【11.28; Seminar】2025年粒子天体物理全国重点实验室系列学术报告 #34：Insight-HXMT view of fast variability in BHXRBs

时间/Time: 11月28日周五上午10:00/Friday, November 28, 10:00 a.m.

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

报告人/Speaker: 游贝 (武汉大学）/Bei You (Wuhan University)

题目/Title: Insight-HXMT view of fast variability in BHXRBs 

主持人/Host: 宋黎明/Liming Song

摘要/Abstract:

In a BHXRB, the X-ray emitting region is far too small to be directly imaged, but rapid variability of the X-ray signal can be used to infer the geometry by measuring time lags caused by material propagating towards the black hole and by coronal X-rays reflecting off the disk to imprint a reverberation lag. In this talk, I will introduce our recent theoretical/observational studies on the X-ray fast variability with HXMT observations. On short-timecale, we report on the first detection of the Compton hump reverberation feature from an X-ray binary, achieved by measuring lags in the broad energy range of 1-150 keV; On long-timescale, the lag measurements up to the highest energy to date reveal that this lag evolves dramatically on timescales of days. These discoveries helps us mapping the accretion flow at the very beginning of the outburst and its evolution.

个人简介/Biography:

游贝，武汉大学物理科学与技术学院教授，小米青年学者。2014年获得中国科学院上海天文台博士学位。2014-2017年在波兰科学院哥白尼天文中心开展博士后研究。2017年入职武汉大学，工作至今。长期从事黑洞吸积、喷流的研究，主要包括黑洞X射线双星爆发过程中能谱和时变的研究等。主持国家优秀青年科学基金和面上等项目。以第一作者和通讯作者，在《Science》、《Nature Communications》等国际学术刊物发表学术论文，揭示了黑洞吸积和磁场输运的物理过程。