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The mass to luminosity ratio of the dwarf satellite galaxies in the Milky Waysuggests that these dwarf galaxies may contain substantial dark matter. Thedark matter at the dense region such as within or at the vicinity of thecentres of these dwarf galaxies may undergo the process of self annihilationand produce $\gamma$-rays as the end product. The satellite borne $\gamma$-raytelescope such as Fermi-LAT reported the detection of $\gamma$-rays from around45 Dwarf Spheroidals (dSphs) of Milky Way. In this work, we consider particledark matter models described in the literature and after studying theirphenomenologies, we calculate the $\gamma$-ray fluxes from the selfannihilation of the dark matter within the framework of these models in case ofeach of these 45 dSphs. we then compare the computed results with theobservational upper bounds for $\gamma$-ray flux reported by Fermi-LAT and DarkEnergy Survey (DES) for each of the 45 dSphs. The fluxes are calculated byadopting different dark matter density profiles. We then extend similaranalysis for the observational upper bounds given by Fermi-LAT for thecontinuum $\gamma$-ray fluxes originating from extragalactic sources.

monthly notices of the royal astronomical society

Addressing $\gamma$-ray emissions from dark matter annihilations in 45  milky way satellite galaxies and in extragalactic sources with particle dark  matter models