报告人：方芸博士（中国科学院国家天文台）

题目：Gravitational wave astrophysics about supermassive black holes (超大质量黑洞引力波天文学)

时间：2023年5月5日下午16:00

地点：理工楼1226

邀请人：王科

报告摘要：

Supermassive black holes (SMBHs) are observed to reside in the center of most galaxies. The fundamental relationship between the SMBHs and their host galaxies indicates common evolution histories. The formation and evolution history of SMBHs is barely known due to the limit of current observations. The formation and merger of SMBH binaries happen as a natural consequence of the merger of their host galaxies. The mechanism that drives the SMBH binary to merge is under debate. The observations of SMBHs and binaries are required to address these problems. I will introduce our recent works on probing the delay time of SMBH binary mergers through future space-based gravitational wave detectors (such as LISA) and on detecting SMBH binaries at sub-parsec separations with VLBI (such as Event Horizon Telescope). The existence of SMBH also influences the dynamical evolution and gravitational radiation of small binaries revolving around it. I will also talk about the relativistic dynamical evolution of a stellar binary in the vicinity of a spinning SMBH, and discuss the characteristic of gravitational waves from this stellar binary excited to the LISA band.

报告人简介：

Yun Fang obtained her Ph.D. degree in July 2020 from the Institute of Theoretical Physics, CAS, supervised by Qing-Guo Huang. She joined KIAA as a PKING fellow working on the project of gravitational astrophysics, from 2020.09-2022.06. She then visited Perimeter Institute in Canada from 2022.06 to 2023.03. Now she is visiting NAOC, CAS. Yun Fang is working on the gravitational (wave) astrophysics regarding SMBHs, such as the formation and evolution history of SMBHs, the dynamical evolution of SMBH-binary triple system and gravitational waves, etc.