Detectability of dark matter subhalos by means of the GAMMA-400 telescope

Abstract

We investigated the detectability of Galactic subhalos with masses $(10^6-10^9)M_{\odot }$ formed by annihilating WIMP dark matter by the planned GAMMA-400 gamma-ray telescope. The inner structure of dark matter subhalos and their distribution in the Galaxy were taken from corresponding simulations. We showed that the expected gamma-ray flux from subhalos strongly depends on WIMP mass and subhalo concentration, but less strongly depends on the subhalo mass. In an optimistic case we may expect the flux of 10-100 ph/year above 100 MeV from the closest and most massive subhalos, which would be detectable sources for GAMMA-400. However, resolving the inner structure of subhalos might be possible only by the joint analysis of the future GAMMA-400 data and data from other telescopes due to smallness of fluxes. Also we considered the recent subhalo candidates 3FGL J2212.5+0703 and J1924.8-1034 within the framework of our model. We concluded that it is very unlikely that these sources belong to the subhalo population.

arXiv commentWas presented at International Symposium on Cosmic Rays and Astrophysics (ISCRA-2017), 20-22 June 2017, Moscow, Russia

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Cited by in corpus (7)

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• Entering the Era of Dark Matter Astronomy? Near to Long-Term Forecasts in X-Ray and Gamma-Ray Bands
• $\gamma$-ray and $\nu$ searches for dark matter subhalos in the Milky Way with a baryonic potential
• Investigating the detection of dark matter subhalos as extended sources with Fermi-LAT
• Constraints to dark matter annihilation from high-latitude HAWC unidentified sources
• Nature of M31 gamma-ray halo in relation to dark matter annihilation