主持人：刘四明教授

时间：2026年1月15日（周四）14：00

地点：犀浦校区三教30334报告厅

腾讯会议：783-862-927

Title: Revealing the Origin of Galactic Cosmic Rays: PeVatrons in the Milky Way

主讲人：Felix Aharonian 国际著名粒子天体物理学家

Felix Aharonian教授长期担任德国马克斯·普朗克核物理研究所高能天体物理团队负责人及爱尔兰都柏林高等研究院院长。荣获多项国际荣誉，包括2006年欧盟笛卡尔奖、2010年布鲁诺·罗西奖以及2014年维克多·安巴楚勉国际奖。他于2008年当选亚美尼亚科学院外籍院士，2011年入选爱尔兰科学院院士，2017年成为欧洲科学院院士。作为国际知名甚高能伽马射线望远镜HESS合作组的核心成员，他深度参与了该合作组大部分重要成果的发表工作。2020年，应邀加入我国国家重大科技基础设施“高海拔宇宙线观测站（LHAASO）”合作组，担任科学顾问。Felix Aharonian长期活跃于国际高能天体物理研究领域，已发表学术论文650余篇，总被引超过4万次，H指数高于100，并著有《极高能宇宙伽马辐射》《高能伽马射线天文学》 等专著.

Abstract:

For decades, physicists and astronomers have grappled with a fundamental cosmic mystery: the origin of cosmic rays, particularly around the so-called knee of the energy spectrum at E ≳ 1 PeV (10¹⁵eV). While the Galactic origin of this spectral feature - identified as early as the 1950s - is widely accepted, pinpointing the astrophysical objects capable of accelerating particles to such extreme energies has remained a significant challenge.

In recent years, however, a compelling set of clues has begun to emerge. Dozens of extraordinary objects have now been discovered across the Milky Way emitting ultra-high-energy (E ≳0.1 PeV) gamma rays, revealing the locations of extreme cosmic-ray factories known as PeVatrons. These sources span a remarkably diverse range of environments and physical processes, including supernova remnants, young star-forming regions, rapidly rotating neutron stars, and compact binaries powered by accreting black holes.

Remarkably, despite this diversity, all of these systems appear to share a common potential: they function as extreme particle accelerators, operating close to fundamental theoretical limits. Although the search for Galactic PeVatrons has only just begun, these discoveries suggest that we may finally be approaching a long-sought understanding of the most potent engines of relativistic plasma in our Galaxy and of how they supply high-energy cosmic rays to the Milky Way.