【11.3; Seminar】2025年粒子天体物理全国重点实验室系列学术报告 #29：Revisiting a standard example of intermediate mass black hole

时间/Time: 11月3日周一上午10:00/Monday, November 3, 10:00 a.m.

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

报告人/Speaker: Roberto Soria（Italian National Institute for Astrophysics & UCAS Associate）

题目/Title: Revisiting a standard example of intermediate mass black hole

主持人/Host: 陶炼/Lian Tao

摘要/Abstract:

The X-ray source HLX-1 near the galaxy ESO243-49, at about 100 Mpc away, is often taken as the prototypical example of off-nuclear IMBHs, with its soft X-ray spectrum and possible location inside a massive star cluster. It is probably the IMBH candidate with the best set of multiband observations over two decades. Despite all this, I argue that we do not actually know what is going on in HLX-1. In particular, we do not know what is causing the series of X-ray outbursts (a disk instability? a partial tidal disruption?), whether the soft X-ray temperature and luminosity are reliable indicators of the BH mass, where the optical emission is coming from (a disk? a photosphere?), and even whether the system really belongs to ESO243-49. I will outline the unsolved problems and some of the alternative scenarios, and compared HLX-1 with other X-ray-bright IMBH candidates discovered in recent years.

个人简介/Biography:

PhD at the Australian National University in Canberra

Research fellow at University College London, then at Harvard-Smithsonian CfA, and then Curtin University (Perth, Australia).

Lecturer at UCAS/NAOC during mid-2017 to mid-2023