Anisotropies in the Diffuse Gamma-Ray Background from Dark Matter with Fermi LAT: a closer look
| Autor: | Cuoco, A., Sellerholm, A., Conrad, J., Hannestad, S. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, Volume 414, Issue 3, pp. 2040-2054 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2011.18525.x |
| Popis: | 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) Comment: 17 pages, 9 figures, v2: added discussion on unresolved point sources, matches published version on MNRAS |
| Databáze: | arXiv |
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