报告题目：Survival of circumbinary disc around merging BHs

报 告 人：谢富国 副研究员（上海天文台）

摘  要：After the EM detection of the LIGO NS-NS merger event, one remaining open question is, whether or not we can observe EM signal for a BH-BH merger. It was widely considered to be intrinsically impossible, because most of the gases around the two BHs will be accreted (over a cosmological time) before the coalescence. We in this work provide a natural physical mechanism to halt the accretion of those circumbinary gases, which supports the idea proposed in de Mink & King (2017). With this mechanism, most of the pre-existing gases will remain outside of the two BHs, forming a decreation disk with a large fraction of gases cold enough to be MRI-inactive (so-called dead zone). Such disk will then provide feeding fuel for the BH after coalescence. An EM signal is then expected.

报告人简介：谢富国，2004年中国科大(USTC)本科毕；2009年上海天文台博士；2009-2011北京大学科维理研究所博士后；2011年起上海天文台工作，目前为副研究员。主要从事黑洞吸积理论及应用方面的研究。

报告时间：2018年8月16日（周四）上午11：00

报告地点：台本部南楼210会议室