First Detection of Ultrahigh Energy Emission from Gamma-Ray Binary LS I +61° 303
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 | 2026-05-08 |
| 卷号 | 136期号:18 |
| 关键词 | Cosmic rays & astroparticles Gamma ray astronomy Binary stars |
| ISSN号 | 0031-9007 |
| DOI | 10.1103/7xhp-tff7 |
| 产权排序 | 第26完成单位 |
| 文献子类 | Journal article (JA) - |
| 英文摘要 | We report the first detection of gamma-ray emission up to ultrahigh-energy (UHE; >100 TeV) emission from the prototypical gamma-ray binary system LS I +61° 303 using data from the Large High Altitude Air Shower Observatory. It is detected with significances of 9.2σ in the Water Cherenkov Detector Array (WCDA, 1.4-30.5 TeV) and 6.2σ in the Kilometer Square Array (KM2A, 25-267 TeV); in KM2A alone we identify 16 photonlike events above 100 TeV against an estimated 5.1 background events, corresponding to a 3.8σ detection. These results provide compelling evidence of extreme particle acceleration in LS I +61° 303. Furthermore, we observe orbital modulation at 3.9σ confidence level, between 25 and 100 TeV, with a hint that the orbital modulation is energy dependent. These features can be understood in a composite scenario in which leptonic and hadronic processes jointly contribute. © 2026 American Physical Society. |
| 学科主题 | 天文学 ; 恒星与银河系 ; 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/114a53/29246]  |
| 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. First Detection of Ultrahigh Energy Emission from Gamma-Ray Binary LS I +61° 303[J]. Physical Review Letters,2026,136(18). |
| APA | Cao, Zhen.,Aharonian, F..,Bai, Y. X..,Bao, Y. W..,Bastieri, D..,...&Qi, J. C..(2026).First Detection of Ultrahigh Energy Emission from Gamma-Ray Binary LS I +61° 303.Physical Review Letters,136(18). |
| MLA | Cao, Zhen,et al."First Detection of Ultrahigh Energy Emission from Gamma-Ray Binary LS I +61° 303".Physical Review Letters 136.18(2026). |
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