Speaker: Cheng Li (Tsinghua University)

Venue: Gewu 4410

Time: 10:00 AM, Thursday, 27th September, 2018

Abstract: The cosmic star formation rate density has been declining since z~2-3, suggesting that the cessation of star formation has been the dominating process in galaxy evolution since then. However, it is unclear how the star formation gets quenched inside the galaxies and what physical mechanisms drive this process. Current integral field unit (IFU) surveys such as CALIFA and MaNGA are providing resolved spectroscopy for large samples of galaxies, while CO intensity mapping such as the EDGE survey is providing spatially resolved molecular gas mass density. These data allow the star formation histories and cold gas distribution across the whole galaxy area, and thus the quenching processes to be studied with high accuracy. I'll talk about our recent works based on these surveys, particularly the roles of internal structure (e.g. bars), molecular gas and environmental effect in driving the star formation quenching processes.

Personal Information: 

李成，2006年于中国科学技术大学天文系博士毕业，2007-2010年在中科院上海天文台及德国马普天体物理所做博士后，2010-2015年任上海天文台研究员、中科院马普小组组长，2015年至今任清华大学物理系教授。主要研究方向是星系结构、形成与演化，参与国际巡天SDSS和Subaru/PFS。发表论文110余篇，获引用6000余次。曾获国家杰出青年科学基金、上海市“浦江人才计划”、中科院“引进海外杰出人才”（百人计划）、上海市科学技术一等奖等资助或奖励。现任中国天文学会星系宇宙学专业委员会主任委员。