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题名: 3FGL J1924.8-1034: A spatially extended stable unidentified GeV source?
作者: Xia, Zi-Qing; Duan, Kai-Kai; Li, Shang; Liang, Yun-Feng; Shen, Zhao-Qiang; Yue, Chuan; Wang, Yuan-Peng; Yuan, Qiang; Fan, Yi-Zhong; Wu, Jian; Chang, Jin
刊名: PHYSICAL REVIEW D
出版日期: 2017
卷号: 95, 期号:10, 页码:102001-
英文摘要: Milky Way-like galaxies are predicted to host a very large number of dark matter subhalos. Some massive and nearby subhalos could generate detectable gamma rays, appearing as unidentified, spatially extended and stable gamma-ray sources. We search for such sources in the third Fermi Large Area Telescope source list (3FGL) and report the identification of a new candidate, 3FGL J1924.8-1034. With the Fermi-LAT Pass 8 data, we find that 3FGL J1924.8-1034 is spatially extended at a high confidence level of 5.4 sigma, with a best-fit extension radius of similar to 0.15 degrees. No significant variability has been found and its gammaray spectrum is well fitted by the dark matter annihilation into b (b) over bar with a mass of similar to 43 GeV. All these facts make 3FGL J1924.8-1034 a possible dark matter subhalo candidate. However, due to the limited angular resolution, the possibility of that the spatial extension of 3FGL J1924.8-1034 is caused by the contamination from the other unresolved point source cannot be ruled out.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17448
Appears in Collections:中国科学院紫金山天文台研究生部_学生文章

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