Searches for Galactic Dark Matter Substructure with the Fermi LAT

Large mass-to-light ratios and low astrophysical backgrounds make dwarf spheroidal galaxies (dSphs) one of the most promising targets for dark matter (DM) searches via γ rays. We derive robust constraints on the DM annihilation cross section from a combined analysis of ten dSphs. These constraints are applied to super-symmetric DM particle models derived from a phenomenological scan of the MSSM. We derive additional constraints from searches for spatially extended, hard-spectrum γ-ray sources lacking counterparts in other wavelengths, since they may be associated with DM substructures predicted from simulations.