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Probing High-redshift Circum/Inter-galactic Medium Using both Emission and Absorption
報告題目: Probing High-redshift Circum/Inter-galactic Medium Using both Emission and Absorption
報?告? 人: 蔡崢 副教授 (清華大學)
報告時間: 2020-12-31 16:00:00
報告地點: ZOOM會議ID: 557 683 9595

摘要:

in this talk, i will present our survey of the most massive overdensities (progenitors of coma cluster) in the peak of cosmic star formation and qso activities (z=2--4).  i will present our discovery of a sample of massive overdensies at z~2.3 by utilizing subaru/hsc, keck, cfht and alma, selected using the groups of strong lya absorption. the galaxy properties in these overdensities reflect the emergence of the environmental dependence of galaxy property. i will further discuss the discovery of enormous lyman alpha nebulae in these extremely overdense fields at high redshift. these site are unique laboratories to study the preliminary intracluster medium properties and the igm-galaxy interactions. moreover, i will present our new observations of lyman alpha nebulae using keck cosmic web imager (kcwi). in the end, i will talk about the future prospects of how greatly improve our understanding of the structure formation in the next decade with lsst, cmb-s4 and a potentially new opportunity of a planned 6.5m spectroscopic telescope.


簡介:

蔡崢,清華大學天文系副教授,2008年畢業于中國科學技術大學,2015年獲得美國亞利桑那大學天體物理學博士學位,2015年—2019年在美國加州大學圣克魯茲分校從事博士后研究,2016年獲美國太空總署 (NASA) “哈勃學者” (Hubble Fellow) 。他發現宇宙早期大尺度結構以及發現宇宙早期最亮的星云。蔡崢領導(PI)的多項研究入選哈勃太空望遠鏡、以及地面最大望遠鏡近千小時的觀測計劃。他參與新的望遠鏡研發與科學規劃,包括載人航天空間站望遠鏡(CSST)星系宇宙學無縫光譜子課題負責人,他也正在策劃世界最大的光譜巡天望遠鏡。