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Title: Strong optimized conservative Fermi-LAT constraints on dark matter models from the inclusive photon spectrum

Here, we set conservative, robust constraints on the annihilation and decay of dark matter into various Standard Model final states under various assumptions about the distribution of the dark matter in the Milky Way halo. We use the inclusive photon spectrum observed by the Fermi Gamma-ray Space Telescope through its main instrument, the Large Area Telescope. We use simulated data to first find the “optimal” regions of interest in the γ-ray sky, where the expected dark matter signal is largest compared with the expected astrophysical foregrounds. We then require the predicted dark matter signal to be less than the observed photon counts in the a priori optimal regions. This yields a very conservative constraint as we do not attempt to model or subtract astrophysical foregrounds. The resulting limits are competitive with other existing limits and, for some final states with cuspy dark-matter distributions in the Galactic Center region, disfavor the typical cross section required during freeze-out for a weakly interacting massive particle to obtain the observed relic abundance.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [4]
  1. Stony Brook Univ., Stony Brook, NY (United States)
  2. Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada)
  3. Stanford Univ., Stanford, CA (United States)
  4. Pontificia Univ. Catolica de Chile, Santiago (Chile); Istituto Nazionale di Fisica Nucleare, Roma (Italy)
Publication Date:
OSTI Identifier:
1355163
Grant/Contract Number:
AC02-76SF00515; SC0008061; PHY1316617; ACT1102; FPA2012-34694
Type:
Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 91; Journal Issue: 8; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS