A Multi-frequency analysis of possible Dark Matter Contributions to M31 Gamma-Ray Emissions

Understand

We examine the possibility of a dark matter (DM) contribution to the recently observed gamma-ray spectrum seen in the M31 galaxy.

• In particular, we apply limits on Weakly Interacting Massive Particle DM annihilation cross-sections derived from the Coma galaxy cluster and the Reticulum II dwarf galaxy to determine the maximal flux contribution by DM annihilation to both the M31 gamma-ray spectrum and that of the Milky-Way galactic centre.
• We limit the energy range between 1 and 12 GeV in M31 and galactic centre spectra due to the limited range of former's data, as well as to encompass the high-energy gamma-ray excess observed in the latter target.
• In so doing, we will make use of Fermi-LAT data for all mentioned targets, as well as diffuse radio data for the Coma cluster.