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题名: Search for a gamma-ray line feature from a group of nearby galaxy clusters with Fermi LAT Pass 8 data
作者: Liang YunFeng(梁云峰)1, 2; Shen, Zhao-Qiang1, 2; Li, Xiang1, 2; Fan YiZhong(范一中)1; Huang, Xiaoyuan3; Lei ShiJun(雷仕俊)1; Feng, Lei1; Liang, En-Wei4; Chang Jin(常进)1
刊名: PHYSICAL REVIEW D
出版日期: 2016-05-20
卷号: 93, 期号:10
DOI: 10.1103/PhysRevD.93.103525
文章类型: Article
英文摘要: Galaxy clusters are the largest gravitationally bound objects in the Universe and may be suitable targets for indirect dark matter searches. With 85 months of Fermi LAT Pass 8 publicly available data, we analyze the gamma-ray emission in the direction of 16 nearby galaxy clusters with an unbinned likelihood analysis. No statistically or globally significant gamma-ray line feature is identified and a tentative line signal may present at similar to 43 GeV. The 95% confidence level upper limits on the velocity-averaged cross section of dark matter particles annihilating into double gamma rays (i.e., sigma nu (chi chi -> gamma gamma)) are derived. Unless very optimistic boost factors of dark matter annihilation in these galaxy clusters have been assumed, such constraints are much weaker than the bounds set by the Galactic gamma-ray data.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]: Astronomy & Astrophysics ; Physics
关键词[WOS]: SUPERSYMMETRIC DARK-MATTER ; EMISSION ; ANNIHILATION ; SIGNAL ; CANDIDATES
收录类别: SCI
项目资助者: National Basic Research Program of China(2013CB837000) ; National Natural Science Foundation of China(11525313 ; Foundation for Distinguished Young Scholars of Jiangsu Province, China(BK2012047) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDA04075500) ; 11103084)
语种: 英语
WOS记录号: WOS:000376259800005
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16215
Appears in Collections:暗物质和空间天文实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100012, Peoples R China
3.Tech Univ Munich, Phys Dept T30d, James Franck Str, D-85748 Garching, Germany
4.Guangxi Univ, Dept Phys, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
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