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Discovery of the Ultrahigh-energy Gamma-Ray Source LHAASO J2108+5157

文献类型：期刊论文

作者Cao, Zhen1,2,3; Aharonian, F.4,5; An, Q.6,7; Axikegu8; Bai, L. X.9; Bai, Y. X.1,3; Bao, Y. W.10; Bastieri, D.11; Bi, X. J.1,2,3; Bi, Y. J.1,3
刊名ASTROPHYSICAL JOURNAL LETTERS
出版日期2021-10
卷号919期号:2
ISSN号2041-8205
关键词Gamma-ray astronomy Gamma-ray sources Gamma-ray observatories
DOI10.3847/2041-8213/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
WOS关键词LARGE-AREA TELESCOPE ; MOLECULAR CLOUDS ; EMISSION
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)
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/24577]  
专题星系类星体研究组
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.Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, 100049 Beijing, People's Republic of China; wusha@ihep.ac.cn;
2.University of Chinese Academy of Sciences, 100049 Beijing, People's Republic of China;
3.TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, People's Republic of China; chensz@ihep.ac.cn, licong@ihep.ac.cn, Xi_Shao_Qiang@hotmail.com;
4.Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, 2 Dublin, Ireland;
5.Max-Planck-Institut for Nuclear Physics, P.O. Box 103980, D-69029 Heidelberg, Germany;
6.State Key Laboratory of Particle Detection and Electronics, People's Republic of China;
7.University of Science and Technology of China, 230026 Hefei, Anhui, People's Republic of China;
8.School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, 610031 Chengdu, Sichuan, People's Republic of China; ylxin@swjtu.edu.cn;
9.College of Physics, Sichuan University, 610065 Chengdu, Sichuan, People's Republic of China;
10.School of Astronomy and Space Science, Nanjing University, 210023 Nanjing, Jiangsu, 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).

入库方式： OAI收割

来源：云南天文台

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