Constraints on decaying dark matter from<i>XMMNewton</i>observations of M31
Constraints on decaying dark matter from<i>XMMNewton</i>observations of M31
We derive constraints on the parameters of the radiatively decaying dark matter (DM) particle, using the XMM–Newton EPIC spectra of the Andromeda galaxy (M31). Using the observations of the outer (5–13 arcmin) parts of M31, we improve the existing constraints. For the case of sterile neutrino DM, combining our constraints …