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题名: Search for gamma-ray emission from eight dwarf spheroidal galaxy candidates discovered in year two of Dark Energy Survey with Fermi-LAT data
作者: Li, Shang1, 2; Liang YunFeng(梁云峰)1, 2; Duan, Kai-Kai1, 2; Shen, Zhao-Qiang1, 2; Huang, Xiaoyuan1, 3; Li, Xiang1, 2; Fan YiZhong(范一中)1; Liao, Neng-Hui1; Feng, Lei1; Chang Jin(常进)1
刊名: PHYSICAL REVIEW D
出版日期: 2016-02-10
卷号: 93, 期号:4
DOI: 10.1103/PhysRevD.93.043518
文章类型: Article
英文摘要: Very recently the Dark Energy Survey (DES) Collaboration has released their second group of dwarf spheroidal (dSph) galaxy candidates. With the publicly available Pass 8 data of Fermi-LAT we search for.-ray emissions from the directions of these eight newly discovered dSph galaxy candidates. No statistically significant gamma-ray signal has been found in the combined analysis of these sources. With the empirically estimated J-factors of these sources, the constraint on the annihilation channel of xx -> tau(+)tau(-) is comparable to the bound set by the joint analysis of fifteen previously known dSphs with kinematically constrained J-factors for the dark matter mass m(x) > 250 GeV. In the direction of Tucana III (DES J2356-5935), one of the nearest dSph galaxy candidates that is similar to 25 kpc away, there is a weak.-ray signal and its peak test statistic (TS) value for the dark matter annihilation channel xx -> tau(+)tau(-1) is approximate to 6.7 at m(x) similar to 15 GeV. The significance of the possible signal likely increases with time. More data is highly needed to pin down the physical origin of such a GeV excess.
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]: MILKY-WAY SATELLITE ; LARGE-AREA TELESCOPE ; SOURCE CATALOG ; 3-PI SURVEY ; MATTER ; FAINT ; SKY
收录类别: SCI
项目资助者: 973 Program of China(2013CB837000) ; National Natural Science Foundation of China(11525313) ; National Natural Fund for Distinguished Young Scholars(10925315 ; Foundation for Distinguished Young Scholars of Jiangsu Province, China(BK2012047) ; Strategic Priority Research Program(XDA04075500) ; 11361140349 ; 11103084)
语种: 英语
WOS记录号: WOS:000369733900002
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16134
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, Yuquan Rd 19, Beijing 100049, Peoples R China
3.Tech Univ Munich, Phys Dept T30d, James Franck Str, D-85748 Garching, Germany
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