Discovery of the most distant galaxy cluster in the universe and its indication on galaxy formation in dense environments

主讲人 (Speaker): 

王涛

主讲人单位 (Speaker's Institute): 

日本东京大学

邀请人 (Invited by): 

黄志琦

时间 (Time): 

星期四, 2019/01/10 - 10:00 to 11:00

地点 (Location): 

珠海校区海滨红楼17栋107 (Rm 107, Red House 17)

摘要 (Abstract): 

        Local galaxy clusters are exclusively dominated by massive ellipticals in their cores. However, whether and how the dense environment impacts the formation of these massive galaxies is still in active debate. This question is difficult to resolve in the local universe since most of the massive galaxies have stopped forming new stars since ~10 Gyrs ago, i.e., z>~1.5. As a result, studying galaxy clusters and protoclusters at z>1.5, when most of the massive galaxies are still star-forming, is the key to understanding the role of environment in the formation of massive galaxies. In this talk, I will introduce how we have discovered the most distant galaxy cluster known so far, CLJ1001, at z=2.51. In addition, unlike any clusters discovered so far, CLJ1001 is the first X-ray galaxy cluster that are dominated by star-forming galaxies in the core, which makes it an an ideal laboratory for studying massive galaxy formation in dense environments. I will summarize what we have learned so far from this unique structure from follow-up observations with HST, VLT, VLA, NOEMA and ALMA observations, and discuss how we can push forward the search of high-redshift clusters with future facilities that are accessible by Chinese astronomers

主讲人简介 (Speaker's CV): 

Dr. Tao Wang got his PhD from Department of Astronomy, Nanjing University in 2012. During his PhD he spent two years in Harvard-Smithonian Center for Astrophysics as a pre-doc. He was a junior researcher in Nanjing University during 2012-2013 and then went to CEA, Saclay, France as a post-doc during 2013-1016. Since 2017, he is a specially appointed researcher in University of Tokyo, Japan. His main interests are galaxy formation and evolution, especially focusing on the early universe. He is also interested in the co-evolution of galaxies and supermassive blackholes and Cosmology