Search for gamma-ray lines in the Galaxy with DAMPE

被引：0
|
作者：
Xu Zun-Lei [1 ,2 ]
Shen Zhao-Qiang [1 ]
Duan Kai-Kai [1 ]
Li Xiang [1 ]
Mazziotta, M. N. [3 ]
机构：
[1] Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, 10 Yuanhua Rd, Nanjing 210023, Peoples R China
[2] Univ Sci & Technol China, Sch Astron & Space Sci, 96 JinZhai Rd, Hefei 230026, Peoples R China
[3] Ist Nazl Fis Nucl, Sez Bari, I-70125 Bari, Italy
来源：
37TH INTERNATIONAL COSMIC RAY CONFERENCE, ICRC2021 | 2022年
基金：
瑞士国家科学基金会; 欧洲研究理事会; 中国国家自然科学基金;
关键词：
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
DArk Matter Particle Explorer (DAMPE) has a great potential in the search of monochromatic and sharp gamma-ray structures in GeV-TeV range thanks to its good energy resolution. In this work, we search for gamma-ray line structures using 5.0 years of DAMPE data. To improve the sensitivity, we develop two types of data sets and adopt the signal-to-noise ratio optimized regions of interest (ROIs) for different DM density profiles. No line signals or candidates, including those located at 133 GeV and 43 GeV, are found between 10 GeV and 300 GeV in the Galaxy. Therefore we calculate the 95% confidence level constraints on the velocity-averaged cross section for chi chi -> gamma gamma and the decay lifetime for chi -> gamma gamma with systematic uncertainties included. Our constraints on DM parameters are mostly comparable to the Fermi-LAT 5.8-yr results. The lower limit for DM decay lifetime below 100 GeV are better than that of Fermi-LAT.
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页数：9
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