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Search for gamma-ray emission from eight dwarf spheroidal galaxy candidates discovered in year two of Dark Energy Survey with Fermi-LAT data
Li, Shang1,2; Liang, Yun-Feng1,2; Duan, Kai-Kai1,2; Shen, Zhao-Qiang1,2; Huang, Xiaoyuan1,3; Li, Xiang1,2; Fan, Yi-Zhong1; Liao, Neng-Hui1; Feng, Lei1; Chang, Jin1
2016-02-10
Source PublicationPHYSICAL REVIEW D
Volume93Issue:4
AbstractVery 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 HeadingsScience & Technology ; Physical Sciences
DOI10.1103/PhysRevD.93.043518
WOS KeywordMILKY-WAY SATELLITE ; LARGE-AREA TELESCOPE ; SOURCE CATALOG ; 3-PI SURVEY ; MATTER ; FAINT ; SKY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000369733900002
Citation statistics
Cited Times:51[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16134
Collection暗物质和空间天文实验室
Affiliation1.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
Recommended Citation
GB/T 7714
Li, Shang,Liang, Yun-Feng,Duan, Kai-Kai,et al. Search for gamma-ray emission from eight dwarf spheroidal galaxy candidates discovered in year two of Dark Energy Survey with Fermi-LAT data[J]. PHYSICAL REVIEW D,2016,93(4).
APA Li, Shang.,Liang, Yun-Feng.,Duan, Kai-Kai.,Shen, Zhao-Qiang.,Huang, Xiaoyuan.,...&Chang, Jin.(2016).Search for gamma-ray emission from eight dwarf spheroidal galaxy candidates discovered in year two of Dark Energy Survey with Fermi-LAT data.PHYSICAL REVIEW D,93(4).
MLA Li, Shang,et al."Search for gamma-ray emission from eight dwarf spheroidal galaxy candidates discovered in year two of Dark Energy Survey with Fermi-LAT data".PHYSICAL REVIEW D 93.4(2016).
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