Title：Gamma-ray astronomy and Galactic cosmic rays

Speaker：Ruizhi Yang (USTC)

Time：3:00 pm May 09th (Thursday)

Tencent Meeting：42915400486 password: 6360

Location: Lecture Hall,3rd floor

Abstract：

Cosmic ray (CR) is one of the most important components in the interstellar medium (ISM) and the  origin of CRs remains as  a mystery.  The diffusion of CRs in turbulent magnetic fields erases the information on the distribution of CR accelerators to a large extent. The energy dependent diffusion of CRs also significantly modifies the initial (acceleration) spectra of CRs. In this regard,gamma-rays,the secondary products of interactions of CRs with gas and photons in the ISM,provide us more information about the origin of CRs. More specifically,  the gamma-ray emissions associated with gas,can be used to study the distribution of CRs throughout the Galaxy;the discrete gamma-ray sources can elucidate the locations of individual CR accelerators.  In this talk I will review the recent advances of the gamma-ray astronomy and focus on their implications to CR sciences.

CV：Prof. Ruizhi Yang got BSc in University of Science and Technology of China (USTC) in 2007 and got his PhD in 2013 in Purple Mountain Observatory,China Academy of Sceince. He was a postdoc fellow in Max-Planck-institute for nuclear physics (MPIK) in Heidelberg,Germany from 2013 to 2019. He is now a professor in the department of Astronomy in USTC. His research focuses on gamma-ray astronomy,cosmic ray science,indirect search of dark matter,and future gamma-ray instruments.