Constraints on the dark matter annihilation from Fermi-LAT observation of M31
作者： Xiaoyuan Huang , Qiang Yuan , Zhengwei Li , Yupeng Xu
DOI: 10.1088/1475-7516/2016/12/028
关键词:
摘要: Gamma-ray is a good probe of dark matter (DM) particles in the Universe. We search for DM annihilation signals direction Andromeda galaxy (M31) using 7.5 year Fermi-LAT pass 8 data. Similar to Pshirkov et al. (2016), we find that there residual excess emission from M31 if only galactic disk as traced by far infrared considered. Adding point-like source will improve fitting effectively, although additional slight improvements can be found an extended component such uniform or two bubbles added instead. Taking plus point background model, strong degeneracy between and 10s GeV mass main halo with quark final state. However, required cross section about $10^{-25}-10^{-24}$ cm$^3$s$^{-1}$, orders magnitude larger than constraints observations dwarf spheroidal galaxies, indicating non-DM origin emission. If subhalos are taken into account, broken. When considering enhancement subhalos, on model parameters comparable (or slightly weaker than) those population galaxies. also discuss inverse Compton scattering induced electrons/positrons. For first time include energy dependent template (i.e., cube) data analysis take account effect diffusion charged particles. significant improvement high range after
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