Alex Geringer-Sameth, Savvas M. Koushiappas
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.
View original:
http://arxiv.org/abs/1108.2914
No comments:
Post a Comment