Chinese Physics C > 2018, Vol. 42 > Issue(2): 025102 DOI: 10.1088/1674-1137/42/2/025102

Searching for γ-ray emission from Reticulum Ⅱ by Fermi-LAT

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
5.
Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
6.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
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.
- dark matter,
- gamma ray,
- dwarf galaxy

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Yi Zhao, Xiao-Jun Bi, Peng-Fei Yin and Xinmin Zhang. Searching for γ-ray emission from Reticulum Ⅱ by Fermi-LAT[J]. Chinese Physics C, 2018, 42(2): 025102. doi: 10.1088/1674-1137/42/2/025102

Yi Zhao, Xiao-Jun Bi, Peng-Fei Yin and Xinmin Zhang. Searching for γ-ray emission from Reticulum Ⅱ by Fermi-LAT[J]. Chinese Physics C, 2018, 42(2): 025102. doi:10.1088/1674-1137/42/2/025102 shu

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Received: 2017-11-02

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Supported by National Natural Science Foundation of China (11121092, 11033005, 11375202, 11475191, 11475189), the CAS pilot B program (XDB23020000) and the National Key Program for Research and Development (2016YFA0400200)

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沈阳化工大学材料科学与工程学院沈阳 110142

Searching for γ-ray emission from Reticulum Ⅱ by Fermi-LAT

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