The dust echoes of stellar tidal disruption events by supermassive black hole

主讲人 (Speaker): 孙鹿鸣

主讲人单位 (Speaker's Institute): 中国科技大学天文系

邀请人 (Invited by): 申荣锋

时间 (Time): 星期五, 2018/12/21 - 14:30 to 16:00

地点 (Location): 珠海校区海滨红楼17栋107会议室

摘要 (Abstract):

当恒星过于接近超大质量黑洞时会被潮汐撕裂并产生高能辐射的闪耀，即潮汐撕裂事件（TDE）。TDE的辐射会被周围环境中的尘埃吸收并产生红外再辐射，即尘埃回响。利用尘埃回响，一方面我们可以研究星系核区的尘埃性质，另一方面我们可以找到那些被视线上的尘埃遮蔽的TDE。在这个报告中我将介绍一系列有关TDE尘埃回响的最新工作，包括活动星系和非活动星系中核区尘埃的区别，利用尘埃回响研究核区尘埃的几何，利用红外光变曲线反推被遮蔽的耀变源的性质等等。

Tidal disruption event (TDE) occurs when a star passing by a super-massive black hole, and is tidally disrupted, and generates luminous flare of high-energy radiation. The surrounding dust heated by TDE can generate IR radiation, which can be called “dust echo”. Using this dust echo, on the one hand we can study the properties of the nuclear dust in the galaxy, on the other hand we can find the TDEs that are obscured by the dust in the line of sight. In this talk, I will introduce a series of recent works on the dust echoes of TDEs, including studying the difference between the nuclear dust in active galaxies and inactive galaxies, studying the geometry of the nuclear dust using the dust echoes of high-energy transients, and studying the nature of obscured transients using the infrared light curves.

主讲人简介 (Speaker's CV):

孙鹿鸣，于2017年在中国科学技术大学获得天文学博士学位，于2017年至今在中国科学技术大学从事博士后工作。 Luming Sun obtained his PhD in 2017 from the University of Science and Technology of China (USTC). Since 2017 he is a postdoc in USTC.