental version of the fourth catalog of active galactic nuclei (AGNs) detected by the Fermi-Large Area Telescope is presented. This version (4LAC-DR3) derives from the third data release of the 4FGL catalog based on 12 years of E>50 MeV gamma-ray data, where the spectral parameters, spectral energy distributions (SEDs), yearly light curves, and associations have been updated for all sources. The new reported AGNs include 587 blazar candidates and four radio galaxies. We describe the properties of the new sample and outline changes affecting the previously published one. We also introduce two new parameters in this release, namely the peak energy of the SED high-energy component and the corresponding flux. These parameters allow an assessment of the Compton dominance, the ratio of the Inverse-Compton to the synchrotron peak luminosities, without relying on X-ray data. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.12070v1

Astro arXiv | all categories
Comparison of star formation histories of AGN and non-AGN galaxies

Astro arXiv | all categories

Play Episode Listen Later Sep 15, 2022 0:24


Comparison of star formation histories of AGN and non-AGN galaxies by G. Mountrichas et al. on Thursday 15 September We use AGN with $rm L_{X} sim 10^{42.5-44},erg,s^{-1}$, from the COSMOS-Legacy survey that lie within the UltraVISTA region and cross match them with the LEGA-C catalogue. The latter provides measurements of the calcium break, D$_n$4000, and H$_delta$ Balmer line that allow us to study the stellar populations of AGN and compare them with a galaxy reference catalogue. Our samples consist of 69 AGN and 2176 non-AGN systems, within $rm 0.6

Let's Go to Space: BLUE-SKY Learning
Episode 72: From Colombia to Space

Let's Go to Space: BLUE-SKY Learning

Play Episode Listen Later Jun 27, 2022 29:56


Today Kevin and I meet with Sara Alvarado who is a current economics and industrial engineering undergrad working towards her masters in Industrial Engineering at The University of Central Florida. In addition to her school load, Sara works at Universal Orlando Resort as an Industrial Engineer, Hailing from Colombia, she always dreamed big but knew her options were limited in her home country. The US has given her the career opportunities and the reach to empower many more to look up and imagine what could be, and she has kickstarted this by being the national chair of Students for the Exploration and Development of Space (SEDS). SEDS is a student-run non-profit that fosters the development of the interdisciplinary future leaders in space, with close to 100 chapters nationwide. This year Sara has taken a total of 18 students, with over half from Minority Serving Institutions, to the Satellite and ISDC conferences in Washington, DC where they have presented, networked, and even gotten internships on the spot. Sara sees her future job to be in space tourism, and is excited about helping many others become spectators of our blue dot. SmallSat Education Conference Aerospace and Innovation Academy --- Support this podcast: https://anchor.fm/shawna-christenson2/support

SPACE WAVEFORM
The Orbital Parameters | Episode: 3 | Space Waveform | SEDS KCT

SPACE WAVEFORM

Play Episode Listen Later Aug 28, 2021 4:55


✨In the previous episode we learnt about the Different types of orbits in which motion of the satellites take place.

Extinction Level Event
Energy Crisis

Extinction Level Event

Play Episode Listen Later Aug 23, 2021 13:05


In This Episode we discuss the Energy Crisis and the intricacies of that internal battle as well as looking at it in a more statistical way.https://yearbook.enerdata.net/total-energy/world-consumption-statistics.htmlhttps://www.businessinsider.com/this-is-the-potential-of-solar-power-2015-9https://www.eia.gov/energyexplained/us-energy-facts/https://www.eia.gov/electricity/annual/html/epa_07_04.htmlhttps://www.eia.gov/opendata/qb.php?category=40290&sdid=SEDS.NUETD.WI.Ahttps://blog.meltblowntechnologies.com/how-much-it-costs-to-clean-up-an-oil-spillhttps://www.quora.com/How-much-has-the-cleanup-of-the-Chernobyl-disaster-costhttps://blog.resourcewatch.org/2019/02/07/there-were-137-oil-spills-in-the-us-in-2018-see-where-they-happened/https://www.statista.com/statistics/494425/death-rate-worldwide-by-energy-source/https://www.carbonbrief.org/solar-wind-nuclear-amazingly-low-carbon-footprintsdarthmalius421@gmail.com

SSPI
Making Leaders featuring: University of Colorado Boulder - SEDS USA Team Competition 2nd Place Winners

SSPI

Play Episode Listen Later Jun 13, 2021 35:57


Space Strategy
A Far-Reaching Vision for Space

Space Strategy

Play Episode Listen Later Apr 15, 2021 109:14


In this episode, Senior Fellow in Defense Studies Peter Garretson interviews Rick Tumlinson, Founder of SpaceFund, EarthLight Foundation, New Worlds and Space Frontier Foundation. They discuss Rick's far-reaching vision for space, his current and past ventures as a founder, entrepreneur, activist, and now venture capitalist. Rick outlines the respective roles of government and private industry, and what policies are required to secure American leadership and develop the frontier. Rick Tumlinson: https://www.linkedin.com/in/ricktumlinson/ SpaceFund: https://spacefund.com/ Space Frontier Foundation: http://newspace.spacefrontier.org/ Earthlight Foundation: https://earthlightfoundation.org/ Space Studies Institute: https://ssi.org/ SEDS: https://seds.org/ New Worlds Conference: https://earthlightfoundation.org/newworlds/ ISDC Conference: https://isdc2021.nss.org/ Gerry O'Neill: https://thehighfrontiermovie.com/ High Frontier Book: https://www.amazon.com/High-Frontier-Human-Colonies-Apogee/dp/189652267X For questions and comments email: spacepod@afpc.org

Podcast Desenvolvimento Social SP
EP25. Participação feminina no setor público

Podcast Desenvolvimento Social SP

Play Episode Listen Later Mar 17, 2021 9:54


O aumento da inserção feminina no ambiente profissional, aliado aos movimentos feministas da pós-modernidade, trouxe um novo dinamismo às organizações. No campo organizacional a gestão pública talvez seja um caso exemplar. Essa evolução nos modelos gerenciais tem permitido que um número cada vez maior de mulheres ocupem espaços na política e na gerência de órgãos públicos, tornando-se mais propensas a assumir cargos de maior responsabilidade e exigência técnica. Neste episódio, conversamos com a servidora Roseli Vasconcelos, que atua na SEDS desde 1998, e vê uma evolução nos cargos de liderança ocupados por mulheres dentro do setor público nos últimos anos. Imperdível! Clique e ouça!

Sagres em OFF
#85: Lúcia Vânia cumpre última semana à frente da Seds e defende trabalho técnico realizado

Sagres em OFF

Play Episode Listen Later Mar 9, 2021 12:01


A Coluna Sagres em Off se dedica à cobertura dos bastidores das principais decisões e avaliações entre gestores, legisladores e influências no cenário goiano. Com apuração precisa da equipe de produtores e repórteres do Sistema Sagres, edição do colunista titular e pimenta na medida certa, a publicação apresenta o que está por trás das deliberações determinantes para a rotina de cidadãos e eleitores. A Coluna Sagres em Off é diária, no formato tradicional que cheira à tinta de jornal; em postagens de última hora, como no boletim ao vivo do rádio; ou em podcast para ouvir quando e onde quiser, com notícia e análise.

Podcast Desenvolvimento Social SP
EP22. Continuidade de políticas públicas

Podcast Desenvolvimento Social SP

Play Episode Listen Later Jan 26, 2021 13:15


No primeiro episódio de 2021, o podcast Desenvolvimento Social SP abordou a importância de se dar continuidade às políticas públicas durante as trocas administrativas de governos. Políticas públicas são um conjunto de projetos, programas e atividades complexas realizadas pelo Estado independente de quem seja o governante. Por isso, para que políticas exitosas não sejam interrompidas a cada 4 anos ou 8 anos, é necessário empenho político pela continuidade e engajamento da população. Sobre isso, conversamos com Rodrigo Flaire, coordenador de Gestão Estratégica da SEDS. Ouça:

Podcast Desenvolvimento Social SP
EP21. Os 20 anos do Bom Prato

Podcast Desenvolvimento Social SP

Play Episode Listen Later Dec 18, 2020 8:52


Um dos maiores programas de segurança alimentar do mundo comemora 20 anos. Com 260 milhões de refeições servidas desde 2000, o Bom Prato segue sendo referência de uma alimentação de qualidade por apenas R$ 1. Neste episódio, a Secretária de Desenvolvimento Social do Estado, Célia Parnes, fala sobre o orgulho que é poder comemorar a data em um momento em que o Bom Prato está em constante crescimento, servindo três refeições ao dia, parte delas gratuitamente, atendendo a demanda da população paulista neste momento de pandemia. Hoje, o programa conta com 59 restaurantes pelo estado e para explicar como tudo funciona, conversamos com Rita Dalmaso, coordenadora da Coordenadoria de Segurança Alimentar e Nutricional (COSAN). Este podcast marca uma série de comemorações que a SEDS está fazendo para celebrar as duas décadas de muito sucesso do programa, que serve diariamente a população do Estado de São Paulo.

Podcast Desenvolvimento Social SP
EP20. Residências Inclusivas para pessoas com deficiências

Podcast Desenvolvimento Social SP

Play Episode Listen Later Nov 30, 2020 8:29


As Residências Inclusivas são estruturas físicas adaptadas, adequadas e acolhedoras, para jovens e adultos com deficiência, em situação de dependência, que não disponham de condições de autossustentabilidade ou de retaguarda familiar. São pessoas que em algum momento da vida tiveram seus vínculos familiares rompidos. Seja por morte dos responsáveis, falta de condições financeiras ou de cuidado básico para a vida diária. As Residências Inclusivas têm o propósito de romper com isolamento da pessoa com deficiência, proporcionando a construção progressiva da autonomia e do protagonismo no desenvolvimento das atividades da vida diária. Neste episódio conversamos com Luciana Bolognini, especialista da Coordenadoria de Ação Social da SEDS, Roberto Franceschetti, coordenador da APAE de Bauru, que faz a gestão e administração de duas residências inclusivas na cidade, e Sandra Regina do Carmo, mãe de dois acolhidos. Ouça!

Techno Music - Techno Live Sets Podcast
SedsCast 013 (Extended 90 min set) by Chris Liebing

Techno Music - Techno Live Sets Podcast

Play Episode Listen Later Nov 27, 2020 90:39


Donate here👉 www.technols.com/donate The next Sedscast is 90 min extended set from the master Chris Liebing for his occasioned by this we spoke with him for his daily routine, electronic music, his career and connection with Greece. You can check also the Interview after enjoying the SedsCast on @Sedslifestyle IG account or on our Facebook page: SEDS! #ChrisLiebing […]

Podcast Desenvolvimento Social SP
EP19. Posto de Atendimento da SEDS no Poupatempo

Podcast Desenvolvimento Social SP

Play Episode Listen Later Nov 17, 2020 4:52


Há 15 anos, a Secretaria de Desenvolvimento Social do Estado de São Paulo (SEDS) tem um posto de atendimento presencial no Poupatempo de Itaquera, zona leste da capital. No local, o cidadão recebe orientações sobre programas sociais federais, estaduais e municipais. Além disso, são fornecidos modelos de declaração de pobreza, união estável, autorização para crianças e adolescente poderem viajar sem os responsáveis legais, orientação para obtenção de passes livre e para a locomoção de idosos no Capital, grande São Paulo e Interior, encaminhamento para orientação jurídica, entre outros serviços. Neste podcast conversamos com Patrícia Martins (foto), supervisora do posto de atendimento da SEDS no Poupatempo de Itaquera, sobre como funcionam os atendimentos e quais os serviços mais procurados pela população.

SEDScast
#25 Peter Diamandis

SEDScast

Play Episode Listen Later Oct 30, 2020 47:18


Peter Diamandis is an entrepreneur, engineer, physician, author, and so much more. He is a cofounder of SEDS, which is celebrating its 40th anniversary on October 30th, 2020. Peter joined us for a conversation on the founding of SEDS and his subsequent ventures. For Peter's full biography visit www.diamandis.com. Timestamps: 00:00 Founding SEDS 10:00 ISU 16:30 XPrize 26:00 COVAXX 34:00 Future of Space 42:30 Student Advice

This Amazing Story
Joalda Morancy – On the Path from Earth to Mars

This Amazing Story

Play Episode Listen Later Jul 27, 2020 51:18


Joalda Morancy is a Geosphysics, Astronomy and Astrophysics student at the University of Chicago. She just started an internship with NASA, and her goal is to become an astronaut, and one day walk on Mars.   Joalda is Director of Operations at Students for the Development and Exploration of Space, or SEDS USA. When she started college and realized that SEDS didn't have a chapter in Chicago, she started one - and she's also the president of the Chicago chapter.   On top of all that, she is also a science communicator. Joalda has a passion for inspiring low-income and disadvantaged kids in Chicago to see that anything is possible; that they don't need to believe in the limitations that other people have put on them.   In this episode, we talk about what inspired Joalda to pursue Astronomy. We look at the current and future state of Mars exploration, and what it will take to set up a permanent base on the red planet. And we also discuss some other awesome ideas for how humans might one day live in space. If you're not familiar with this sort of thing, some of it might seem pretty out there. But rest assured it's all based on science and within the realm of the possible.   SOME RELEVANT LINKS: Joalda Morancy Website: https://www.joalda.space/   Joalda Morancy on Twitter: https://twitter.com/solarrsystem   Students for the Exploration and Development of Space: https://seds.org/   NASA Jet Propulsion Laboratory: https://www.jpl.nasa.gov/   ECOSTRESS Project: https://ecostress.jpl.nasa.gov/   JPL Solar System Ambassadors: https://solarsystem.nasa.gov/solar-system-ambassadors/events/   ----more---- For more information or to join the conversation, visit thisamazingstory.com Or send mail to host, Malcolm McMillan. This Amazing Story on Facebook This Amazing Story on Twitter This Amazing Story on Instagram   "Episode 15. Joalda Morancy – On the Path from Earth to Mars" was produced by Malcolm McMillan for This Amazing Story. ©2020   This episode was recorded and produced on the unceded lands of the Squamish, Musqeum, and Tsleil-Waututh First Nations people.

Turnbuckle Turmoil
"The Duke of Dirtbags" Kevin Matthis joins SGWS

Turnbuckle Turmoil

Play Episode Listen Later Jul 17, 2020 58:00


We're joined by "The Duke of Dirtbags" Kevin Matthis. He has been embroiled in a feud at CPW with SEDS for some time now. Kevin has been working in the PNW for quite a while and is someone the fans there know quite well. We'll catch up with him and find out what he's doing these days and where he wants his career to go.

SEDScast
#10 Space Journalism with Jeff Foust

SEDScast

Play Episode Listen Later Jul 16, 2020 66:25


Jeff Foust is a distinguished space journalist and Senior Writer at SpaceNews. He has been covering the space industry as a journalist since the 1990s and has built an impressive portfolio of work over his career. Jeff holds an undergraduate degree in Geophysics from Caltech and a PhD in Planetary Sciences from MIT. Jeff also serves as a Board Advisor for SEDS USA! Timestamps: 02:35 SEDS 10:28 Early Career 21:24 SpaceNews and Journalism 43:15 Industry Discussion

SEDScast
#07 Making Spaceflight Accessible with Grant Bonin

SEDScast

Play Episode Listen Later Jul 2, 2020 66:43


Grant Bonin is the Senior Vice President of Business Development at Spaceflight Industries. SFI acts as an intermediary between launch providers and customers wishing to launch satellites. In this episode, Grant walks us through his time at Deep Space Industries, Rocket Lab, and SFI. We also talked through the recent acquisition of SFI by Mitsui, and how the company is continuing to improve space accessibility. Timestamps: 00:00 Introductions 5:48 SEDS & Education 15:56 Deep Space Industries 25:54 Rocket Lab 32:30 Spaceflight Industries 49:42 Student Questions and Advice

SEDScast
#05 Becoming a Space Doctor with Kris Lehnhardt

SEDScast

Play Episode Listen Later Jun 25, 2020 57:46


Kris Lehnhardt is a medical doctor working at NASA JSC in the Human Research Program. Kris leads the science side of the XMC team, which develops medical systems that enable future human exploration beyond low Earth orbit (LEO). In our discussion, we cover the fundamentals of designing human-rated spacecraft, how NASA has changed its approach over the years, and what we need to do to keep humans healthy when going beyond LEO for long durations. Timestamps: 00:00 Introductions 01:34 Education & SEDS 11:15 Space Medicine and Designing Spacecraft for Humans

Space4U
Rachel Lyons – Space for Humanity

Space4U

Play Episode Listen Later Jun 25, 2020 34:14


In this episode: We meet Rachel Lyons, Executive Director of Space for Humanity, a 501(c)(3) nonprofit organization with the mission of expanding access to space, training the leaders of tomorrow, and cultivating a movement towards a more harmonious world. Rachel is also a former public radio host, and the former Vice Chair of the Board of Directors for Students for the Exploration and Development of Space USA (SEDS), a nonprofit that empowers young people to make an impact in space exploration. She holds a bachelor’s degree in Aerospace, Aeronautical and Astronautical/Space Engineering from the University of Miami. In this conversation, Rachel discusses how, despite not having an early interest in space, she was inspired to pursue her chosen field of study in college, and the importance of SEDS and how it connects students to the space industry. She also explains the mission of Space for Humanity, its aspirations to get more people to experience what’s known as “the overview effect,” and their webinar series To Space, for Earth. Explaining her thoughts on Space for Humanity’s goals of diversity in space travel, Rachel says, “We need to actually live with that understanding that we all share this planet together. So, like I said, we’ll be sponsoring diverse people, not just that very small demographic, to have this experience.” To learn more about Space for Humanity, visit spaceforhumanity.org. Introductory and closing music: Paint the Sky by Hans Atom (c) copyright 2015 Licensed under a Creative Commons Attribution (3.0) license. http://dig.ccmixter.org/files/hansatom/50718 Ft: Miss Judged

SEDScast
#04 Redefining GEO with Ryan McLinko

SEDScast

Play Episode Listen Later Jun 22, 2020 63:51


Ryan McLinko is the cofounder and CTO at Astranis. Astranis develops small GEO communications satellites which provide internet to remote areas. Astranis is set to bring their first customer satellite online over Alaska by the summer of 2021. Ryan holds a bachelor's and master's degree in astronautics, both from MIT. He also serves on the SEDS USA Board of Advisors. Timestamps: 00:00 Introductions 03:10 Education & SEDS 24:33 Astranis 50:10 Student Questions

SEDScast
#02 Jack of All Space Trades with Will Pomerantz

SEDScast

Play Episode Listen Later Jun 11, 2020 85:31


Will Pomerantz is Vice President of Special Projects at Virgin Orbit. He is also a prominent figure within SEDS, serving as chair to the Board of Advisors and as a trustee to the endowment fund. In addition to those positions, Will co-founded the Brooke Owens Fellowship and remains deeply involved as an advisor and mentor. Timestamps: 00:00 Introductions 05:38 SEDS 17:23 Career 25:57 Virgin Galactic & Virgin Orbit 1:03:03 Brooke Owens Fellowship 1:13:25 Student Questions

On Orbit
Exploring Space Medicine With Dominic Tanzillo

On Orbit

Play Episode Listen Later Jun 8, 2020 29:35


What is space medicine? Although the answer can vary, it focuses on ways to keep humans in homeostasis while they endure extreme environments. There’s also ways that the space environment can benefit researchers studying diseases.  Dominic Tanzillo is an intern at NASA, a member of SEDS, as well as a mathematics and neuroscience student at Duke University. Although his NASA internship focuses on engineering, he’s interested in pursuing medical school. His interest led him to develop a space medicine course at Duke, which will be offered in the fall. In this episode, we talk to Dominic about the history of space medicine, what it encompasses, and what we can learn during the COVID-19 pandemic.

On Orbit
Making Space in the Space Industry With SEDS Director of Projects Nicole Chase

On Orbit

Play Episode Listen Later May 25, 2020 38:11


What does “space is for everyone” really mean? Nicole Chase tackles this question in her work. In order to make the space industry accessible for everyone, it’s important to understand what the phrase truly means.  A woman with many titles, Nicole is the Director of Projects for SEDS, Director of the Student Space Ambassador Program for The Mars Generation, and a Database Administrator for Made in Space. She recently submitted an abstract about the importance of young leadership in the space industry, and why it is crucial to foster an environment that young leaders thrive in. Additionally, she presented about the concept of “space is for everyone” at the SpaceUp Unconference and the Space Science in Context 2020 conference.  In this episode, we talk to Nicole about what “space is for everyone” means, how to foster young leadership, and how to make the industry an inclusive space (no pun intended) for all.

On Orbit
Launching Both CubeSats and Events With SEDS Rice President Ryan Udell

On Orbit

Play Episode Listen Later May 11, 2020 41:31


With the world around us constantly changing, next-generation space leadership is more important than ever. But, what does it mean? What does it look like?  SEDS Rice Chapter President Ryan Udell gives us an example of next-gen space leadership. An engineering major eager to connect his fellow students with the greater space industry, Ryan has taken it upon himself to revamp the SEDS chapter at his university, transforming the club from a single member to over 30! From there, he founded and hosted the inaugural Owls in Space Symposium event, which featured attendees such as NASA Administrator Jim Bridenstine and NASA astronaut Dr. Peggy Whitson. Additionally, he led Rice University’s entry in the NASA CubeSat launch initiative project, which was 1 of 18 winners to be launched into space.  In this episode, On Orbit talks to Ryan about the similarities and differences in leading (and launching) two very different projects, and what it takes to be a next-gen space leader.

On Orbit
On Orbit Live at SATELLITE — What Does “New Space” Really Mean?

On Orbit

Play Episode Listen Later Apr 6, 2020 64:47


The topic of this episode — our first live podcast — is more or less a question. What exactly do we, people in the space and satellite industry, mean when we use the term 'New Space'? New Space is often used to describe new companies, new ideas, and new technologies. Is New Space a technical term? Or, is it a cultural identity? This episode was recorded during the SATELLITE 2020 show in Washington D.C., and it’s co-hosted by our good friends Grace Graham (Brooke Owens Fellow, Utah State University, Via Satellite contributor) and Brian Garret-Glazer (Avionics Magazine). Our special guest panelists are Dr. Tanya Harrison (Planet), Charlie Nitschelm (Students for the Exploration and Development of Space — SEDS), Rafferty Jackson (Jack Industries, Astia) and Ali Younis (Astranis). Via Satellite also covered the panel during SATELLITE.  We’d like to thank Charlie and SEDS for sponsoring this episode. SEDS is a non-profit that empowers young people to participate and make an impact in space exploration. Visit SEDS’ website for more information about how you can join or volunteer for SEDS and their many causes and events throughout the year.  Finally, the Via Satellite team would like to send our best wishes to all of our listeners as we deal with this global health crisis. We hope all of you stay safe and healthy, and we also thank you for listening to this podcast. We may be stuck inside, but thanks to modern technology, we can still talk to people all around the world. So, if you have an idea for an episode, or are interested in participating in a discussion, please follow us and message us on Twitter (@OnOrbitPodcast). Enjoy the show!

On Orbit
The Songs (and Sounds) of Space with Steven Drozd & The Flaming Lips

On Orbit

Play Episode Listen Later Mar 23, 2020 52:01


And now for something completely different! Steven Drozd, multi-instrumentalist and songwriter with the world-famous Oklahoma City-based rock band, The Flaming Lips joins us on On Orbit for a discussion about how space and technology has influenced not only his music, but of the music of a generation. Over the course of their nearly 37-year existence, the Flaming Lips have drawn inspiration for their music from the most fascinating and unique corners of science fiction, as well as some of the most important moments in space exploration history. Steven talks about how the NASA Moon landing, Voyager program, Mars mission, visual artist Moebius, David Bowie, the films “2001: A Space Odyssey” and “Logan’s Run,” and composers Gustav Holst, György Ligeti, and Igor Stravinsky all helped shape the Flaming Lips’ signature sound. We even discuss the musical instruments and tools that Steven used to recreate the space environments in his songs.  Escape the daily pandemic news for a moment and enjoy this conversation about the songs and sounds of space! This episode also features samples of Flaming Lips songs, which are available through Warner Brothers, on all streaming services, online and retail record stores. The band’s new album, American Head, will be released this summer. For more information on the band, visit flaminglips.com.  This episode of On Orbit is sponsored by the Students for the Exploration and Development of Space (or SEDS). SEDS is a non-profit that empowers young people to participate and make an impact in space exploration. Thank you so much to SEDS and all of their members for supporting this episode of On Orbit.

科技不怕问
疫情之下如何复工复产?原来背后有这些人!

科技不怕问

Play Episode Listen Later Feb 26, 2020 7:25


微信"siemensfm1847",加入听友群,发现更多精彩!咨询西门子业务,请拨打400-616-2020疫情之下,有人逆行而上,也有人默默守护。在我们身边就不乏无惧挑战、坚守岗位的西家小伙伴。他们的故事温暖而有力量,让我们在特殊时期里少一丝不安,多一分坚定。跨越山海,紧急支援William Eldh和Zoltan Kerekgyarto是来自瑞典和匈牙利的服务工程师。自疫情发生以来,他们一直在渤海湾西部海域的曹妃甸11-6海洋石油平台上值守,负责3台SGT-700 燃气轮机的维护保运任务,保障客户的天然气开采和输送,应对春节用气高峰。他们在春节前夕登上海洋石油平台。疫情爆发之后,西门子和客户把人员安全放在第一位,一致决定隔绝平台与陆地的一切往来!原本与平台通勤的直升机和轮渡全部取消。这也意味着两位工程师必须独自面对挑战,利用有限的资源解决问题。▲William Eldh(左)和Zoltan Kerekgyarto(右)在疫情期间值守曹妃甸11-6海洋石油平台。 根据客户的防疫要求,后续人员需要在隔离满14天之后才能登上平台工作。在接班人员无法及时到岗的情况下,两位工程师不得不延长服务期限,在海上坚守岗位。由于其他工作安排,William于2月9日离开了平台。而在这之后,Zoltan一人扛起压力,继续完成任务。其实,在赶赴天津之前,William才刚刚完成一个广州项目的安装服务工作,原本计划于1月中旬返回瑞典。面对客户的紧急需求,他果断放弃回国计划,立刻赶往客户现场。“我们只是在尽力完成工作。希望疫情快点过去,希望在中国的西门子人都健康!”William说道。客户和合作伙伴称赞西门子团队在紧要关头恪尽职守的敬业精神。哈尔滨广瀚燃机项目经理王巍说:“通过这次节日保运,我们能深刻地体会到西门子急客户所急,想客户所想的服务理念。西门子是我们值得信赖的合作伙伴!”临危受命,勇担责任由于突发疫情, 西门子(上海)电气传动设备有限公司(SEDS)的一位售后服务工程师在湖北家中隔离,无法前往山东莱芜的客户现场进行变频器调试。项目紧急,公司马上重新安排人员,售后服务工程师于合聚临危受命。当时正在山东老家过春节的他没有丝毫犹豫和推脱,立刻接下任务,并利用春节假期熟悉技术资料,提前做好准备工作。于合聚在节后第一时间奔赴客户现场。受疫情影响,山东省内多处高速路段管制,原本160公里的路程竟然走了430公里,足足用了7个小时!到达莱芜后,他按照客户防疫防控要求在酒店自行隔离。2月6日,于合聚终于进入客户现场,一大早便马不停蹄地推进调试准备工作,包括敷设主电缆和控制电缆、校验电缆表等等。 “客户信任我们,需要我们,我们在特殊时期也要克服困难,尽力做到最好!”他说。▲完成自我隔离后,于合聚进入项目现场,支持客户调试工作。防疫为先,客户至上2月8日,油气与电力集团过程工业解决方案事业部(GP SLN)的团队收到战略合作伙伴中集来福士深水养殖工船 Havfarm 1# 项目的紧急复工请求。项目经理第一时间上报管理层和EHS部门,大家召开紧急会议。本着安全第一的原则,在充分了解当地政府及船厂的防疫要求和举措,分析现场安全服务的可行性之后,EHS出具了详细的现场服务人员防疫安全指引。2月9日下午,家住烟台附近的GP SLN服务工程师田绪敬收到了第二天到达客户现场调试的通知。根据防疫指南,他准备好必要的防护装备,第二天一早就告别家人出发了。为了最大程度防范风险,他决定自己开车往返现场,尽量减少与外界接触。临行前,管理层特意叮嘱他:“你是我们整个SLN中国第一个开工的勇士,向你致敬!一定要在确保安全的情况下开始工作,若有困难要及时反映,保护好自己 !”▲田绪敬在进行现场设备的检查。疫情当前,西门子与客户同在。GP SLN项目团队将助力这一世界上最大最先进的养殖工船更好更快地交付!智能防疫,安全出行春节期间,广东珠海的项目现场穿梭着智能交通人忙碌的身影。为了配合客户在疫情期间的重要任务,西门子交通中国的宋思佳、沈剑秋、方健愉、刘锴和陈学诚放弃了假期,在前方为珠海市民的安全出行保驾护航。其中,老家在武汉的沈剑秋还要承受着对家人朋友的无尽挂念和担忧,克服困难,尽职尽责地开展工作。▲西门子交通团队在春节期间坚守前线工作。疫情蔓延的速度超出了所有人的想象,也给珠海道路交通的安全运行带来了前所未有的挑战。关键时刻,身负重托的交通人没有辜负客户的期望,他们充分利用西门子的智能交通管理平台,在实时监控的基础上不断创新,针对客户的特殊需求,给出了及时有效的定制化解决方案。同时,面对紧急的突发状况,工程师们火速奔赴现场,为急需救治的危重病人争取宝贵的时间。▲西门子智能交通管理平台助力珠海交通应对防疫期间的挑战。

科技不怕问
疫情之下如何复工复产?原来背后有这些人!

科技不怕问

Play Episode Listen Later Feb 26, 2020 7:25


微信"siemensfm1847",加入听友群,发现更多精彩!咨询西门子业务,请拨打400-616-2020疫情之下,有人逆行而上,也有人默默守护。在我们身边就不乏无惧挑战、坚守岗位的西家小伙伴。他们的故事温暖而有力量,让我们在特殊时期里少一丝不安,多一分坚定。跨越山海,紧急支援William Eldh和Zoltan Kerekgyarto是来自瑞典和匈牙利的服务工程师。自疫情发生以来,他们一直在渤海湾西部海域的曹妃甸11-6海洋石油平台上值守,负责3台SGT-700 燃气轮机的维护保运任务,保障客户的天然气开采和输送,应对春节用气高峰。他们在春节前夕登上海洋石油平台。疫情爆发之后,西门子和客户把人员安全放在第一位,一致决定隔绝平台与陆地的一切往来!原本与平台通勤的直升机和轮渡全部取消。这也意味着两位工程师必须独自面对挑战,利用有限的资源解决问题。▲William Eldh(左)和Zoltan Kerekgyarto(右)在疫情期间值守曹妃甸11-6海洋石油平台。 根据客户的防疫要求,后续人员需要在隔离满14天之后才能登上平台工作。在接班人员无法及时到岗的情况下,两位工程师不得不延长服务期限,在海上坚守岗位。由于其他工作安排,William于2月9日离开了平台。而在这之后,Zoltan一人扛起压力,继续完成任务。其实,在赶赴天津之前,William才刚刚完成一个广州项目的安装服务工作,原本计划于1月中旬返回瑞典。面对客户的紧急需求,他果断放弃回国计划,立刻赶往客户现场。“我们只是在尽力完成工作。希望疫情快点过去,希望在中国的西门子人都健康!”William说道。客户和合作伙伴称赞西门子团队在紧要关头恪尽职守的敬业精神。哈尔滨广瀚燃机项目经理王巍说:“通过这次节日保运,我们能深刻地体会到西门子急客户所急,想客户所想的服务理念。西门子是我们值得信赖的合作伙伴!”临危受命,勇担责任由于突发疫情, 西门子(上海)电气传动设备有限公司(SEDS)的一位售后服务工程师在湖北家中隔离,无法前往山东莱芜的客户现场进行变频器调试。项目紧急,公司马上重新安排人员,售后服务工程师于合聚临危受命。当时正在山东老家过春节的他没有丝毫犹豫和推脱,立刻接下任务,并利用春节假期熟悉技术资料,提前做好准备工作。于合聚在节后第一时间奔赴客户现场。受疫情影响,山东省内多处高速路段管制,原本160公里的路程竟然走了430公里,足足用了7个小时!到达莱芜后,他按照客户防疫防控要求在酒店自行隔离。2月6日,于合聚终于进入客户现场,一大早便马不停蹄地推进调试准备工作,包括敷设主电缆和控制电缆、校验电缆表等等。 “客户信任我们,需要我们,我们在特殊时期也要克服困难,尽力做到最好!”他说。▲完成自我隔离后,于合聚进入项目现场,支持客户调试工作。防疫为先,客户至上2月8日,油气与电力集团过程工业解决方案事业部(GP SLN)的团队收到战略合作伙伴中集来福士深水养殖工船 Havfarm 1# 项目的紧急复工请求。项目经理第一时间上报管理层和EHS部门,大家召开紧急会议。本着安全第一的原则,在充分了解当地政府及船厂的防疫要求和举措,分析现场安全服务的可行性之后,EHS出具了详细的现场服务人员防疫安全指引。2月9日下午,家住烟台附近的GP SLN服务工程师田绪敬收到了第二天到达客户现场调试的通知。根据防疫指南,他准备好必要的防护装备,第二天一早就告别家人出发了。为了最大程度防范风险,他决定自己开车往返现场,尽量减少与外界接触。临行前,管理层特意叮嘱他:“你是我们整个SLN中国第一个开工的勇士,向你致敬!一定要在确保安全的情况下开始工作,若有困难要及时反映,保护好自己 !”▲田绪敬在进行现场设备的检查。疫情当前,西门子与客户同在。GP SLN项目团队将助力这一世界上最大最先进的养殖工船更好更快地交付!智能防疫,安全出行春节期间,广东珠海的项目现场穿梭着智能交通人忙碌的身影。为了配合客户在疫情期间的重要任务,西门子交通中国的宋思佳、沈剑秋、方健愉、刘锴和陈学诚放弃了假期,在前方为珠海市民的安全出行保驾护航。其中,老家在武汉的沈剑秋还要承受着对家人朋友的无尽挂念和担忧,克服困难,尽职尽责地开展工作。▲西门子交通团队在春节期间坚守前线工作。疫情蔓延的速度超出了所有人的想象,也给珠海道路交通的安全运行带来了前所未有的挑战。关键时刻,身负重托的交通人没有辜负客户的期望,他们充分利用西门子的智能交通管理平台,在实时监控的基础上不断创新,针对客户的特殊需求,给出了及时有效的定制化解决方案。同时,面对紧急的突发状况,工程师们火速奔赴现场,为急需救治的危重病人争取宝贵的时间。▲西门子智能交通管理平台助力珠海交通应对防疫期间的挑战。


Dr. Wells, DC discusses with Dr. Fritz Huber, PhD, (Chair of the Health, Leisure, and Sports Sciences Department at Oral Roberts University) the subject of health and wellness. This is a part one of a two part series with Dr. Huber. Dr. Huber mentions in his book, Essential of Physical Activity, that people are increasingly becoming health conscious and are seeking knowledge about sound health practices.The Current Health Search:Of the books on the weekly Top Ten best selling list, often two or three are health-related books, usually singing the praises of some new diet.In 1982, an estimated $50 million was spent in the United States on diet, exercise and health books compared to over $1 billion in 2013.The National Sporting Goods Association reported in 2014, Americans spent $60 billion on sport equipment ( e.g. stationary bikes, weight training equipment, golf, etc.). Additionally, $20 billion was spent on nutritional supplements and over $17.6 billion on health club memberships. If you combine all expenditures on fitness, sports and leisure areas, Americans spend more than $330 billion per year.Dr. Huber closes with a statement that is so true not only in my chiropractic office but in a lot of health care providers offices as well. The present consensuses of the allied health professions place the burden of health in the hands of the individual, making it each person's responsibility to adopt a healthy lifestyle.Dr. Huber and I look at "Sedentary Environmental Death Syndrome (SeDS) coined by Professor Frank Boot. Research evidence reveals the following: SeDS will cause 2.5 million Americans to die prematurely in the next decade. SeDS will cost $2-$3 trillion in healthcare expenses in the United States in the next decade. Chronic disease have increased because of physical inactivity. In the United States, type 2 diabetes (adult onset) has increased nine fold since 1958, obesity has doubled since 1980 and heart disease remains the number one cause of death. United States children are now getting SeDS-related diseases-they are increasingly overweight, showing fatty streaks in their arteries, and developing type 2 diabetes, a disease formerly restricted to adults.Additionally, Dr. Huber and I look at "health" from two different perspectives, a worldview perspective and the other, a biblical and christian perspective. A biblical definition of "wholeness" (source: www.faithandhealthconnection.org) is defined as the state of being perfectly well in body, soul (mind, will and emotions) and spirit. Dr. Huber discusses "Whole Person Education" at Oral Roberts University.Dr. Huber and I discuss how our society used the words "health" and "wellness" interchangeably, but they differ in two important ways. Health can be determined or influence by factors beyond our control, such as our genes, age, and family history. Whereas, "wellness" is determined largely by the conscious decisions we make about how we live. These decisions affect the risk factors, a condition that increases your chances o fdisease or injury. We cannot control our age or family history, but we can control lifestyle behaviors. (Connect Core Concepts in Health by Insel, Roth & Insel).Support the show (https://www.patreon.com/SoaringInHealthandWellness)

The Orbital Mechanics Podcast
Episode 205: DOWNLINK--SEDS UCF IREC III

The Orbital Mechanics Podcast

Play Episode Listen Later Apr 9, 2019 64:31


This week in SF history— April 9, 1959, Mercury 7 announced (wikipedia.org)Spaceflight news— Beresheet enters orbit (spacenews.com) — Landing details (technology.spaceil.com)Short & Sweet— Starliner gets delayed once again. (spaceflightnow.com) (spacenews.com) (nasaspaceflight.com)— Hayabusa2 impactor successfully strikes asteroid’s surface (sciencenews.org) (planetary.org)— Starhopper hops (spacenews.com)Interview -- SEDS UCF IREC— Thanks to Pedro for coordinating this interview!— Thanks also to the team members who took the time to talk to us: — Ben S. - Electronics lead — Alec - Propulsion lead — Ryan - Airframe Lead — Tyler - Project Manager— Fundraising (gofundme.com)— IREC 2019 promo (youtube.com)— twitter.com/irectempest— instagram.com/sedsucf— twitter.com/sedsucf

Turnbuckle Turmoil
Seds joins Turnbuckle Turmoil

Turnbuckle Turmoil

Play Episode Listen Later Dec 23, 2018 58:00


Seds makes his way to Turnbuckle Turmoil for the first ever time. He is no stranger to fans of wrestling on the west coast. Seds wrestled a lot against some top people in California before making his way to Washington. He has wrestled for 321 Battle and SSP. He's also become part owner of CPW where there is pandemonium in the office. Often taking part in Seds Rules types of matches, he is often putting his body on the line in some brutal matches. We'll talk to him and learn more about him and his goals.

The Beardy 5
"Seds" Birthday Post

The Beardy 5

Play Episode Listen Later Sep 28, 2018 47:21


Welcome Back, this week Sid and Jess kick is old school and bs about selfies, birthday posts, and if Thomas Jefferson would hit on the girls of the Jersey Shore.We hope you enjoy! STAY BEARDY

The Orbital Mechanics Podcast
Episode 138: DOWNLINK--SEDS UCF IREC II

The Orbital Mechanics Podcast

Play Episode Listen Later Dec 19, 2017 56:25


Students for the Exploration and Development of Space has a chapter at University of Central Florida, and they've entered the Intercollegiate Rocket Engineering Competition. They had a successful failure last year, and now they're here to talk about their run up for next year.

Lend Me Your Engineers
Lend Me Your Engineers Podcast: Episode #4

Lend Me Your Engineers

Play Episode Listen Later Oct 9, 2017


On this episode of Lend Me Your Engineers, Paul and Kamryn sit down with Sumayya, the President of SEDS at UCF. Sumayya earned the inaugural Brooke Owens Fellowship, allowing her to spend the summer in Washington D.C. at Orbital ATK. She was mentored by Ellen Stofan, former Chief Scientist at NASA. If you [...] The post Lend Me Your Engineers Podcast: Episode #4 appeared first on UCF MAE.

The Orbital Mechanics Podcast
Episode 105: DOWNLINK--SEDS UCF IREC

The Orbital Mechanics Podcast

Play Episode Listen Later Apr 18, 2017 78:17


In a rocket building competition, you can only back one team, and we made our choice. Also, 3D printed combustion chambers and on-orbit window replacements!

Bridging the Gap Podcast
Preparing to Take the Field: A Temporal Exploration of Stress, Emotion, and Coping in Elite Cricket

Bridging the Gap Podcast

Play Episode Listen Later Jan 16, 2017 44:52


Study: Preparing to Take the Field: A Temporal Exploration of Stress, Emotion, and Coping in Elite Cricket Abstract: The purpose of this study was to explore the stress, emotion, and coping (SEC) experiences of elite cricketers leading up to and on the day of their first competitive fixture of the season. Four elite male cricketers (M = 21.25, SD = 1.5) completed Stress and Emotion Diaries (SEDs) for the 7-day period leading up to and on the day of their first competitive fixture of the season. We then interviewed the cricketers to explore the content of the SEDs in more detail. We used semistructured interviews to glean insight into the stressors, cognitions, emotions, coping strategies, and behaviors. Inductive and deductive content data analysis provided a holistic and temporal exploration of the SEC process underpinned by the cognitive-motivational-relational theory of emotions (Lazarus, 1999). The results highlighted the ongoing and continuous nature of the SEC process while illustrating the coping strategies the cricketers used leading up to and on the day of competition.   Author: Adam Miles Adam Miles is a PhD candidate in Sport Psychology at the School of Physical Education, Sport and Exercise Sciences, University of Otago, New Zealand. His research focuses primarily on the psychosocial effects of participation in sport. In particular, his current research involves developing, implementing, and evaluating the effectiveness of a life skills intervention with elite athletes. He has also investigated issues such as stress, emotion, and coping in elite sport and the mediating effects of self-talk during skilled motor performance. Links:   Study: http://journals.humankinetics.com/doi/abs/10.1123/tsp.2014-0142   Author: http://www.otago.ac.nz/sopeses/staff/postgraduate/adam_miles.html

Conference Calls -168143

Suzanne Griffin, Nina Anderson, Tammy Nicholls

seds nina anderson
Security, Mobile & Cloud - Caleb Barlow
Data at Risk - Is there a weakness in self-encrypting hard drives?

Security, Mobile & Cloud - Caleb Barlow

Play Episode Listen Later Jan 5, 2016 30:30


Self-encrypting hard drives (SEDs) have been dubbed the security industry’s best-kept secret, but is the data inside really secure?With its ability to accelerate the drive-redeployment process, SEDs have been rising in popularity. Tune into this podcast to hear Rick Robinson, IBM Security Product Manager of Data Security, examine the security behind self-encrypting hard drives and some new-found security vulnerabilities that have recently been disclosed with SEDs.

Security, Mobile & Cloud - Caleb Barlow
Data at Risk - Is there a weakness in self-encrypting hard drives?

Security, Mobile & Cloud - Caleb Barlow

Play Episode Listen Later Jan 5, 2016 30:30


Self-encrypting hard drives (SEDs) have been dubbed the security industry’s best-kept secret, but is the data inside really secure?With its ability to accelerate the drive-redeployment process, SEDs have been rising in popularity. Tune into this podcast to hear Rick Robinson, IBM Security Product Manager of Data Security, examine the security behind self-encrypting hard drives and some new-found security vulnerabilities that have recently been disclosed with SEDs.

Fakultät für Physik - Digitale Hochschulschriften der LMU - Teil 05/05

Active Galactic Nuclei (AGN) are the accreting super massive black hole (SMBH) at the center of massive galaxies. The tight M-σ and M_BH-M_bulge correlations reveal that the host galaxies are affected by the effects of the SMBHs. In addition, many works studying on the rest-frame color-magnitude relation have shown that AGN host galaxies have intermediate colors, which are considered as a transition from the blue cloud to red sequence in host-galaxy color evolution. Some works interpreted this result as an evidence for the AGN feedback, in the sense that the accretion process not only builds up the massive black holes, but also has a powerful influence on the surrounding environment, triggering or suppressing the star-forming activity in the host galaxy. These correlations make obvious the need to investigate AGN-host coevolution. One way to understand this coevolution is to study the AGN duty cycle (i.e., the time scale that the SMBH is active), which can be obtained by estimating AGN population among all the galaxies through cosmic times. Such demographic studies require a well-sampled census and accurate redshift information. In particular at high redshift, objects are extremely faint and sample numbers are very small. This could cause large statistical errors. For example, Aird et al. (2010) argued that luminosity-dependent density evolution with a flattening faint-end slope of the X-ray luminosity function (XLF) at z > 1.2 may result from catastrophic photo-z failures caused by observational limitations and improper templates used for photo-z computation. However, spectroscopic redshifts are time-consuming and difficult to be obtained for faint sources at high redshifts. Therefore we have to rely on photometric redshifts (photo-z) techniques which need to be tuned specifically to be reliable for AGNs (i.e., proper magnitude priors, appropriate AGN-galaxy hybrid template for SED-fitting, and correct multi-wavelength counterparts). In recent years, many deep and high-resolution observations become available in multiple wavebands, specially at near/mid-infrared. This allows us to reach higher redshift, and make more accurate analysis on the multi-wavelength properties of AGNs. In this thesis, we focus on the ECDFS area which comprise also the GOODS-S and CDFS regions. This is the portion of the sky with the deepest and most complete photometric information from X-ray to radio, including intermediate bands from the Subaru telescope, and optical/near-infrared data from the Hubble space telescope. To compute accurate photo-z using these data, first we combined multi-wavelength catalogs from UV to infrared after the astrometric calibration and correction for the different methods of flux extraction (e.g., total fluxes, flux apertures and PSF- fitted photometry). Second we identified the best multi-wavelength counterparts for X-ray sources from the 4Ms-CDFS and 250ks-ECDFS surveys, taking into account the positional errors and multiple magnitude distributions as priors simultaneously. We found that more then 96% of X-ray sources have multi-wavelength counterparts. Thirdly we built a new library of active galactic nuclei/galaxy hybrid templates appropriate for the faint X-ray population in the CDFS to simulate the AGN spectral energy distribution from low to high redshift. For X-ray-selected AGNs, we achieved a photo-z accuracy of 0.013 with an outliers fraction of 5.3%, while for non-X-ray galaxies, the photo-z accuracy is 0.010 with an outlier fraction of 4.6%. With the SED-fitting results of our well-trained AGN-galaxy hybrids, we further studied the galaxy and AGN host properties via the rest-frame color-magnitude diagram (CMD) which is an useful probe to trace the stellar populations. We made corrections for dust extinction and/or AGN contamination for the galaxy/AGN host colors in the CANDELS/GOODS-S region. We found that the AGN host colors also present bimodality in the CMD up to z~2.5 as found in normal galaxies, and the position of the blue peaks in the AGN samples are almost constant with cosmic time. This implies a weak connection between AGN activity and star formation in the host galaxy. For the X-ray sources in the 4Ms-CDFS survey, we found that for most of the sources, the correction for dust extinction is larger than the correction for the AGN contribution. This is because the AGN population in this field is dominated by low-luminosity AGNs which have host-dominated SEDs. However for few bright sources, their host colors are strongly effected by AGN contribution rather than by the dust extinction. For these sources, the correction for AGN contribution is about two times larger than the correction for dust extinction in general. Therefore AGN/galaxy decomposition becomes more important in a shallower and wider X-ray surveys, e.g., XMM-COSMOS and eROSITA, which contains a larger fraction of bright AGNs. Furthermore, with our accurate redshifts for galaxies and AGNs, we defined a high-redshift (high-z) sample using the redshift probability distribution function P(z) rather than relying on the best-fit value of photo-z. We integrated P(z) within a given redshift range to obtain the photo-z probability in that range and selected high-z sources above a given threshold. When computing the number of sources in a given redshift range, each source will not be counted as "1" but as the proportion of it. We compared this P(z) technique with traditional color techniques adopted for galaxy evolutionary stages, like the Lyman break galaxy and the BzK color-color selection via sample completeness and purity. We found that the P(z) technique is the most efficient and reliable method for selecting high-z sources. This is not surprising as it makes use of photometric information from the entire SED rather than using only three photometric points. Lastly, we built a high-z (z > 3) sources list for X-ray sources in ECDFS region, and compared our list with previous work. In our work, we made better X-ray-to-optical/NIR associations considering the positional errors and magnitude distribution. In addition, we obtained accurate photo-z using well-established AGN-galaxy hybrids for X-ray selected AGNs and applied P(z) for each source. These procedures help improving on our high-z sample selection.

Fakultät für Physik - Digitale Hochschulschriften der LMU - Teil 05/05
Photometric redshifts and properties of galaxies from the sloan digital sky survey

Fakultät für Physik - Digitale Hochschulschriften der LMU - Teil 05/05

Play Episode Listen Later Feb 25, 2015


The determination of photometric redshifts is essential for many subjects in cosmology and extragalactic astronomy, like the large scale structure of the Universe, gravitational lensing, or galaxy evolution. If the spectral energy distribution (SED) of a galaxy is measured with high enough spectral resolution, the redshift can be easily derived through the absorption and emission lines which are created by the elements in the galaxy. However, currently more telescopes are equipped with large cameras with charged coupled devices (CCDs) that observe the sky through optical filters. With these photometric observations it is possible to detect much fainter astronomical objects than with spectroscopy. Furthermore, photometric observations are less time consuming and cheaper in comparison, wherefore they are preferentially used for observations of statistical meaningful cosmological volumes. Nonetheless, photometric data, which are often gained by observations through broadband filters, are not as precisely resolved as spectra. Therefore one does not have information about the accurate position in wavelength of spectral lines, but only about the overall shape of the SED. This is the reason why so-called photometric redshifts have to be derived by statistical means. One approach to estimate the redshift through photometry alone are template fitting methods which compare the fluxes predicted by model spectra with the observations. After that, a likelihood analysis is performed with which a probability density function P(z) and the most probable value of z can be derived. To achieve high accuracies with photometric redshift template fitting techniques, the model spectra as well as their corresponding prior probabilities have to be chosen carefully. In this work I use photometric and spectroscopic data of luminous red galaxies from the Sloan Digital Sky Survey (SDSS). I analyze the precision of photometric redshifts estimated with model SEDs specifically designed to match the set of luminous red galaxies of SDSS-II at redshifts z ≤ 0.5 in color and I compare them with published results. These models were created without information on their properties at wavelengths shorter than the SDSS u band. However, the galaxy UV characteristics derived from the model SEDs match those of other observations. Furthermore, I investigate the SED properties derived from the best fitting models with respect to spectroscopic data as functions of redshift and luminosity. At lower redshifts less luminous galaxies from our sample on average show increased signs of star formation in comparison to galaxies with higher luminosities. This is supported by analyses of the line strengths in the spectra. Moreover, star formation activity increases with increasing redshift which is caused by the aging of the galaxy population from higher to lower redshifts. I also generate model spectra for red galaxies from the SDSS-III located at even higher redshifts 0.45 ≤ z ≤ 0.9. For this I modify the shape of theoretical spectra to match the data of the analyzed galaxies to a better extent. The multidimensional space defined by the colors and the absolute magnitude of the galaxies is reduced to two dimensions through a self-organizing map. The map is then partitioned by a k-means algorithm which identifies clusters in the data. From the cluster cells I select model spectra which represent the galaxies from within the same cell. A selection of the models is then used as a template set for photometric redshift estimation. I find that our models improve the redshift accuracy in comparison to the results published by SDSS.

Fakultät für Physik - Digitale Hochschulschriften der LMU - Teil 05/05
Multi-frequency study on markarian 421 during the first two years of operation of the MAGIC stereo telescopes

Fakultät für Physik - Digitale Hochschulschriften der LMU - Teil 05/05

Play Episode Listen Later Sep 22, 2014


Markarian 421 (Mrk~421) is one of the classical blazars at X-ray and very high energies (VHE; $>$100 GeV). Its spectral energy distribution (SED) can be accurately characterized by current instruments because of its close proximity, which makes Mrk~421 one of the best sources to study the nature of blazars. The goal of this PhD thesis is to better understand the mechanisms responsible for the broadband emission and the temporal evolution of Mrk~421. The results might be applied to other blazars which cannot be studied with this level of detail because their emissions are weaker, or they are located further away. This thesis reports results from $sim$70 hours of observations with MAGIC in 2010 and 2011 (the first two years of the operation of the MAGIC stereo telescopes), as well as the results from the multi-wavelength (MW) observation campaigns in 2010 and 2011, where more than 20 instruments participated, covering energies from radio to VHE. The MW data from the 2010 and 2011 campaigns show that, for both years, the fractional variability $F_{rm var}$ increases with the energy for both the low-energy and the high-energy bumps in the SED of Mrk~421. Furthermore, $F_{rm var}(text{optical})$ was similar to $F_{rm var}(text{HE-$gamma$-ray;$>$100 MeV})$, and $F_{rm var}(text{X-ray})$ was similar to $F_{rm var}(text{VHE-$gamma$-ray})$. This observed characteristic is expected from the strong correlation between the synchrotron photons and the up-scattered photons by inverse-Compton effect within the synchrotron self-Compton (SSC) emission model, thus allowing for the first time of the consistency test on this widely used theoretical model. During the MW campaign in 2010, we measured the decay of a flaring activity during 13 days in March. We could perform MW observations every day, which enables an unprecedented characterization of the time-evolution of the radio to $gamma$-ray emission of Mrk~421. The broadband SEDs during this flaring episode, resolved on timescales of one day, were characterized with two leptonic scenarios: a one-zone SSC model, and a two-zone SSC model where one zone is responsible for the quiescent emission while the other (smaller) zone, which is spatially separated from the former one, contributes to the daily-variable emission occurring mostly at X-rays and VHE $gamma$ rays. Both the one-zone SSC and the two-zone SSC models can describe the daily SEDs. However, the two-zone SSC model provides a better agreement to the observed SED at the narrow peaks of the low- and high-energy bumps during the highest activity. The proposed two-zone scenario would naturally lead to the correlated variability in the X-ray and VHE bands without variability in the optical/UV band, as well as to shorter timescales for the variability in the X-ray and VHE bands with respect to the variability in the other bands. This concept of a second small emission region containing a narrow electron spectrum in order to explain the short timescale flaring activity in the X-ray and VHE bands could be generalized to other blazars. The results from the 2010 March flaring activity of Mrk~421 are reported in Sections~ref{LightCurves} -- ref{Discussion}, and they are the main scientific achievement of this PhD thesis. Preliminary results were reported (as an oral contribution) in the 33rd International Cosmic Ray Conference (Rio de Janeiro, July 2013), one of the most prestigious conferences in the field of the VHE astronomy and astro-particle physics in general. The final results (reviewed and approved within the Fermic, MAGIC, and VERITAS Collaborations) have been submitted for publication in the Astronomy and Astrophysics journal in 2014 June. During the MW campaign in 2011, Mrk~421 had an atypically high activity in the optical band, together with a very low state in the X-ray/VHE band. Typically, blazar emission models for Mrk~421 focus on the explanation of the variability in the X-ray and $gamma$-ray bands. This data set is suitable for examining emission models and estimate if they can describe the evolution of the whole broadband SEDs including the variabilities in optical, X-ray, and $gamma$-ray bands. We found that the one-zone SSC model can describe the relatively slow variation of the 2011 broadband SEDs. The modeling of these SEDs shows that the main factor dominating the spectral evolution could be the electron energy distribution (EED), instead of the environmental parameters like the blob size and the Doppler factor. To explain the featured high optical state together with the low X-ray/VHE state, several changes were needed in comparison to the typical state from 2009: a harder power-law index in the first segment in the EED, a lower first break in the EED, and a softer power-law index in the second segment in the EED. Besides, these optical high states had synchrotron peak frequencies 10 times lower than the typical state, while their synchrotron peak energy-fluxes were similar to those of the typical state. On the contrary, the 2010~March flaring activity showed that a high peak energy-flux was accompanied by a high peak frequency in comparison to the typical state, which has also been observed on several other blazars. This contrast showed that the broadband variability in the emission of Mrk~421 during 2011 had a different emph{flavor} with respect to the typical blazar broadband flaring activity. This PhD thesis shows that most variations in the SED of Mrk~421 can be produced through changes in the EED, which could shed light into how particles get accelerated in the vicinity of super-massive black holes, or within the relativistic jets of the active galactic nuclei. However, the results also show a large complexity in the evolution of the broadband (radio to VHE $gamma$-rays) SED. Thus longer and deeper observations are needed to understand what characteristics get repeated over time and hence typical, what characteristics are atypical, and ultimately, whether the lessons learned with Mrk~421 can be extended to high-synchrotron-peaked blazars in general.

Fakultät für Physik - Digitale Hochschulschriften der LMU - Teil 04/05

The centers of galaxies are their own ultimate gravitational sinks. Massive black holes and star clusters as well as gas are especially likely to fall into the centers of galaxies by dynamical friction or dissipation. Many galactic centers harbor supermassive black holes (SMBH) and dense nuclear (star) clusters which possibly arrived there by these processes. Nuclear clusters can be formed in situ from gas, or from smaller star clusters which fall to the center. Since the Milky Way harbors both an SMBH and a nuclear cluster, both can be studied best in the Galactic Center (GC), which is the closest galactic nucleus to us. In Chapter 1, I introduce the different components of the Milky Way, and put these into the context of the GC. I then give an overview of relevant properties (e.g. star content and distribution) of the GC. Afterwards, I report the results of four different studies about the GC. In Chapter 2, I analyze the limitations of astrometry, one of the most useful methods for the study of the GC. Thanks to the high density of stars and its relatively small distance from us it is possible to measure the motions of thousands of stars in the GC with images, separated by few years only. I find two main limitations to this method: (1) for bright stars the not perfectly correctable distortion of the camera limits the accuracy, and (2) for the majority of the fainter stars, the main limitation is crowding from the other stars in the GC. The position uncertainty of faint stars is mainly caused by the seeing halos of bright stars. In the very center faint unresolvable stars are also important for the position uncertainty. In Chapter 3, I evaluate the evidence for an intermediate mass black hole in the small candidate cluster IRS13E within the GC. Intermediate mass black holes (IMBHs) have a mass between the two types of confirmed black hole: the stellar remnants and the supermassive black holes in the centers of galaxies. One possibility for their formation is the collision of stars in a dense young star cluster. Such a cluster could sink to the GC by dynamical friction. There it would consist of few bright stars like IRS13E. Firstly, I analyze the SEDs of the objects in IRS13E. The SEDs of most objects can be explained by pure dust emission. Thus, most objects in IRS13E are pure dust clumps and only three young stars. This reduces the significance of the 'cluster' IRS13E compared to the stellar background. Secondly, I obtain acceleration limits for these three stars. The non-detection of accelerations makes an IMBH an unlikely scenario in IRS13E. However, since its three stars form a comoving association, which is unlikely to form by chance, the nature of IRS13E is not yet settled. In the third study (Chapter 4) I measure and analyze the extinction curve toward the GC. The extinction is a contaminant for GC observations and therefore it is necessary to know the extinction toward the GC to determine the luminosity properties of its stars. I obtain the extinction curve by measuring the flux of the HII region in the GC in several infrared HII lines and in the unextincted radio continuum. I compare these ratios with the ratios expected from recombination physics and obtain extinctions at 22 different lines between 1 and 19 micron. For the K-band I derive A_Ks=2.62+/-0.11. The extinction curve follows a power law with a steep slope of -2.11+/-0.06 shortward of 2.8 micron. At longer wavelengths the extinction is grayer and there are absorption features from ices. The extinction curve is a tool to constrain the properties of cosmic dust between the sun and the GC. The extinction curve cannot be explained by dust grains consisting of carbonaceous and silicate grains only. In addition composite particles, which also contain ices are necessary to fit the extinction curve. In the final part of this thesis (Chapter 5) I look at the properties of most of the stars in the GC. These are the old stars that form the nuclear cluster of the Milky Way. I obtain the mass distribution and the light distribution of these stars. I find that the flattening of the stellar distribution increases outside 70''. This indicates that inside a nearly spherical nuclear cluster dominates and that the surrounding light belongs mostly to the nuclear disk. I dissect the light in two components and obtain for the nuclear cluster L_Ks=2.7*10^7 L_sun. I obtain proper motions for more than 10000 stars and radial velocities for more than 2400 stars. Using Jeans modeling I combine velocities and the radial profile to obtain within 100'' (4 pc) a mass of 6.02*10^6 M_sun and a total nuclear cluster mass of 12.88*10^6 M_sun. The Jeans modeling and various other evidence weakly favor a core in the extended mass compared to a cusp. The old star light shows a similar core. The mass to light ratio of the old stars of the nuclear cluster is consistent with the usual initial mass function in the Galaxy. This suggests that most stars in GC formed in the usual way, in a mode different from the origin of the youngest stars there.

Fakultät für Physik - Digitale Hochschulschriften der LMU - Teil 02/05
Observation of Very-High-Energy Gamma-Rays from Blazars with the MAGIC Telescope

Fakultät für Physik - Digitale Hochschulschriften der LMU - Teil 02/05

Play Episode Listen Later Mar 20, 2008


Blazars, a subclass of active galactic nuclei in which the jet is aligned very close to our line of sight, can accelerate charged particles to relativistic energies in the jet. Electromagnetic emission from this class of sources can be observed from radio up to TeV energies. The MAGIC telescope is an Imaging Atmospheric Cherenkov Telescope with a 17-m diameter dish, located on the Canary Island of La Palma, in operation for exploring a new window of very high energy (VHE) gamma-ray bands, above 50 GeV. Searching for new VHE gamma-ray blazars, BL Lacertae was observed with the MAGIC telescope in 2005 and 2006. A VHE gamma-ray signal was discovered with a 5.1 sigma excess in the 2005 data. This discovery established a new class of VHE gamma-ray emitters, "low-frequency peaked BL Lac objects". On the other hand, the 2006 data showed no significant excess. This drop in flux followed the observed trend in the optical activity. The MAGIC telescope continuously observed the bright known blazars Mkn501, 1ES1959+650 and Mkn421. In particular, extensive simultaneous multiwavelength observations with the MAGIC telescope and the X-ray Satellite Suzaku were carried out for Mkn501 in July 2006 and for 1ES1959+650 in May 2006. VHE gamma-ray signals from about 100 GeV to a few TeV were clearly detected. For the first time, the VHE gamma-ray spectra were simultaneously obtained with the X-ray spectra during their low states of activity. Long term observations of Mkn421 in 2006 showed a strong variability in VHE gamma-ray emission. The spectral energy distributions (SEDs) of these four blazars could be well explained by a homogeneous one-zone synchrotron self-Compton model. This model suggests that the variation of the injected electron population in the jet is responsible for observed variations of the SEDs of the blazars. For all sources, the derived magnetic field strength in the jet and the Doppler beaming factor showed similar values. A contribution on the hardware sector is also presented in this thesis. For further lowering energy threshold in the MAGIC project, a new type of photosensor, "HPDs with an 18-mm diameter GaAsP photocathode", were developed. A quantum efficiency of the photocathode could reach over 50 %. Compared to the PMTs currently used in MAGIC, the new photosensors would improve the overall Cherenkov photon conversion efficiency by a factor of 2. Other performance values including lifetime also fulfilled the requirements of photosensors to be used in the MAGIC telescope.

Fakultät für Physik - Digitale Hochschulschriften der LMU - Teil 01/05
Synthetic spectra of massive stars as tool for the spectral analysis of stars and stellar clusters

Fakultät für Physik - Digitale Hochschulschriften der LMU - Teil 01/05

Play Episode Listen Later May 26, 2004


Using an improved model code, EUV spectral energy distributions (SEDs) have been computed for a large grid of stellar models spanning the parameter range observed for O and early B stars. These SEDs have been incorporated into an evolutionary population synthesis code to investigate the time-dependence of the integrated SEDs from evolving clusters of massive stars. Purpose of these calculations is to provide a crucial ingredient for the simulations of the photoionized gas in star-forming regions, which then yield information about the star-formation history of observed clusters. The new method used for computing the SEDs renders the influence of spectral lines on the EUV radiation field in identical quality as the high-resolution synthetic spectra used for comparison with observed UV spectra. By means of exemplary UV analyses of individual O stars it has been shown that the models reproduce most features of the observed UV spectra. As the appearance of the observable UV spectrum depends strongly on the spectral shape of the EUV radiation field, this result represents strong evidence that the computed SEDs are on a realistic level, an essential requirement for their application in photoionization calculations. Some minor discrepancies still remain, however, to be resolved in future work. The mass loss rates and terminal velocities from models with consistently calculated hydrodynamics have been shown to reproduce the theoretically predicted wind-momentum--luminosity relation, as well as the predicted metallicity dependence thereof, showing no distinct differences for dwarfs and supergiants. Comparison of the observed UV spectra of a sample of galactic O stars with the synthetic spectra of two sets of models, one based on selfconsistent hydrodynamics, the other on wind parameters derived from an analysis of optical lines, shows discrepancies that are consistent with the scenario of a fragmented stellar wind, although an in-depth investigation of other possible explanations, such as non-solar abundance patterns, remains to be performed. (This will require a detailed spectral analysis and comparative study of a sample of Galactic, LMC, and SMC stars.) The different relations previously obtained for dwarfs and supergiants from analyses of the H-alpha line might therefore be the result of inadequate assumptions made in modelling the optical lines.