Fermi-LAT constraints on diffuse Dark Matter annihilation from the Galactic Halo

Understand

Our Galaxy resides in the center of a vast "Halo" of Dark Matter (DM).

• This concentration produces, in many viable particle physics models, an indirect Weakly Interacting Massive Particle (WIMP) annihilation signal that peaks in the Fermi-LAT's energy range.
• Our knowledge of the diffuse background is essential to placing reasonable limits on the DM mass and cross-section.
• We incorporate a systematic variation of the GALPROP galactic diffuse background model, constrained by current cosmic-ray measurements, into a profile likelihood analysis and present preliminary upper limits on the DM annihilation cross-section using the Fermi-LAT data.