Podcasts about frontier fields

這張速翕是 Hubble 太空望遠鏡 翕--ê 40 億光年遠 ê 大質量星系團 Abell 370。這个星系團上顯目--ê 是 2 个巨型長株圓星系 kah 滿四界 ê 光弧。實際上，這寡較暗--ê、四散--ê 藍色光弧，kah 影像中央下底 kah 倒爿 彼寡 足明顯 ê 龍形光弧，攏是 Abell 370 後壁 ê 星系。In ê 距離是 2 倍遠。本來看袂著 ê 光，這馬是去予星系團內底 以 超大質量 ê 烏暗物質 主導 ê 重力 kā 加強、扭曲去。這款效應就叫做重力透鏡，會當提供線索，予咱會當 影--著 早期宇宙 ê 星系。這款扭曲 時空 ê 結果，就是 愛因斯坦 100 冬前預測 ê 重力 透鏡 效應。相片內底 ê 光針，是 銀河內底 ê 前景星。正爿下跤 tī 這寡恆星後壁--ê，是 Abell 370，就 tī 海怪星座，海翁座 ê 方向遐。伊是 Frontier Fields 計畫內底欲翕--ê 6 个星系團內底 上尾一个。 ——— 這是 NASA Astronomy Picture of the Day ê 台語文 podcast 原文版：https://apod.nasa.gov/ 台文版：https://apod.tw/ 今仔日 ê 文章： https://apod.tw/daily/20230912/ 影像：NASA, ESA, Jennifer Lotz and the HFF Team (STScI) 音樂：P!SCO - 鼎鼎 聲優：阿錕 翻譯：An-Li Tsai (NSYSU) 原文：https://apod.nasa.gov/apod/ap230912.html Powered by Firstory Hosting

The Stellar Mass Function in CANDELS and Frontier Fields: the build-up of low mass passive galaxies since z~3 by P. Santini et al. on Sunday 25 September Despite significant efforts in the recent years, the physical processes responsible for the formation of passive galaxies through cosmic time remain unclear. The shape and evolution of the Stellar Mass Function (SMF) give an insight into these mechanisms. Taking advantage from the CANDELS and the deep Hubble Frontier Fields (HFF) programs, we estimated the SMF of total, star-forming and passive galaxies from z=0.25 to z=2.75 to unprecedented depth, and focus on the latter population. The density of passive galaxies underwent a significant evolution over the last 11 Gyr. They account for 60% of the total mass in the nearby Universe against ~20% observed at z~2.5. The inclusion of the HFF program allows us to detect, for the first time at z>1.5, the characteristic upturn in the SMF of passive galaxies at low masses, usually associated with environmental quenching. We observe two separate populations of passive galaxies evolving on different timescales: roughly half of the high mass systems were already quenched at high redshift, while low mass passive galaxies are gradually building-up over the redshift range probed. In the framework of environmental-quenching at low masses, we interpret this finding as evidence of an increasing role of the environment in the build-up of passive galaxies as a function of time. Finally, we compared our findings with a set of theoretical predictions. Despite good agreement in some redshift and mass intervals, none of the models are able to fully reproduce the observations. This calls for further investigation into the involved physical mechanisms, both theoretically and observationally, especially with the brand new JWST data. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.11250v1

This week's Community Shout. Events and Activities in Show Low - Pinetop - Lakeside Arizona This week's guests: Ivar & Cerridwyn - Medieval Mayhem New Location! The festival next year will be at Frontier Fields in Show Low. Medival Mayhem Website - https://www.mmhaf.org/ Upcoming Events Steam Punk Festival - Hon-Dah Oct 9-10 High Country Steampunk Festival - http://facebook.com/villageeventures   The following are the sponsors of the BIRDMAN ON THE MOUNTAIN show, please visit them and give them your support when you can, as they make this show possible. Premier Sponsors: Summit Healthcare   Bloom 'n Bean Bodyworks Health and Fitness Darbi's Cafe Elevate Athletics Fireground Digital Firehouse Subs Haven of Lakeside The House Restaurant The Hub La Casita Cafe The Lion's Den The Lodge Sports Bar & Grill The Maverick Magazine New Horizons Physical Therapy North Star Salon PersNIKKIty's Town of Pinetop-Lakeside Pour Station - White Mountain Purified Water The Show Low Chamber of Commerce Solterra Senior Living St. Anthony's School The Truck Stop VFW #9907 White Mountain Tees   Recorded at the Birdman Media Studios with WMI-TV, Show Low TV and Birdman Media in Lakeside. The Community Shout is how you the listener can come in and share anything from charity events, to fundraisers and even just to comment on how cool your neighbor is at no cost! Just stop by on Tuesday morning at 10:00 am in the Birdman Media Studios, located next to The Hub in Lakeside, have a seat and tell everyone what's going on.

This week's Community Shout. Events and Activities in Show Low - Pinetop - Lakeside Arizona This week's guests: Becky Montoya - Blue Ridge Junior High Counselor - Youth Mental Health 1st Aid Program - 8 hour class - FREE trainings for 18 and older. You may chose one of four sessions available to attend. Text 928.242.3860 or email bmontoya@brusd.org for more information. Birdman - Weekend Event Focus - Battle of the Bands and Food Vans - Saturday, August 31st 12pm - 10pm at the Frontier Fields.       The following are the sponsors of the BIRDMAN ON THE MOUNTAIN show, please visit them and give them your support when you can, as they make this show possible. Premier Sponsors: Summit Healthcare   Arizona Suspension Specialists and Total Car Care Bodyworks Health and Fitness Darbi's Cafe Elevate Athletics Fireground Digital Firehouse Subs Haven of Lakeside The House Restaurant The Hub La Casita Cafe The Lion's Den The Lodge Sports Bar & Grill The Maverick Magazine Navapache ChemDry New Horizons Physical Therapy North Star Salon PersNIKKIty's Town of Pinetop-Lakeside Pour Station - White Mountain Purified Water Solterra Senior Living St. Anthony's School The Truck Stop TGT's Mobile Home Services VFW #9907 White Mountain Tees     Recorded at the Birdman Media Studios with WMI-TV, Show Low TV and Birdman Media in Lakeside. The Community Shout is how you the listener can come in and share anything from charity events, to fundraisers and even just to comment on how cool your neighbor is at no cost! Just stop by on Tuesday morning at 10:00 am in the Birdman Media Studios, located next to The Hub in Lakeside, have a seat and tell everyone what's going on.

Two of these Frontier Fields galaxy clusters, going by their abbreviated names, are MACS J0416 and MACS J0717.

Gravitational Lensing is a unique technique to investigate the dark matter distribution of structures in the Universe, from galaxies, through galaxy groups, clusters, up to the large-scale structure. It allows us to map the total projected mass density of structures acting as lenses, and thus to shed light on the distribution and properties of the otherwise-invisible dark matter. Clusters of galaxies are the largest virialized structures in the universe. Gravitational lensing analysis allows us to study their mass distribution in great detail. Weak lensing probes the mass distribution in the outskirts of clusters based on a statistical analysis of the shape distortion observed in hundreds of galaxies behind the cluster. Strong lensing, instead, allows us to reconstruct high resolution mass and magnification maps of the central region of the cluster. In addition, thanks to the lensing magnification of background sources, galaxy clusters act as "Gravitational Telescopes" and can be used to investigate the galaxy population of the early Universe at z>5. In the first part of my Thesis I use the CLASH and Frontier Fields cluster RXC J2248 to investigate sources at z~6. At such and higher redshift galaxies appear as optical dropouts, since the light they emit is redshifted to NIR wavelengths and no flux is observed in the UV and optical filters. I discovered a z~6 lensed galaxy in the core of RXC J2248 which appears as a quintuple lensed optical dropout in the 16 HST filters of the CLASH survey. I perform a detailed photometric analysis of these dropouts to verify that they present the same photometric properties and are actually multiple images of the same source. In addition, by performing the strong lensing analysis of the cluster core I verify that the lensing model supports the quintuple and z~6 nature of this system. In the second part of my Thesis I use strong gravitational analysis of the CLASH cluster A383 to probe the details of the mass distribution of galaxies in the cluster core. Well known luminosity scaling relations allow us to relate the physical properties as stellar velocity dispersion and size of the elliptical galaxies to their observed luminosity. However in clusters, galaxies suffer tidal stripping due to the interaction with other cluster members and the cluster dark matter halo. The goal of this work is to measure the galaxy halo sizes in a cluster core to quantify how much mass was stripped relative to field galaxies. Here I present a new approach to strong lensing analysis of clusters, in which I use measurements of cluster members' velocity dispersions as additional constraints in the lens modeling. I apply this analysis to Abell 383 to separate the galaxy mass content from the smooth dark matter mass component and investigate how the dark matter halo size scales with the galaxy luminosity in the cluster core. In addition I perform the surface brightness reconstruction of the southern giant arcs to improve constraints on close by individual galaxies and study possible deviations from the global scaling law measured for the cluster.

The Hubble Telescope's new set of Frontier Fields images includes a galaxy some 13-billion light-years away, which makes it a candidate for the most distant object ever seen. Clara Moskowitz reports