Detection of the Farthest Globular Cluster NGC 6715 and Two Other GCs in Gamma-Rays with Fermi-LAT

作     者：Min Yuan Chongyang Ren Pengfei Zhang Zejun Jiang Li Zhang Min Yuan;Chongyang Ren;Pengfei Zhang;Zejun Jiang;Li Zhang

作者机构：Department of AstronomySchool of Physics and AstronomyKey Laboratory of Astroparticle Physics of Yunnan ProvinceYunnan UniversityKunming 650091China School of Mathematics and StatisticsXianyang Normal UniversityXianyang 712000China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2022年第22卷第11期

页      面：137-146页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported in part by the National Key R&D Program of China under Grant No.2018YFA0404204 the National Natural Science Foundation of China Nos.12163006 and 12233006 the Basic Research Program of Yunnan Province No.202201AT070137 the joint foundation of Department of Science and Technology of Yunnan Province and Yunnan University No.202201BF070001-020 

主　　题：(Galaxy:)globular clusters:individual(NGC6715 NGC1851 NGC6723) 

摘      要：In this paper,~12 yr long-term Pass 8 data from Fermi Large Area Telescope for the 157 globular clusters are carefully *** the 31 globular clusters reported in the fourth Fermi Large Area Telescope catalog Data Release 2,NGC 1851 is identified as a gamma-ray emitter and the significant gamma-ray emissions from NGC 6715 and NGC 6723 are *** NGC 6715 is located at a distance of 26.8 kpc,so far it is the farthest globular cluster detected in gamma-rays.A detailed analysis for these three globular clusters has been performed,but their gamma-ray pulsation emissions or flux variabilities are not *** numbers of millisecond pulsars(MSPs)in these globular clusters are estimated under the assumption that each MSP inside globular clusters emits a similar amount of *** possible origins of gamma-ray emission from globular clusters,such as MSPs,pulsar binary systems and/or dark matter,are discussed.