Title:  Black Holes seen in the Gamma-ray Sky

Speaker: 李剑

Institute: 中国科学技术大学

Host: 刘彤

Time: 2025.4.24 周四 14:30

Location: 物理楼 552

Abstract: 

Gamma-ray astronomy serves as a unique window into the most extreme phenomena in our universe, providing critical insights into high-energy particle acceleration mechanisms. Among astrophysical objects, black holes (BHs) constitute the most populated class of gamma-ray sources, serving as potential keys to several longstanding astrophysical puzzles - including the origin of cosmic rays, the nature of galactic/extragalactic diffuse gamma-ray backgrounds, and astrophysical neutrino origins. Beyond their relativistic jets, contemporary models suggest multiple particle acceleration mechanisms operating in BH environments, which could generate detectable gamma-ray emissions. In this presentation, I will discuss our recent investigations of BH-related gamma-ray phenomena with LHAASO and Fermi-LAT observations.

Bio: 

Prof. Jian Li is a professor at the Department of Astronomy, University of Science and Technology of China (USTC). He obtained his Ph.D. from the Institute of High Energy Physics, Chinese Academy of Sciences in 2013. Following his doctoral studies, he conducted postdoctoral research at the Institute of Space Sciences, Spain (ICE-CSIC) from 2013 to 2015, where he was subsequently promoted to Research Scientist (2015-2017). As a Humboldt fellow (2017-2020), he advanced his research at Deutsches Elektronen-Synchrotron DESY before joining USTC in 2021. His primary research focuses on high-energy astrophysics and γ-ray astronomy, particularly through multi-messenger observational approaches, with over 100 SCI-indexed publications (18 as first/corresponding author, including two papers in Nature Astronomy--one as first/sole corresponding author, one as co-corresponding author). Prof. Jian Li is a full member of the Fermi-LAT collaboration (served as galactic science coordinator in 2020-2022) and LHAASO collaboration (serving on both Physics Coordination Committee and Speaker Committee). He is also part of the HXMT and eXTP collaboration. With extensive peer-review experience, he regularly evaluates submissions for A&A, ApJ, MNRAS, JHEAP, and JCAP, while also serving as an internal reviewer for Fermi-LAT collaboration and observation proposals for HXMT and FAST.

Related Papers:

https://arxiv.org/abs/2410.08988

https://arxiv.org/abs/2502.19189

https://ui.adsabs.harvard.edu/abs/2020NatAs...4.1177L/abstract