http://arxiv.org/abs/1503.02641
The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some of the most dark matter (DM) dominated objects known. We report on gamma-ray observations of Milky Way dSphs based on 6 years of Fermi Large Area Telescope data processed with the new Pass 8 event-level analysis. None of the dSphs are significantly detected in gamma rays, and we present upper limits on the DM annihilation cross section from a combined analysis of 15 dSphs. These constraints are among the strongest and most robust to date and lie below the canonical thermal relic cross section for DM of mass $\lesssim$ 100 GeV annihilating via quark and $\tau$-lepton channels.
Fermi-LAT Collaboration et. al.
Tue, 10 Mar 15
57/77
Comments: Submitted to PRL. 17 pages, 7 figures, 2 tables. Includes Supplementary Materials. Corresponding Authors: Brandon Anderson, Alex Drlica-Wagner, Matthew Wood
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