Search for Gamma-Ray Emission from DES Dwarf Spheroidal Galaxy
  Candidates with Fermi-LAT Data
  Due to their proximity, high dark-matter content, and apparent absence of
non-thermal processes, Milky Way dwarf spheroidal satellite galaxies (dSphs)
are excellent targets for the indirect detection of dark matter. Recently,
eight new dSph candidates were discovered using the first year of data from the
Dark Energy Survey (DES). We searched for gamma-ray emission coincident with
the positions of these new objects in six years of Fermi Large Area Telescope
data. We found no significant excesses of gamma-ray emission. Under the
assumption that the DES candidates are dSphs with dark matter halo properties
similar to the known dSphs, we computed individual and combined limits on the
velocity-averaged dark matter annihilation cross section for these new targets.
If the estimated dark-matter content of these dSph candidates is confirmed,
they will constrain the annihilation cross section to lie below the thermal
relic cross section for dark matter particles with masses < 20 GeV annihilating
via the b-bbar or tau+tau- channels.
