报告题目：高红移大质量星系的结构与形态

　　报 告 人：范璐璐博士（中国科学技术大学）

　　报告人介绍：范璐璐，男，2011年获意大利国际高等研究生院（SISSA）天体物理学博士学位。2011年10月至2012年4月，中国科学技术大学，博士后；后转聘为特聘副研究员；2013年10月至今，访问瑞典查尔莫斯大学Onsala天文台。研究方向：星系形成及演化。

　　摘    要：Recent observations show the dramatic evolution of the sizes of massive quiescent galaxies : Massive quiescent galaxies at redshifts z~2 exhibit on average physical sizes smaller, by factors 3-5, than local ETGs endowed with the same stellar mass. There are two important questions involving the formation and evolution of massive ETGs arisen :1) How did the small size of massive ETGs form at high redshift? 2) How did the compact, massive ETGs evolve to ’catch up’ the local relation? I will show the main physical mechanisms for size evolution. And also I will also show the recent results up to redshift 4 based on HST WFC3 observations. The second part of this talk will introduce the morphology of X-ray selected AGN hosts at z~2. Compared with a control sample of normal galaxies with similar stellar mass and redshift, we find there is no morphological difference and no enhanced signal of major merger. We conclude that major merger may be not the main triggering mechanism for X-ray selected AGN at z~2.

　　时    间：4月29日周二上午11:00

　　地    点：苏福特一楼会议室

欢迎各位老师、同学参加！

　　                                       南京大学天文与空间科学学院