【12.10; Seminar】2025年粒子天体物理全国重点实验室系列学术报告 #37：The origin of cosmic rays: particle acceleration and emission from super accreting X-ray binaries and active galactic nuclei

时间/Time: 12月10日周三上午9:30/Wensday, Decmeber 10, 9:30 a.m.

地点/Location: 多学科楼229 会议室/Meeting Room 229, Multidisciplinary Building

报告人/Speaker: 王界双（马普研究所•等离子体研究所）

题目/Title: The origin of cosmic rays: particle acceleration and emission from super accreting X-ray binaries and active galactic nuclei

主持人/Host: 李骢

摘要/Abstract: 

The origin of cosmic rays (CRs) remains an open question. The CR spectrum is characterized by two significant breaks: the knee at ~3 PeV (PeV=1e15 eV) and the ankle at ~3 EeV (EeV=1e18 eV). It is widely accepted that ultra-high-energy cosmic rays (UHECRs) above the ankle originate from extragalactic sources, with the transition energy between galactic and extragalactic components lying between the knee and the ankle. Observations suggest that Centaurus A could be a major source of UHECR anisotropies and the hotspot, supporting that radio galaxies are sources of UHECRs. Recent gamma-ray observation of microquasars suggests microquasar can accelerate particle efficiently at least up to several PeV. In this talk, I’ll present a framework based on turbulent acceleration in velocity shearing jet, where both multi-wavelength observation of radio galaxies and UHECR observations can be explained. Our relativistic magnetohydrodynamic and particle-in-cell (RMHD-PIC) simulations demonstrate that CRs can be accelerated close to the Hillas limit. With the derived jet parameters, we found that Centaurus A type sources can accelerated CR protons to several EeV while Cygnus A type sources can accelerate protons to above 10 EeV. Furthermore, similar acceleration can take place in galactic super-accreting microquasars, where around 10 sources can account for the CR flux between the knee and the ankle.

个人简介/Biography: 

Jieshuang Wang obtained his PhD in 2018 in Nanjing University. After completing his PhD, he joined the TDLI as a postdoctoral fellow. From 2022 to 2024, he was awarded an Alexander von Humboldt Fellowship and worked at the Max Planck Institute for Nuclear Physics in Germany. Since June 2024, he has been a postdoctoral researcher at the Max Planck Institute for Plasma Physics in Germany. His research interest lies in high-energy astrophysics and plasma astrophysics, focusing on extreme phenomena powered by compact stars such as accreting black holes, neutron star binaries, and magnetars. He investigates dynamics, particle acceleration, and multi-messenger radiation through both analytical modeling and numerical simulations. His recent research focus is the role of astrophysical jets in the origin of cosmic rays and multi-messenger signals. He has authored more than 50 publications, and received over 3000 citations.