报告题目：Understanding AGN Accretion Disks based on 3D Global Radiation MHD Simulations with Realistic Opacity

报 告 人：Yanfei Jiang

报告时间：2017年2月22日下午3：30

报告地点：蒙民伟科技南楼S727

报告摘要：Although AGN unification model is very successful to explain many observational properties of AGN, little progress has been made to understand the physical properties of the inner accretion disks, where most of the photons are emitted.The standard thin disk model, which has been widely used to model the accretion disks, causes a lot of puzzles for AGN disks theoretically and cannot easily explain recent micro-lensing observations and timing analysis of quasars.I will first point out that the iron opacity bump can significant change the structures and properties of AGN accretion disks compared to case with dominated electron scattering opacity. Then I will show a series of global 3D radiation MHD simulations of AGNs for a wide range of accretion rates, particularly the importance of density waves for angular momentum transfer and strong outflows from the disks driven by the strong opacity peaks. I will also discuss implications of these simulations for understanding AGNs and their interactions with the host galaxies.