报告题目：Puzzling accretion onto a black hole in M101 ULX-1

　　报 告 人：刘继峰研究员 （国家天文台）

　　报告摘要：Ultraluminous X-ray sources could be the long-sought intermediate mass black holes as necessary for current supermassive black hole formation theories; alternatively they could be stellar mass black holes somehow managing to radiate at near- or even super-Eddington luminosities. The key of ULX studies is to measure the black hole mass via dynamical means, which turns out to extremely difficult. Our dynamical mass measurement for M101 ULX-1 shows that it is a stellar mass black hole instead of an intermediate mass black hole as suggested by its X-ray properties. This fact makes it hard to understand the supersoft X-ray spectrum of M101 ULX-1.

　　时    间：周五(4月11日)下午4：00

　　地    点：苏福特三楼会议室

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