Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-05-05
Monthly Notices of the Royal Astronomical Society, Volume 414, Issue 3, pp. 2040-2054
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
17 pages, 9 figures, v2: added discussion on unresolved point sources, matches published version on MNRAS
Scientific paper
10.1111/j.1365-2966.2011.18525.x
We perform a detailed study of the sensitivity to the anisotropies related to Dark Matter (DM) annihilation in the Isotropic Gamma-Ray Background (IGRB) as measured by the Fermi Large Area Telescope (Fermi-LAT). For the first time, we take into account the effects of the Galactic foregrounds and use a realistic representation of the Fermi-LAT. We consider DM anisotropies of extra-galactic origin and of Galactic origin (which can be generated through annihilation in the Milky Way sub-structures) as opposed to a background of anisotropies generated by sources of astrophysical origin, blazars for example. We find that with statistics from 5 years of observation Fermi is sensitive to a DM contribution at the level of the thermal-relic cross section depending on the DM mass and annihilation mode. The anisotropy method for DM searches has a sensitivity comparable to the usual methods based only on the energy spectrum and thus constitutes an independent and complementary piece of information in the DM puzzle. (abridged)
Conrad Jan
Cuoco Alessandro
Hannestad Steen
Sellerholm Alexander
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