298 articles – 2275 Notices  [english version]
 HAL : in2p3-00697553, version 1
 The Astrophysical Journal 747 (2012) 121
 Search for Dark Matter Satellites using the FERMI-LAT
 Fermi-LAT Collaboration(s)
 (2012)
 Numerical simulations based on the Lambda-CDM model of cosmology predict a large number of as yet unobserved Galactic dark matter satellites. We report the results of a Large Area Telescope (LAT) search for these satellites via the gamma-ray emission expected from the annihilation of weakly interacting massive particle (WIMP) dark matter. Some dark matter satellites are expected to have hard gamma-ray spectra, finite angular extents, and a lack of counterparts at other wavelengths. We sought to identify LAT sources with these characteristics, focusing on gamma-ray spectra consistent with WIMP annihilation through the $b \bar b$ channel. We found no viable dark matter satellite candidates using one year of data, and we present a framework for interpreting this result in the context of numerical simulations to constrain the velocity-averaged annihilation cross section for a conventional 100 GeV WIMP annihilating through the $b \bar b$ channel.
 équipe(s) de recherche : ASTRO
 Thème(s) : Physique/Astrophysique/Astrophysique galactiquePlanète et Univers/Astrophysique/Astrophysique galactique
 Mot(s)-clé(s) : dark matter - galaxies: dwarf - gamma rays: galaxies
 in2p3-00697553, version 1 http://hal.in2p3.fr/in2p3-00697553 oai:hal.in2p3.fr:in2p3-00697553 Contributeur : Nathalie Martin <> Déposé pour le compte de : Xian HOU <> Soumis le : Mardi 15 Mai 2012, 15:59:49 Dernière modification le : Mardi 15 Mai 2012, 16:47:39