报告题目:黑洞潮汐撕裂恒星事件的红外回响
报 告 人:蒋凝 副研究员 中国科学技术大学
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.
报告人简介:
蒋凝,1987年7月出生,现任中国科学技术大学天文学系副研究员。2009和2015年毕业于中国科学技术大学,分别获学士和博士学位,攻读博士期间,在美国Carnegie天文台联合培养两年。随后在天文学系做博士后及特任副研究员,2019年4月被聘为副研究员。主要研究领域为黑洞潮汐撕裂恒星事件(TDE),中等质量黑洞, 超大质量黑洞与寄主星系的共同演化,活动星系核的大尺度环境以及时域天文相关的诸多问题。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年度中国十大天文科技进展。曾多次成功申请或使用包括Magellan(6.5米),P200(5米),CFHT(4米), Shane(3米)等望远镜的观测。
报告时间:2019年08月05日(周一)上午10:30
报告地点:台本部南楼210会议室