Discovery of the Ultrahigh-energy Gamma-Ray Source LHAASO J2108+5157 | |
Cao, Zhen30,31,32; Aharonian, F.28,29; An, Q.26,27; Axikegu25; Bai, L. X.24; Bai, Y. X.30,32; Bao, Y. W.23; Bastieri, D.22; Bi, X. J.30,31,32; Bi, Y. J.30,32 | |
刊名 | ASTROPHYSICAL JOURNAL LETTERS |
2021-10 | |
卷号 | 919期号:2 |
关键词 | Gamma-ray astronomy Gamma-ray sources Gamma-ray observatories |
ISSN号 | 2041-8205 |
DOI | 10.3847/2041-8213/ac2579 |
产权排序 | 第29完成单位 |
文献子类 | Article |
英文摘要 | We report the discovery of an ultrahigh-energy (UHE) gamma-ray source, LHAASO J2108+5157, by analyzing the LHAASO-KM2A data of 308.33 live days. A significant excess of gamma ray-induced showers is observed in both energy bands of 25-100 and >100 TeV with 9.5 sigma and 8.5 sigma, respectively. This source is not significantly favored as an extended source with an angular extension smaller than the point-spread function of KM2A. The measured energy spectrum from 20 to 200 TeV can be approximately described by a power-law function with an index of -2.83 +/- 0.18(stat). A harder spectrum is demanded at lower energies considering the flux upper limit set by Fermi-LAT observations. The position of the gamma-ray emission is correlated with a giant molecular cloud, which favors a hadronic origin. No obvious counterparts have been found, and deeper multiwavelength observations will help to cast new light on this intriguing UHE source. |
学科主题 | 天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
资助项目 | National Key R&D program of China[2018YFA0404201] ; National Key R&D program of China[2018YFA0404202] ; National Key R&D program of China[2018YFA0404203] ; National Key R&D program of China[2018YFA0404204] ; NSFCNational Natural Science Foundation of China (NSFC)[12022502] ; NSFCNational Natural Science Foundation of China (NSFC)[11905227] ; NSFCNational Natural Science Foundation of China (NSFC)[11635011] ; NSFCNational Natural Science Foundation of China (NSFC)[U1931112] ; NSFCNational Natural Science Foundation of China (NSFC)[11905043] ; NSFCNational Natural Science Foundation of China (NSFC)[U1931111] ; Thailand Science Research and Innovation[RTA6280002] ; Chengdu Management Committee of Tianfu New Area ; Natural Sciences and Engineering Research CouncilNatural Sciences and Engineering Research Council of Canada (NSERC) |
WOS关键词 | LARGE-AREA TELESCOPE ; MOLECULAR CLOUDS ; EMISSION |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000702104200001 |
资助机构 | National Key R&D program of China[2018YFA0404201, 2018YFA0404202, 2018YFA0404203, 2018YFA0404204] ; NSFCNational Natural Science Foundation of China (NSFC)[12022502, 11905227, 11635011, U1931112, 11905043, U1931111] ; Thailand Science Research and Innovation[RTA6280002] ; Chengdu Management Committee of Tianfu New Area ; Natural Sciences and Engineering Research CouncilNatural Sciences and Engineering Research Council of Canada (NSERC) |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/24577] |
专题 | 云南天文台_高能天体物理研究组 |
通讯作者 | Chen, S. H. |
作者单位 | 1.National Space Science Center, Chinese Academy of Sciences, 100190 Beijing, People's Republic of China 2.Moscow Institute of Physics and Technology, 141700 Moscow, Russia; 3.Department of Physics, Faculty of Science, Mahidol University, 10400 Bangkok, Thailand; 4.Yunnan Observatories, Chinese Academy of Sciences, 650216 Kunming, Yunnan, People's Republic of China; 5.Tsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University, 200240 Shanghai, People's Republic of China; 6.School of Physical Science and Technology, Guangxi University, 530004 Nanning, Guangxi, People's Republic of China; 7.School of Physics, Peking University, 100871 Beijing, People's Republic of China; 8.Institute for Nuclear Research of Russian Academy of Sciences, 117312 Moscow, Russia; 9.School of Physics and Microelectronics, Zhengzhou University, 450001 Zhengzhou, Henan, People's Republic of China; 10.Department of Engineering Physics, Tsinghua University, 100084 Beijing, People's Republic of China; |
推荐引用方式 GB/T 7714 | Cao, Zhen,Aharonian, F.,An, Q.,et al. Discovery of the Ultrahigh-energy Gamma-Ray Source LHAASO J2108+5157[J]. ASTROPHYSICAL JOURNAL LETTERS,2021,919(2). |
APA | Cao, Zhen.,Aharonian, F..,An, Q..,Axikegu.,Bai, L. X..,...&Zuo, X..(2021).Discovery of the Ultrahigh-energy Gamma-Ray Source LHAASO J2108+5157.ASTROPHYSICAL JOURNAL LETTERS,919(2). |
MLA | Cao, Zhen,et al."Discovery of the Ultrahigh-energy Gamma-Ray Source LHAASO J2108+5157".ASTROPHYSICAL JOURNAL LETTERS 919.2(2021). |
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