报告摘要

Tidal disruption event (TDE) happens when a star approaches too close to a supermassive black hole (SMBH). If the medium in the vicinity of the BH is dusty, the primary emission of the TDE (soft X-ray, UV, optical) will be reprocessed into the infrared (IR) band. We have discovered the IR echoes of TDEs for the first time in the nearby event ASASSN-14li and more in others utilizing the public WISE data. The IR echoes are much more evident for TDEs in active galaxies than quiescent galaxies because of pre-existing torus in AGNs. The TDE IR echoes provide us a unique opportunity to probe the pc-scale dust (e.g., torus) in the galactic nuclei, which is otherwise extremely difficult to probe. Moreover, we are searching for new TDEs basing on WISE light curves and have built a large sample of candidates. Our multi-wavelength follow-up observations are very encouraging and unveil some interesting results.

报告人

蒋凝 (中国科学技术大学)

报告人介绍

蒋凝，安徽桐城人，1987年7月出生，分别于2009年和2015年在中国科学技术大学天文学系获得本科和博士学位，博士期间2012.10-2014.9在美国Carnegie天文台联合培养。2015.7-2018.1在科大天文学系做博士后，现任天文学系特任副研究员。主要围绕星系中心的超大质量黑洞进行多方面的观测天文研究，包括寻找中等质量黑洞，黑洞潮汐撕裂恒星事件，超大质量黑洞与寄主星系的共同演化等等。其作为主要完成人“首次发现黑洞潮汐撕裂恒星事件的红外回响信号”的工作入选2016年度国内天文十大科技进展。

地点

物理学院新楼4楼阳光房

时间

2018年12月6日下午2点-4点

邀请人

牟国斌研究员