Title: Active galactic nuclei feedback in an isolated galaxy

Speaker: 袁峰（上海天文台）/ Feng Yuan (SHAO, CAS)

Venue: Gewu 4410

Time: 3:00 PM, Thursday, 24th May, 2018

Abstract: There are many observational evidence for the co-evolution between the supermassive black hole and its host galaxy. It is widely thought that the underlying physical mechanism is the interaction between the central active galactic nuclei and the galaxy, i.e., AGN feedback. This is a young field and many problems remain. For example, since the AGN is usually unresolved, 'sub-grid' physics has to be adopted and some parameterized approach to describe the AGN physics is used in the study. In this talk, after introducing some background of AGN feedback, I will introduce our most recent series of works on AGN feedback using high-resolution two-dimensional hydrodynamical numerical simulation. The key improvement in our works is that we adopt the most-updated AGN physics. The inner boundary of our simulation is small enough so that we can resolve the Bondi radius thus precisely calculate the accretion rate, which is crucial for feedback study. Interaction between wind and radiation from the AGN and interstellar medium of the galaxy is calculated, physical processes like star formation and SNe Ia and II are taken into account. We study the AGN light curve, typical AGN lifetime, growth of the black hole mass, AGN duty cycle, star formation, and X-ray surface brightness of the galaxy. We compare our simulation results with observations and find general consistency.

Personal Information: 1970年生于山东，1991年本科毕业于山东大学物理系，1997年获中国科技大学理学博士学位。1998年起至2005年先后在南京大学、德国马普射电天文研究所、美国哈佛大学、美国普渡大学进行博士后研究工作。2005年入选中科院“引进海外杰出人才”（百人计划），回国任上海天文台研究员。2008年获国家杰出青年基金资助。享受国务院特殊津贴，入选百千万人才工程“国家级有突出贡献中青年专家”、获得过上海市自然科学牡丹奖等奖项。现任中科院上海天文台副台长、上海天文台学术委员会主任。