首页|Evidence for particle acceleration approaching PeV energies in the W51 complex

Evidence for particle acceleration approaching PeV energies in the W51 complex

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The γ-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 capa-bility 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 γ rays emanating from the W51 com-plex,with energies from 2 to 200 TeV.The LHAASO measurements,for the first time,extend the y-ray emission from the W51 complex beyond 100 TeV and reveal a significant spectrum bending at tens of TeV.By combining the"π0-decay bump"featured data from Fermi-LAT,the broadband y-ray spectrum of the W51 region can be well-characterized by a simple pp-collision model.The observed spectral bend-ing feature suggests an exponential cutoff at～400 TeV or a power-law break at～200 TeV in the CR pro-ton 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 pro-duce the most energetic γ 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.

UHE γ-rayCosmic raysSNRW51CStar clusters

LHAASO Collaboration、Zhen Cao、F.Aharonian、Axikegu、Y.X.Bai、Y.W.Bao、D.Bastieri、X.J.Bi、Y.J.Bi、W.Bian、A.V.Bukevich、Q.Cao、W.Y.Cao、Zhe Cao、J.Chang、J.F.Chang、A.M.Chen、E.S.Chen、H.X.Chen、Liang Chen、Lin Chen、Long Chen、M.J.Chen、M.L.Chen、Q.H.Chen、S.Chen、S.H.Chen、S.Z.Chen、T.L.Chen、Y.Chen、N.Cheng、Y.D.Cheng、M.Y.Cui、S.W.Cui、X.H.Cui、Y.D.Cui、B.Z.Dai、H.L.Dai、Z.G.Dai、Danzengluobu、X.Q.Dong、K.K.Duan、J.H.Fan、Y.Z.Fan、J.Fang、J.H.Fang、K.Fang、C.F.Feng、H.Feng、L.Feng、S.H.Feng、X.T.Feng、Y.Feng、Y.L.Feng、S.Gabici、B.Gao、C.D.Gao、Q.Gao、W.Gao、W.K.Gao、M.M.Ge、L.S.Geng、G.Giacinti、G.H.Gong、Q.B.Gou、M.H.Gu、F.L.Guo、X.L.Guo、Y.Q.Guo、Y.Y.Guo、Y.A.Han、M.Hasan、H.H.He、H.N.He、J.Y.He、Y.He、Y.K.Hor、B.W.Hou、C.Hou、X.Hou、H.B.Hu、Q.Hu、S.C.Hu、D.H.Huang、T.Q.Huang、W.J.Huang、X.T.Huang、X.Y.Huang、Y.Huang、X.L.Ji、H.Y.Jia、K.Jia、K.Jiang、X.W.Jiang、Z.J.Jiang、M.Jin、M.M.Kang、I.Karpikov、D.Kuleshov、K.Kurinov、B.B.Li、C.M.Li、Cheng Li、Cong Li、D.Li、F.Li、H.B.Li、H.C.Li、Jian Li、Jie Li、K.Li、S.D.Li、W.L.Li、X.R.Li、Xin Li、Y.Z.Li、Zhe Li、Zhuo Li、E.W.Liang、Y.F.Liang、S.J.Lin、B.Liu、C.Liu、D.Liu、D.B.Liu、H.Liu、H.D.Liu、J.Liu、J.L.Liu、M.Y.Liu、R.Y.Liu、S.M.Liu、W.Liu、Y.Liu、Y.N.Liu、Q.Luo、Y.Luo、H.K.Lv、B.Q.Ma、L.L.Ma、X.H.Ma、J.R.Mao、Z.Min、W.Mitthumsiri、H.J.Mu、Y.C.Nan、A.Neronov、L.J.Ou、P.Pattarakijwanich、Z.Y.Pei、J.C.Qi、M.Y.Qi、B.Q.Qiao、J.J.Qin、A.Raza、D.Ruffolo、A.Sáiz、M.Saeed、D.Semikoz、L.Shao、O.Shchegolev、X.D.Sheng、F.W.Shu、H.C.Song、Yu.V.Stenkin、V.Stepanov、Y.Su、D.X.Sun、Q.N.Sun、X.N.Sun、Z.B.Sun、J.Takata、P.H.T.Tam、Q.W.Tang、R.Tang、Z.B.Tang、W.W.Tian、C.Wang、C.B.Wang、G.W.Wang、H.G.Wang、H.H.Wang、J.C.Wang、Kai Wang、L.P.Wang、L.Y.Wang、P.H.Wang、R Wang、W.Wang、X.G.Wang、X.Y.Wang、Y.Wang、Y.D.Wang、Y.J.Wang、Z.H.Wang、Z.X.Wang、Zhen Wang、Zheng Wang、D.M.Wei、J.J.Wei、Y.J.Wei、T.Wen、C.Y.Wu、H.R.Wu、Q.W.Wu、S.Wu、X.F.Wu、Y.S.Wu、S.Q.Xi、J.Xia、G.M.Xiang、D.X.Xiao、G.Xiao、Y.L.Xin、Y.Xing、D.R.Xiong、Z.Xiong、D.L.Xu、R F.Xu、R.X.Xu、W.L.Xu、L Xue、D.H.Yan、J.Z.Yan、T.Yan、C.W.Yang、C.Y.Yang、F.Yang、F.F.Yang、L.L.Yang、M.J.Yang、R.Z.Yang、W.X.Yang、Y.H.Yao、Z.G.Yao、L.Q.Yin、N.Yin、X.H.You、Z.Y.You、Y.H.Yu、Q.Yuan、H.Yue、H.D.Zeng、T.X.Zeng、W.Zeng、M.Zha、B.B.Zhang、F.Zhang、H.Zhang、H.M.Zhang、H.Y.Zhang、J.L.Zhang、Li Zhang、P.F.Zhang、P.P.Zhang、R.Zhang、S.B.Zhang、S.R.Zhang、S.S.Zhang、X.Zhang、X.P.Zhang、Y.F.Zhang、Yi Zhang、Yong Zhang、B.Zhao、J.Zhao、L Zhao、LZ.Zhao、S.P.Zhao、X.H.Zhao、F.Zheng、W.J.Zhong、B.Zhou、H.Zhou、J.N.Zhou、M.Zhou、P.Zhou、R.Zhou、X.X.Zhou、B.Y.Zhu、C.G.Zhu、F.R.Zhu、H.Zhu、K.J.Zhu、Y.C.Zou、X.Zuo、S.Celli

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Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

University of Chinese Academy of Sciences,Beijing 100049,China

TIANFU Cosmic Ray Research Center,Chengdu,China

Dublin Institute for Advanced Studies,31 Fitzwilliam Place,2 Dublin,Ireland

Max-Planck-Institut for Nuclear Physics,P.O.Box 103980,Hei-delberg 69029,Germany

School of Physical Science and Technology & School of Information Science and Technology,Southwest Jiaotong University,Chengdu 610031,China

School of Astronomy and Space Science,Nanjing University Nanjing 210023,China

Center for Astrophysics,Guangzhou University,Guangzhou 510006,China

Tsung-Dao Lee Institute&School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China

Institute for Nuclear Research of Russian Academy of Sciences,Moscow 117312,Russia

Hebei Normal University,Shijiazhuang 050024,China

University of Science and Technology of China,Hefei,230026,China

State Key Laboratory of Particle Detection and Electronics,China

University of Science and Technology of China,Hefei 230026,China

Key Laboratory of Dark Matter and Space Astronomy & Key Laboratory of Radio Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China

Research Center for Astronomical Computing,Zhejiang Laboratory,Hangzhou 311121,China

Key Laboratory for Research in Galaxies and Cosmology,Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China

School of Physics and Astronomy,Yunnan University,Kunming 650091,China

Key Laboratory of Cosmic Rays(Tibet University),Ministry of Education,Lhasa 850000,China

National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

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

Institute of Frontier and Interdisciplinary Science,Shandong University,Qingdao 266237,China

APC,Université Paris Cité,CNRS/IN2P3,CEA/IRFU,Observatoire de Paris,Paris 119 75205,France

Department of Engineering Physics,Tsinghua University,Beijing 100084,China

School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China

Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China

China Center of Advanced Science and Technology,Beijing 100190,China

College of Physics,Sichuan University,Chengdu 610065,China

School of Physics,Peking University,Beijing 100871,China

Guangxi Key Laboratory for Relativistic Astrophysics,School of Physical Science and Technology,Guangxi University,Nanning 530004,China

Department of Physics,Faculty of Science,Mahidol University,Bangkok 10400,Thailand

Moscow Institute of Physics and Technology,Moscow 141700,Russia

Center for Relativistic Astrophysics and High Energy Physics,School of Physics and Materials Science & Institute of Space Science and Technology,Nanchang University,Nanchang 330031,China

National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China

School of Physics,Huazhong University of Science and Technology,Wuhan,430074,China

Key Laboratory of Dark Matter and Space Astronomy & Key Laboratory of Radio Astronomy,Purple Mountain Observatory,Chi-nese Academy of Sciences,Nanjing 210023,China

Department of Physics,Sapienza University of Rome,Piazzale Aldo Moro 2,Rome 00185,Italy

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaDepartment of Science and Technology of Sichuan ProvinceDepartment of Science and Technology of Sichuan ProvinceProject for Young Scientists in Basic Research of Chinese Academy of SciencesProject for Young Scientists in Basic Research of Chinese Academy of Sciencesin Thailand by the National Science and Technology Development Agency(NSTDA)National Research Council of Thailand(NRCT):High-Potential Research Team Grant ProgramChengdu Management Committee of Tianfu New AreaMilky Way Imaging Scroll Painting(MWISP)projectNational Key R&D Program of ChinaNational Key R&D Program of ChinaCAS Key Research Program of Frontier Sciences

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2024

10.1016/j.scib.2024.07.017

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(18)
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