Constraining Dark Matter with Recent Gamma-Ray Observations of Dwarf Spheroidals

Dwarf spheroidal galaxies (dSph) are particularly promising targets in the search for gamma-rays from dark matter annihilation due to their low astrophysical background, high dark matter to baryonic matter ratio, and proximity to the Milky Way. In this work, we estimate the J-factors of 22 dSph for different types of dark matter annihilations: s-wave, p-wave, d-wave, and Sommerfeld-enhanced. We present constraints on the cross sections for these various annihilation types using Fermi-LAT data as analyzed by the publicly available tool MadHAT.v2. We also determine constraints from these dSphs on concrete dark matter models such as the scalar singlet dark matter.