150 articles – 1930 Notices  [english version]
 HAL : in2p3-00580801, version 1
 arXiv : 1103.3266
 Physical Review Letters 106 (2011) 161301
 Search for a Dark Matter annihilation signal from the Galactic Center halo with H.E.S.S
 HESS Collaboration(s)
 (2011)
 A search for a very-high-energy (VHE; >= 100 GeV) gamma-ray signal from self-annihilating particle Dark Matter (DM) is performed towards a region of projected distance r ~ 45-150 pc from the Galactic Center. The background-subtracted gamma-ray spectrum measured with the High Energy Stereoscopic System (H.E.S.S.) gamma-ray instrument in the energy range between 300 GeV and 30 TeV shows no hint of a residual gamma-ray flux. Assuming conventional Navarro-Frenk-White (NFW) and Einasto density profiles, limits are derived on the velocity-weighted annihilation cross section < \sigma v> as a function of the DM particle mass. These are among the best reported so far for this energy range. In particular, for the DM particle mass of ~1 TeV, values for <\sigma v> above 3 * 10^(-25) cm^3 s^(-1) are excluded for the Einasto density profile. The limits derived here differ much less for the chosen density profile parametrizations, as opposed to limits from gamma-ray observations of dwarf galaxies or the very center of the Milky Way, where the discrepancy is significantly larger.
 équipe(s) de recherche : APC - AHE
 Thème(s) : Physique/Astrophysique/Phénomènes cosmiques de haute energiePlanète et Univers/Astrophysique/Phénomènes cosmiques de haute energiePhysique/Physique des Hautes Energies - Phénoménologie
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1103.3266
 in2p3-00580801, version 1 http://hal.in2p3.fr/in2p3-00580801 oai:hal.in2p3.fr:in2p3-00580801 Contributeur : Nicole Berger <> Soumis le : Mardi 29 Mars 2011, 12:12:43 Dernière modification le : Mardi 26 Juin 2012, 14:50:21