Fermi Gamma-ray Haze via Dark Matter and Millisecond Pulsars

Understand

We study possible astrophysical and dark matter (DM) explanations for the Fermi gamma-ray haze in the Milky Way halo.

• As representatives of various DM models, we consider DM particles annihilating into W+W-, b-bbar, and e+e-.
• In the first two cases, the prompt gamma-ray emission from DM annihilations is significant or even dominant at E > 10 GeV, while inverse Compton scattering (ICS) from annihilating DM products is insignificant.
• For the e+e- annihilation mode, we require a boost factor of order 100 to get significant contribution to the gamma-ray haze from ICS photons.