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Evidence of Cosmic-Ray Acceleration up to Sub-PeV Energies in the Supernova Remnant IC 443

文献类型：期刊论文

作者Cao, Zhen1,2,3; Aharonian, F.3,4,5,6; Bai, Y. X.1,3; Bao, Y. W.7; Bastieri, D.8; Bi, X. J.1,2,3; Bi, Y. J.1,3; Bian, W.7; Bukevich, A. V.9; Cai, C. M.10
刊名Physical Review Letters
出版日期2026-04-24
卷号136期号:16
ISSN号0031-9007
DOI10.1103/pxn6-qzhz
产权排序第26完成单位
文献子类Journal article (JA)
英文摘要Supernova remnants (SNRs) have been considered as the primary contributors to cosmic rays (CRs) in our Galaxy. However, the maximum energy of particles that can be accelerated by shocks of SNRs is uncertain, and SNRs' contribution to CRs around PeV energies is unclear. In this Letter, we present observations of high-energy γ-ray emission from the SNR IC 443 using the Large High Altitude Air Shower Observatory (LHAASO). The morphological analysis reveals a pointlike source whose location and spectrum are consistent with those of the Fermi-LAT-detected compact source with π0-decay signature, and a more extended source that is associated with a newly discovered Fermi source. The spectrum of the point source can be described by a power-law function with an index of ∼3.0, extending beyond ∼30 TeV without apparent cutoff. Assuming a hadronic origin of the γ-ray emission, the 95% lower limit of accelerated protons reaches about 300 TeV. The extended source might be associated with IC 443, SNR G189.6+3.3, or the putative pulsar wind nebula CXOU J061705.3+222127, and can be explained by either a hadronic or a leptonic model with particles reaching hundreds of TeV. These LHAASO results provide compelling evidence that sub-PeV CRs can be accelerated efficiently by shocks of SNRs. © 2026 American Physical Society.
学科主题天文学 ; 星系与宇宙学
URL标识查看原文
资助项目N/A
语种英语
资助机构N/A
源URL[http://ir.ynao.ac.cn/handle/114a53/29206]  
专题星系类星体研究组
作者单位1.Key Laboratory of Particle Astrophysics and Experimental Physics Division and Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China;
2.University of Chinese Academy of Sciences, Beijing, 100049, China;
3.TIANFU Cosmic Ray Research Center, Sichuan, Chengdu, China;
4.University of Science and Technology of China, Anhui, Hefei, 230026, China;
5.Yerevan State University, 1 Alek Manukyan Street, Yerevan, 0025, Armenia;
6.Max-Planck-Institut for Nuclear Physics, P.O. Box 103980, Heidelberg, 69029, Germany;
7.Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China;
8.Center for Astrophysics, Guangzhou University, Guangdong, Guangzhou, 510006, China;
9.Institute for Nuclear Research of Russian Academy of Sciences, Moscow, 117312, Russia;
10.School of Physical Science and Technology and School of Information Science and Technology, Southwest Jiaotong University, Sichuan, Chengdu, 610031, China;
推荐引用方式
GB/T 7714		 Cao, Zhen,Aharonian, F.,Bai, Y. X.,et al. Evidence of Cosmic-Ray Acceleration up to Sub-PeV Energies in the Supernova Remnant IC 443[J]. Physical Review Letters,2026,136(16).
APA Cao, Zhen.,Aharonian, F..,Bai, Y. X..,Bao, Y. W..,Bastieri, D..,...&Pei, Z. Y..(2026).Evidence of Cosmic-Ray Acceleration up to Sub-PeV Energies in the Supernova Remnant IC 443.Physical Review Letters,136(16).
MLA Cao, Zhen,et al."Evidence of Cosmic-Ray Acceleration up to Sub-PeV Energies in the Supernova Remnant IC 443".Physical Review Letters 136.16(2026).

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