发稿时间:2020-06-02浏览次数:416

USTC Astronomy Colloquium Series: 2020 Spring
Numerical Study of AGN Feedback
袁峰  研究员
上海天文台
2020/6/2, 4:00pm , Zoom Id: 120630733
报告人:
Dr. Feng Yuan is a professor in Shanghai Astronomical Observatory, Chinese Academy of Sciences. He obtained his Ph.D. in USTC in 1997, then worked in Nanjing University, Max-Planck Institute of Radio Astronomy in Germany, Harvard University and Purdue University in the US as a postdoc, before he joining Shanghai Astronomical Observatory in 2005. He also has joint appointment in several universities such as USTC, Xiamen University, and Peking University. His main research interests include black hole accretion and outflow, active galactic nuclei, and AGN feedback effect in galaxy evolution.
摘要:
AGN feedback is widely assumed to play a crucial role in galaxy evolution, and is the key physical mechanism for the coevolution between the central black hole and its host galaxy. In this talk, I will first briefly review the current status of theoretical study of AGN feedback, which is mainly via numerical simulations. Then I will focus on introducing our recent series of works of AGN feedback. Different from most works which focus on cosmological scale such as Illustris-TNG and EAGLE, our works  focus on a single galaxy scale, thus we can well resolve the Bondi radius. This ensures we can obtain a precise estimation of AGN accretion rate and the state-of-the-art AGN physics can be adopted in our simulation. The interaction between AGN outputs and ISM and the feedback effect on star formation is calculated. We will discuss the cosmological timescale AGN light curve, black hole growth, star formation, and AGN duty cycle, and compare them with observations.