Exclusion of canonical WIMPs by the joint analysis of Milky Way dwarfs with Fermi

Details Exclusion of canonical WIMPs by the joint analysis of Milky Way dwarfs with Fermi Exclusion of canonical WIMPs by the joint analysis of Milky Way dwarfs with Fermi

2011-08-15

arxiv.org/abs/1108.2914v2

Phys. Rev. Lett. 107, 241303 (2011)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 2 figures, 2 supplementary figures

Scientific paper

10.1103/PhysRevLett.107.241303

Dwarf spheroidal galaxies are known to be excellent targets for the detection of annihilating dark matter. We present new limits on the annihilation cross section of Weakly Interacting Massive Particles (WIMPs) based on the joint analysis of seven Milky Way dwarfs using a frequentist Neyman construction and Pass 7 data from the Fermi Gamma-ray Space Telescope. We exclude generic WIMP candidates annihilating into b-bbar with mass less than 40 GeV that reproduce the observed relic abundance. To within 95% systematic errors on the dark matter distribution within the dwarfs, the mass lower limit can be as low as 19 GeV or as high as 240 GeV. For annihilation into tau+tau- these limits become 19 GeV, 13 GeV, and 80 GeV respectively.

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