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[colloquium] Wenting Wang: Studies on low-mass satellite galaxies and faint diffuse stellar halos of isolated central galaxies

发表日期:2021-03-24来源:放大 缩小
 
国台学术报告2021 05 /NAOC Colloquium No.05 2021
暨国家天文台组建20周年学术报告 Colloquium for the 20th anniversary of NAOC
   
报告题目/Title Studies on low-mass satellite galaxies and faint diffuse stellar halos of isolated central galaxies
报告人/Speaker Dr. Wenting Wang (SJTU)
报告时间/Time Wednesday 2:30 PM, Mar. 24th, 2021
报告地点/Location A601, NAOC & Live Streaming
主持人/Host Prof. Jie Wang
报告语言/Language: English (英文报告)
报告海报/Poster Click to download the poster
演示幻灯片/Slides Click to download the slides
报告视频/Video Click to watch the video (later)
直播链接/Live Webcast: [科技馆直播地址]  [光明网直播地址]
   
报告摘要/Abstract  
In the standard cosmic structure formation paradigm, galaxies form in dark matter halos.  Smaller galaxies merge with larger halos, becoming satellite galaxies. Satellites lose their mass due to tidal stripping, which form stellar halos and streams around the central dominating galaxy. Low-mass satellites are particularly helpful in terms of distinguishing different dark matter models. We developed a statistical method to study these low-mass satellites, when their spectroscopic redshifts are not available. It has been applied to three surveys (HSC, DECaLS and SDSS). I will introduce the properties of these faint satellites and the connection to their central galaxies and host halos. A comparison is made against MW satellites, indicating our MW system is statistically atypical. In the second part, I will introduce our efforts of measuring the faint diffuse stellar halos by stacking galaxy images. The PSF-deconvolved surface brightness profiles are close to universal once scaled by the halo virial radius. Red galaxies have more extended stellar halos, redder and shallower color profiles and more satellites than blue counterparts, consistent with the galaxy formation theory that red galaxies stopped forming stars due to feedback, while their host halos, population of satellites and stellar halos keep growing. In the end, I will briefly introduce the measurement of proper motions for main sequence stars based on two deep surveys (HSC and SDSS Stripe 82).
   
报告人介绍/Bio:  

By combining both observational data and numerical simulations, Wenting Wang mainly works on galaxy formation and evolution, galaxy-halo connection and dynamical modelling of the Milky Way Galaxy. Wenting got her PhD. at Shanghai Astronomical Observatory in 2012, and meanwhile she visited the Max-Planck Institute for Astrophysics as an exchange student, working with Simon White. Afterwards, she worked as a postdoc at Durham University with Carlos Frenk and Shaun Cole (Durham Junior Research Fellowship), and at Kavli-IPMU (Tokyo University), before joining the Astronomy department of Shanghai Jiaotong University in 2019, as an associate researcher. In 2020, Wenting obtained the support from the Youqing fundation of NSFC.
 
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