Podcasts about seds

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

dust engine alternatively sn nir lcs arxiv sne iib putative seds

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

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

dust candidates emission embedded sed mpc jwst pah ngc arxiv myr seds star clusters

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

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

data band cnn discovering method albert einstein visual wide networks modeling visible imaging sed spectral arxiv quasars seds convolutional infrared survey explorer

A search for thermal gyro-synchrotron emission from hot stellar coronae

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

search stellar emission thermal bayesian gyro ghz arxiv algol synchrotron seds t tauri

A Panchromatic Study of Massive Stars in the Extremely Metal-Poor Local Group Dwarf Galaxy Leo A

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

stars study poor massive metal galaxy ob uv dwarf nir lte mpc hubble space telescope arxiv local group seds nuv

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

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

dust candidates emission embedded sed mpc jwst pah ngc arxiv myr seds star clusters

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

giant diverse sf belt gould complementary sed disk fluctuations sfr year history arxiv myr three million dissipation star formation planet formation seds

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

SN 2018gk Revisited: the Photosphere, the Central Engine, And the Putative Dust

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

dust engine alternatively sn nir lcs arxiv sne iib putative seds

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

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

dust candidates emission embedded sed mpc jwst pah ngc arxiv myr seds star clusters

A search for thermal gyro-synchrotron emission from hot stellar coronae

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

search stellar emission thermal bayesian gyro ghz arxiv algol synchrotron seds t tauri

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

giant diverse sf belt gould complementary sed disk fluctuations sfr year history arxiv myr three million dissipation star formation planet formation seds

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

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

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

data band cnn discovering method albert einstein visual wide networks modeling visible imaging sed spectral arxiv quasars seds convolutional infrared survey explorer

A Panchromatic Study of Massive Stars in the Extremely Metal-Poor Local Group Dwarf Galaxy Leo A

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

stars study poor massive metal galaxy ob uv dwarf nir lte mpc hubble space telescope arxiv local group seds nuv

A search for thermal gyro-synchrotron emission from hot stellar coronae

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

search stellar emission thermal bayesian gyro ghz arxiv algol synchrotron seds t tauri

A new look at the infrared properties of z sim 5 galaxies

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

ir rebels properties relying new look alpine galaxies infrared sed fir sfr arxiv cii seds

Polar Dust Emission in Quasar IR SEDs and Its Correlation with Narrow Line Regions

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

letter wise dust ir narrow polar emission regions correlation agn w2 spitzer quasar arxiv w4 w3 seyfert sdss seds agns oiii

Dust Temperature and Emission of FirstLight Simulated Galaxies at Cosmic Dawn

3d dust mid interstellar temperature monte carlo emission polaris galaxies ism simulated first light cosmic dawn seds

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

Transition disks: the observational revolution from SEDs to imaging

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

revolution transition imaging sed observational nienke arxiv disks marel seds

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

revolution transition imaging sed observational nienke arxiv disks marel seds

Transition disks: the observational revolution from SEDs to imaging

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

revolution transition imaging sed observational nienke arxiv disks marel seds

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

revolution transition imaging sed observational nienke arxiv disks marel seds

A Full Spectral Timing Model for AGN Untangling the Variability in Fairall 9

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

model timing uv agn untangling sed spectral variability blr arxiv seds

The UV Excesses of Supernovae and the Implications for Studying Supernovae and Other Optical Transients

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

implications studying fitting uv optical lcs arxiv supernovae transients kne seds tdes

Modeling the time variable spectral energy distribution of the blazar CTA 102 from 2008 to 2022

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

energy distribution modeling detailed compton cta variable spectral doppler jet set arxiv blazar nustar seds

The Study of Dust Formation of Six Tidal Disruption Events

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

study events dust disruption ir formation uv tidal arxiv seds tdes

Extension of HOPS Out to 500 ParSecs eHOPS I Identification and Modeling of Protostars in the Aquila Molecular Clouds

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

class wise extension clouds modeling orion identification molecular hops aquila herschel spitzer arxiv parsecs class ii seds

The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 3

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

data large compton catalog telescope sed fermi detected mev arxiv seds agns active galactic nuclei

Comparison of star formation histories of AGN and non-AGN galaxies

Let's Go to Space: BLUE-SKY Learning

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

history comparison bd agn galaxies sed balmer arxiv lx cigale star formation seds

Episode 72: From Colombia to Space

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

university washington space development dc students colombia exploration satellites hailing central florida industrial engineering universal orlando resort industrial engineers minority serving institutions seds

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.

space wordpress orbital parameters waveform seds

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

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

SSPI

Play Episode Listen Later Jun 13, 2021 35:57

united states leaders competition winners boulder colorado colorado boulder university of colorado usa team seds

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

american founders vision space reaching senior fellow new worlds seds space frontier foundation

EP25. Participação feminina no setor público

semana frente trabalho realizado cumpre seds

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!

neste p blico participa clique feminina imperd setor p seds

#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.

EP22. Continuidade de políticas públicas

estado pol gest estrat pol ticas p blicas continuidade seds

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:

EP21. Os 20 anos do Bom Prato

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.

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EP20. Residências Inclusivas para pessoas com deficiências

Techno Music - Techno Live Sets Podcast

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!

social neste seja pessoas defici carmo resid bauru inclusivas apae seds

SedsCast 013 (Extended 90 min set) by Chris Liebing

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 […]

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EP19. Posto de Atendimento da SEDS no Poupatempo

capital neste estado interior martins patr secretaria posto atendimento desenvolvimento social itaquera seds

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.

#25 Peter Diamandis

future space isu peter diamandis xprize seds

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

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.

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"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.

pnw dirtbags cpw matthis seds

#10 Space Journalism with Jeff Foust

space phd mit journalism caltech senior writer early career planetary science geophysics board advisor space news foust seds

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

#07 Making Spaceflight Accessible with Grant Bonin

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

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#05 Becoming a Space Doctor with Kris Lehnhardt

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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

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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

#04 Redefining GEO with Ryan McLinko

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

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#02 Jack of All Space Trades with Will Pomerantz

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

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Exploring Space Medicine With Dominic Tanzillo

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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.

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

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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.

Launching Both CubeSats and Events With SEDS Rice President Ryan Udell

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

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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!

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