Prospects for annihilating dark matter from M31 and M33 observations with the Cherenkov Telescope Array

Abstract M31 and M33 are the closest spiral galaxies largest members (together with Milky Way) of Local group, which makes them interesting targets for indirect dark matter searches. In this paper we present studies expected sensitivity Cherenkov Telescope Array (CTA) to an annihilation signal from weakly interacting massive particles M33. We show that a 100 h long observation campaign will allow CTA probe cross-sections up 〈 συ 〉 ≈ 5·10 -25 cm 3 s -1 τ + - channel (for M31, at DM mass 0.3 TeV), improving current limits derived by HAWC order magnitude. estimate sensitivity, also taking into account contributions astrophysical background other possible sources systematic uncertainty. might be able detect extended emission bulge detected lower energies Fermi /LAT.