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Interacting dark matter contribution to the galactic 511 keV gamma ray emission: constraining the morphology with INTEGRAL/SPI observations

Martin, Pierrick; Vincent, Aaron C.; Cline, James M.

We compare the full-sky morphology of the 511 keV gamma ray excess measured by the INTEGRAL/SPI experiment to predictions of models based on dark matter (DM) scatterings that produce low-energy positrons: either MeV-scale DM that annihilates directly into e⁺e^- pairs, or heavy DM that inelastically scatters into an excited sta…