Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.231301
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Funding
- Italian Ministry of Education, University and Research (MIUR) [FIRB-2012-RBFR12PM1F]
- Grants-in-Aid for Scientific Research [15H02086] Funding Source: KAKEN
- ICREA Funding Source: Custom
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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 six years of Fermi Large Area Telescope data processed with the new PASS8 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 less than or similar to 100 GeV annihilating via quark and tau-lepton channels.
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