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LHAASO与宇宙线起源 被引量:1

LHAASO and the origin of cosmic rays
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摘要 宇宙线的能谱延展到超过10^(15)电子伏特(PeV)的能段,这表明银河系中存在超高能的宇宙线加速源.而近期的甚高能伽马射线观测表明,长期以来被认为是主要宇宙线加速源的超新星遗迹很难把宇宙线加速到超高能.因此,寻找超高能(PeV)宇宙线加速源是宇宙线起源研究中的核心问题.其中一个最直接的方法就是寻找加速源附近宇宙线与星际气体相互作用产生的超高能伽马射线辐射.我国的高海拔宇宙线观测站(LHAASO),由于其在超高能伽马射线能段世界领先的灵敏度,成为这一研究的理想工具.LHAASO半阵列建成后一年之内,已经在银盘上观测到了十二个超高能伽马射线源,在这一领域取得了突破性的进展.本文将介绍这些已得到的观测结果,并对LHAASO全阵列建成后可能的新进展进行展望. The extension of the cosmic ray spectrum beyond 1 PeV(1 PeV = 10^(15)eV) indicates the existence of particle accelerators operating as Pe Vatrons in the Milky Way. However, recent gamma-ray observations reveal that supernova remnants(SNRs), considered the major source of galactic cosmic rays, have difficulty in accelerating cosmic rays to Pe V.Therefore, searching and identifying Pe Vatrons is crucial for understanding the origin of cosmic rays. The ultra-highenergy(UHE) gamma-ray observations will provide decisive evidence for such studies. Due to its high sensitivity in the UHE gamma-ray band, Large High Altitude Air Shower Observatory(LHAASO) would play a key role in the research on Pe Vatron. After running the 1/2 LHAASO-KM2 A array, 12 UHE gamma-ray sources were detected. This paper summarizes the observation results and discusses the prospect of the full LHAASO array.
作者 杨睿智 YANG RuiZhi(CAS Key Labrotory for Research in Galaxies and Cosmology,Department of Astronomy,University of Science and Technology of China,Hefei 230026,China;School of Astronomy and Space Science,Universityof Science and Technology of China,Hefei 230026,China)
出处 《中国科学:物理学、力学、天文学》 CSCD 北大核心 2022年第2期1-14,共14页 Scientia Sinica Physica,Mechanica & Astronomica
基金 国家自然科学基金(编号:11421303,12041305)资助项目。
关键词 宇宙线 伽马射线 伽马射线源 cosmic rays gamma-ray gamma-ray source
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