【7.25; Seminar】2025年粒子天体物理全国重点实验室系列学术报告 #20：Activity of Galaxies and Supermassive Binary Black Holes

时间/Time: 7月25日周五上午10:00/Friday, July 25, 10:00 a.m.

地点/Location: 多学科楼312会议室/Meeting Room 312, Multidisciplinary building

报告人/Speaker: Prof. Luka Popovic (University of Belgrade, Serbia)

题目/Title: Activity of Galaxies and Supermassive Binary Black Holes

主持人/Host: 李彦荣研究员/ Dr. LI Yanrong

摘要/Abstract:

Active Galactic Nuclei (AGNs) are one of the most powerful sources in the universe, showing emission in a wide spectra range. It is widely accepted that the emitted energy is generated by accretion around a supermassive black hole (SMBH) in the center of AGNs. However, some AGNs show a high rate of variability and unusual line profiles, which may indicate the presence of a supermassive binary black hole (SMBBH) in the center of these objects. The role of collisions of SMBHs in the evolution of active galactic nuclei and galaxies seems to be significant. Therefore, the detections and observations of close supermassive binary black holes are of special interest since they can be sources of gravitational waves. In this talk, we present our investigation of the spectral characteristics and variability of AGNs with compact (sub-pc) SMBBH systems in their center and discuss the possibility of detection of SMBBHs.

个人简介/Biography:

Prof. Popovic earned his Bachelor of Science degree in 1988, followed by a Master of Science in 1991 and a Doctor of Philosophy in 1994.  Since 1992 he has been working at Astronomical Observatory in Belgrade and the University of Belgrade, Serbia. His scientific research areas include: active galactic nuclei, gravitational lenses MLE, Stark broadening in stellar atmospheres, and gamma ray burst.