蔡峥2015年博士毕业于亚利桑那大学。2016年获得哈勃冠名博士后学者。2019年6月加入清华大学天文系。他的研究领域为早期星系宇宙学。特别地，他在z= 2–7 的早期星系、宇宙大尺度结构、与星系际介质的观测方面取得了进展，发表的多篇论文为星系宇宙学理论提供了新的重要限制。他在国际竞争激烈的重大天文设备（包括哈勃太空望远镜、ALMA亚毫米波阵列、KECK等）申请中获得大量观测时间。未来，他的研究方向包括：宇宙早期的星系宇宙学；基于人工智能的光谱大数据分析。同时，他也积极参与下一代6.5米宽视场光谱巡天望远镜的建设。
Zheng Cai broadly interests in extragalactic Astronomy and Cosmology. Specifically, Zheng is developing a novel technique that is designed to pinpoint the most massive protoclusters at z=2-3 by utilizing intergalactic neutral hydrogen absorption.
In addition, Zheng is leading a number of other projects that include studying
the early metal enrichment of intergalactic medium (IGM) at z=4-6; constraining the Population III stars in galaxies at z=7; and probing the quasar host galaxies at z=2-3.
Welcome Research CV Astronomy Links
Research
I appreciate my outstanding collaborators (collaborated on 2+ projects/proposals/papers):
Prof. Xiaohui Fan
(Ph.D. Thesis Advisor)
Prof. J. Xavier Prochaska
(Postdoc Host)
Fuyan Bian
Sebastiano Cantalupo
Romeel Dave
Hayley Finley
Brenda Frye
Richard Green
Shirley Ho
Linhua Jiang
Ian McGreer
Tony Mroczkowski
Marcel Neeleman
Pasquier Noterdaeme
Peng Oh
Sebastien Peirani
Daniel Stark
Nicolas Tejos
Feige Wang
Ran Wang
Jessica Werk
Martin White
Haojing Yan
Yujin Yang
Ann Zabludoff
Zhenya Zheng
I am developing a novel technique that is designed to pinpoint the most massive protocluster at z=2-3 by utilizing the intergalactic neutral hydrogen (Lyman alpha) absorption.
Theoretically, I used large scale N-body simulations (White et al. 2011, Peirani et al. 2014) to study the strong correlation between the 1-D Lyman alpha optical depth and 3-D mass.
Observationally, I use MMT, LBT, KPNO-4m, UKIRT, Bok, IRAM-30m, etc., to follow-up the largest 1-D IGM HI absorption, and also study the galaxy environment associated with these spectacular IGM absorption systems.
I am leading a couple projects which utilize the Damped Lyman Alpha systems (DLAs) as the natural coronagraph to study the quasar host galaxies in rest-frame UV regime at z=2-3 (Cai et al. 2014, paper submitted).
I am leading one HST project which uses the HST/ACS ramp filters to study the large-scale environment surrounding the CIV absorption systems at z=4.9, 5.1, 5.7 (Cai et al. 2015, in prep).
I led two HST projects that use HST/WFC3 IR narrowband filters to probe the He II 1640 emission of the highest redshift galaxies at z=7, and we have put the strongest upper limit on Pop-III star formation at z=7 to date (Cai et al. 2011 ApJL, Cai et al. 2014, paper submitted)
I am involved in several projects led by Xiaohui Fan (Thesis Advisor), Haojing Yan (Missuri), Daniel Stark (Arizona), Fuyan Bian (ANU), Ian McGreer (Arizona), Xuebing Wu (PKU), and Feige Wang (PKU) on searching for the highest redshift galaxies at z>7, and the most massive supermassive black holes at z>6 (Yan et al. 2012, Bian et al. 2014, Wu et al. 2014).
MApping the Most Massive Overdensity Through Hydrogen (MAMMOTH)
Studying of the Quasar Host Galaxies using DLAs as the Natural Coronagraph
Probing the Early Metal Enrichment of IGM at Reionization Epoch
Constraining the Population III Star Formation in Galaxies at z=7
Analytical Studies of the CMB Polarizations
I led one theoretical project in my undergraduate studies. In this project, I derived, for the first time, the full analytical formulae of CMB Polarization in Cosmological Synchronous Gauge. The paper has been published (Cai & Zhang, 2012, Classical Quantum Gravity, 29, 5009)
Highest Redshift Galaxies and Quasars
Page of Cluster and IGM/ICM
Made on a Mac
