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Search for gamma-ray emission from the nearby dwarf spheroidal galaxies with 9 years of Fermi-LAT data
Li, Shang; Duan, Kai-Kai; Liang, Yun-Feng; Xia, Zi-Qing; Shen, Zhao-Qiang; Li, Xiang; Liao, Neng-Hui; Feng, Lei; Yuan, Qiang; Fan, Yi-Zhong; Chang, Jin
2018
发表期刊PHYSICAL REVIEW D
卷号97期号:12页码:122001
摘要In this work, we search for gamma-ray emission from nearby Milky Way dwarf spheroidal galaxies (dSphs) and candidates with the publicly available Pass 8 data of Fermi-LAT. Our sample includes 12 sources with the distances < 50 kpc. Very weak gamma-ray excesses (similar to 2 sigma) are found in some dSphs/candidates, consistent with those reported in the previous literature. Intriguingly, the peak test statistic (TS) value of the weak emission from Reticulum II rises continually. If interpreted as dark matter (DM) annihilation, the peak TS value is 13.5 for the annihilation channel of chi chi -> tau(+)tau(-) and the DM mass of m(chi) similar to 16 GeV. The combination of all these nearby sources yields a more significant (with local significance >4 sigma) gamma-ray signal.
语种英语
WOS记录号WOS:000434630600001
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/17991
专题暗物质和空间天文实验室
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GB/T 7714
Li, Shang,Duan, Kai-Kai,Liang, Yun-Feng,et al. Search for gamma-ray emission from the nearby dwarf spheroidal galaxies with 9 years of Fermi-LAT data[J]. PHYSICAL REVIEW D,2018,97(12):122001.
APA Li, Shang.,Duan, Kai-Kai.,Liang, Yun-Feng.,Xia, Zi-Qing.,Shen, Zhao-Qiang.,...&Chang, Jin.(2018).Search for gamma-ray emission from the nearby dwarf spheroidal galaxies with 9 years of Fermi-LAT data.PHYSICAL REVIEW D,97(12),122001.
MLA Li, Shang,et al."Search for gamma-ray emission from the nearby dwarf spheroidal galaxies with 9 years of Fermi-LAT data".PHYSICAL REVIEW D 97.12(2018):122001.
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