Abstract
Recent studies show that the GeV gamma-ray excess signal from the Milky Way center can be best explained by \(\sim 40~\mbox{GeV}\) dark matter annihilating via \(b\bar{b}\) channel. However, the recent observations of the nearby Milky Way dwarf spheroidal satellite galaxies by Fermi-LAT and the radio observations of the Milky Way center and the M31 galaxy tend to rule out this proposal. In this article, we discuss the possibility of the dark matter interpretation of the GeV gamma-ray excess by proposing 130 GeV dark matter annihilating via both Higgs and gamma-ray channels. Recent analyses show that dark matter annihilating via Higgs channel can satisfactorily explain the Milky Way GeV gamma-ray excess observed. We show that this model can satisfy the upper limits of the gamma-ray constraint of the Milky Way dwarf spheroidal satellite galaxies and the constraint from the radio observations of the M31 galaxy.
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This work is partially supported by a grant from the Education University of Hong Kong (Project No. RG57/2015-2016R).
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Chan, M.H. Dark matter annihilation via Higgs and gamma-ray channels. Astrophys Space Sci 361, 298 (2016). https://doi.org/10.1007/s10509-016-2895-9
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DOI: https://doi.org/10.1007/s10509-016-2895-9