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Evidence for particle acceleration approaching PeV energies in the W51 complex

文献类型：期刊论文

作者Cao, Zhen6,7,8; Aharonian, F.5,9; Axikegu10; Bai, Y.X.6,8; Bao, Y.W.11; Bastieri, D.12; Bi, X.J.6,7,8; Bi, Y.J.6,8; Bian, W.25; Bukevich, A.V.26
刊名SCIENCE BULLETIN
出版日期2024-09
卷号69期号:18页码:2833-2841
关键词UHE gamma-ray Cosmic rays SNR W51C Star clusters
ISSN号2095-9273
DOI10.1016/j.scib.2024.07.017
产权排序第25完成单位
文献子类Article
英文摘要The gamma-ray emission from the W51 complex is widely acknowledged to be attributed to the interaction between the cosmic rays (CRs) accelerated by the shock of supernova remnant (SNR) W51C and the dense molecular clouds in the adjacent star-forming region, W51B. However, the maximum acceleration capability of W51C for CRs remains elusive. Based on observations conducted with the Large High Altitude Air Shower Observatory (LHAASO), we report a significant detection of gamma rays emanating from the W51 complex, with energies from 2 to 200 TeV. The LHAASO measurements, for the first time, extend the gamma-ray emission from the W51 complex beyond 100 TeV and reveal a significant spectrum bending at tens of TeV. By combining the ''pi(0)-decay bump featured data from Fermi-LAT, the broadband gamma-ray spectrum of the W51 region can be well-characterized by a simple pp-collision model. The observed spectral bending feature suggests an exponential cutoff at similar to 400 TeV or a power-law break at similar to 200 TeV in the CR proton spectrum, most likely providing the first evidence of SNRs serving as CR accelerators approaching the PeV regime. Additionally, two young star clusters within W51B could also be theoretically viable to produce the most energetic gamma rays observed by LHAASO. Our findings strongly support the presence of extreme CR accelerators within the W51 complex and provide new insights into the origin of Galactic CRs. (c) 2024 Science China Press. Published by Elsevier B.V. and Science China Press. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
学科主题天文学 ; 天体物理学 ; 高能天体物理学
URL标识查看原文
出版地RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS
WOS关键词TEV GAMMA-RAYS ; SUPERNOVA REMNANT ; MOLECULAR CLOUD ; CRAB-NEBULA ; EMISSION ; CLUSTERS
资助项目National Natural Science Foundation of China[12393851,12261160362]; National Natural Science Foundation of China[12393852]; National Natural Science Foundation of China[12393853]; National Natural Science Foundation of China[12393854]; National Natural Science Foundation of China[12022502]; National Natural Science Foundation of China[2205314]; National Natural Science Foundation of China[12105301]; National Natural Science Foundation of China[12105292]; National Natural Science Foundation of China[12105294]; National Natural Science Foundation of China[12005246]; National Natural Science Foundation of China[12173039]; Department of Science and Technology of Sichuan Province[24NSFJQ0060]; Department of Science and Technology of Sichuan Province[2024NSFSC0449]; Project for Young Scientists in Basic Research of Chinese Academy of Sciences[YSBR-061]; Project for Young Scientists in Basic Research of Chinese Academy of Sciences[2022010]; National Science and Technology Development Agency (NSTDA); National Research Council of Thailand (NRCT): High-Potential Research Team Grant Program[N42A650868]; Chengdu Management Committee of Tianfu New Area; National Key R&D Program of China[2023YFA1608000]; National Key R&D Program of China[2017YFA0402701]; CAS Key Research Program of Frontier Sciences[QYZDJ-SSW-SLH047]
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:001366059700001
出版者ELSEVIER
资助机构National Natural Science Foundation of China[12393851,12261160362, 12393852, 12393853, 12393854, 12022502, 2205314, 12105301, 12105292, 12105294, 12005246, 12173039] ; Department of Science and Technology of Sichuan Province[24NSFJQ0060, 2024NSFSC0449] ; Project for Young Scientists in Basic Research of Chinese Academy of Sciences[YSBR-061, 2022010] ; National Science and Technology Development Agency (NSTDA) ; National Research Council of Thailand (NRCT): High-Potential Research Team Grant Program[N42A650868] ; Chengdu Management Committee of Tianfu New Area ; National Key R&D Program of China[2023YFA1608000, 2017YFA0402701] ; CAS Key Research Program of Frontier Sciences[QYZDJ-SSW-SLH047]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/27827]  
专题星系类星体研究组
云南天文台_丽江天文观测站（南方基地）
云南天文台_其他
作者单位1.School of Physics and Astronomy (Zhuhai) & School of Physics (Guangzhou) & Sino-French Institute of Nuclear Engineering and Technology (Zhuhai), Sun Yat-sen University, Zhuhai 519000 & Guangzhou 510275, Guangdong, China;
2.Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao 266237, China;
3.APC, Université Paris Cité, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Paris 119 75205, France;
4.Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
5.Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, 2 Dublin, Ireland;
6.Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
7.University of Chinese Academy of Sciences, Beijing 100049, China;
8.TIANFU Cosmic Ray Research Center, Chengdu, China;
9.Max-Planck-Institut for Nuclear Physics, P.O. Box 103980, Heidelberg 69029, Germany;
10.School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China;
推荐引用方式
GB/T 7714		 Cao, Zhen,Aharonian, F.,Axikegu,et al. Evidence for particle acceleration approaching PeV energies in the W51 complex[J]. SCIENCE BULLETIN,2024,69(18):2833-2841.
APA Cao, Zhen.,Aharonian, F..,Axikegu.,Bai, Y.X..,Bao, Y.W..,...&Celli, S..(2024).Evidence for particle acceleration approaching PeV energies in the W51 complex.SCIENCE BULLETIN,69(18),2833-2841.
MLA Cao, Zhen,et al."Evidence for particle acceleration approaching PeV energies in the W51 complex".SCIENCE BULLETIN 69.18(2024):2833-2841.

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来源：云南天文台

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