报告题目：Probing super-Eddington accretion via tidal disruption events

报 告 人：Lixin Dai (University of Maryland)

报告时间：2017年2月16日下午2：00

报告地点：理科楼C302

报告摘要：A star wandering too close to a massive black hole can be torn apart by the tidal force of the black hole. Such a tidal disruption event (TDE) illuminates a massive black hole for about a year. In the first few months, stellar material can be supplied to the black hole at a rate greatly exceeding the Eddington accretion rate, giving us a perfect window to peek into super-Eddington accretion. The understanding of super-Eddington accretion has important implications for black hole growth and galaxy evolution in the early universe. In this talk, I will first give a summary of the observational status of TDEs. Then I will introduce the basics of TDE physics and present our theoretical calculations on what are the key parameters leading to super-Eddington TDEs. Lastly, I will talk about our 3D general relativistic radiation magnetohydrodynamics simulations of super-Eddington accretion disks in the context of TDEs. The results of these simulations provide us answers to some puzzles posed by TDE observations, and can be applied to study other super-Eddington astrophysical systems.