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Exclusion of Canonical Weakly Interacting Massive Particles by Joint Analysis of Milky Way Dwarf Galaxies with Data from the Fermi Gamma-Ray Space Telescope

Alex Geringer-Sameth and Savvas M. Koushiappas
Phys. Rev. Lett. 107, 241303 – Published 8 December 2011
Physics logo See Synopsis: Gamma Rays Carry No Trace of Dark Matter
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Abstract

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 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 weakly interacting massive particle candidates annihilating into bb¯ with a 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 τ+τ, these limits become 19, 13, and 80 GeV, respectively.

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  • Received 14 August 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.241303

© 2011 American Physical Society

Synopsis

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Gamma Rays Carry No Trace of Dark Matter

Published 8 December 2011

The observation of nearby galaxies provides new and stronger limits on dark matter.

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Authors & Affiliations

Alex Geringer-Sameth* and Savvas M. Koushiappas

  • Department of Physics, Brown University, 182 Hope Street, Providence, Rhode Island 02912, USA

  • *alex_geringer-sameth@brown.edu
  • koushiappas@brown.edu

See Also

Constraining Dark Matter Models from a Combined Analysis of Milky Way Satellites with the Fermi Large Area Telescope

M. Ackermann et al. (The Fermi-LAT Collaboration)
Phys. Rev. Lett. 107, 241302 (2011)

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Vol. 107, Iss. 24 — 9 December 2011

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