Searching for γ-ray emission from Reticulum Ⅱ by Fermi-LAT
Recently, many new dwarf spheroidal satellites（dSphs） have been discovered by the Dark Energy Survey（DES）. These dSphs are ideal candidates for probing for gamma-ray emissions from dark matter（DM） annihilation.However, no significant signature has been found by the Fermi-LAT dSph observations. In th...
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| Published in | Chinese physics C Vol. 42; no. 2; pp. 144 - 149 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.02.2018
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| Subjects | |
| Online Access | Get full text |
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| Summary: | Recently, many new dwarf spheroidal satellites（dSphs） have been discovered by the Dark Energy Survey（DES）. These dSphs are ideal candidates for probing for gamma-ray emissions from dark matter（DM） annihilation.However, no significant signature has been found by the Fermi-LAT dSph observations. In this work, we reanalyze the Fermi-LAT Pass 8 data from the direction of Reticulum II, where a slight excess has been reported by some previous studies. We treat Reticulum II（DES J0335.6-5403） as a spatially extended source, and find that no significant gamma-ray signature is observed. Based on this result, we set upper-limits on the DM annihilation cross section. |
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| Bibliography: | Recently, many new dwarf spheroidal satellites（dSphs） have been discovered by the Dark Energy Survey（DES）. These dSphs are ideal candidates for probing for gamma-ray emissions from dark matter（DM） annihilation.However, no significant signature has been found by the Fermi-LAT dSph observations. In this work, we reanalyze the Fermi-LAT Pass 8 data from the direction of Reticulum II, where a slight excess has been reported by some previous studies. We treat Reticulum II（DES J0335.6-5403） as a spatially extended source, and find that no significant gamma-ray signature is observed. Based on this result, we set upper-limits on the DM annihilation cross section. 11-5641/O4 Yi Zhao1,2, Xiao-Jun Bi3,4 ,Peng-Fei Vin3, Xinmin Zhang1,2,4 （1 Theoretical Physics Division, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; 2 Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing 100049, China; 3 Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; 4 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China） dark matter, gamma ray, dwarf galaxy |
| ISSN: | 1674-1137 0254-3052 |
| DOI: | 10.1088/1674-1137/42/2/025102 |