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Dark matter (DM) can give observable effects decaying or annihilating withproduction of electrons or/and photons. Such probability was widely researchedfor our Galaxy. Here we consider one aspect of similar effect for Andromedagalaxy. We explicitly estimate the energy of the photon of the mediumexperiencing Inverse Compton (IC) scattering off electron in halo. Thesephotons can be registered by different experiments. Dark matter annihilation ordecay could be the source of high energy electrons in halo, though the sourcecould be of other origins too (e.g. running neutron stars). Because ofspecifics in space orientation of Andromeda galaxy disk (a little inclined tothe line of sight), the difference in energies could arise for the photons fromtwo hemispheres of Andromeda halo. It is obtained that such asymmetry can be atthe level of several 10%.

Theoretical indication of a possible asymmetry in gamma-radiation  between Andromeda halo hemispheres due to Compton scattering on electrons  from their hypothetical sources in the halo