155 articles – 1965 Notices  [english version]
 HAL : in2p3-00324687, version 1
 arXiv : 0809.3894
 Code Bibliographique ADS : 2009ApJ...691..175A
 Astrophysical Journal 691 (2009) 175-181
 A search for a dark matter annihilation signal towards the Canis Major overdensity with H.E.S.S
 HESS Collaboration(s)
 (2009)
 A search for a dark matter (DM) annihilation signal into $\gamma$-rays toward the direction of the Canis Major (CMa) overdensity is presented. The nature of CMa is still controversial and one scenario represents it as a dwarf galaxy, making it an interesting candidate for DM annihilation searches. A total of 9.6 hours of high quality data were collected with the H.E.S.S. array of Imaging Atmospheric Cherenkov Telescopes (IACTs) and no evidence for a very high energy $\gamma$-ray signal is found. Upper limits on the CMa dwarf galaxy mass of the order of 10$^{9}$ M$_{\odot}$ are derived at the 95% C.L. assuming neutralino masses in the range 500 GeV - 10 TeV and relatively large annihilation cross-sections. Constraints on the velocity-weighted annihilation cross section $<\sigma v>$, are calculated for specific WIMP scenarios, using a NFW model for the DM halo profile and taking advantage of numerical simulations of hierarchical structure formation. 95% C.L. exclusion limits of the order of 5 $\times$ 10$^{-24}$ cm$^{3}$ s$^{-1}$ are reached in the 500 GeV - 10 TeV DM particle mass interval, assuming a total halo mass of 3 $\times$ 10$^{8}$ M$_{\odot}$.
 équipe(s) de recherche : APC - AHE
 Thème(s) : Physique/Astrophysique/Cosmologie et astrophysique extra-galactiquePlanète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactiquePlanète et Univers/Astrophysique
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0809.3894
 in2p3-00324687, version 1 http://hal.in2p3.fr/in2p3-00324687 oai:hal.in2p3.fr:in2p3-00324687 Contributeur : Simone Lantz <> Soumis le : Jeudi 25 Septembre 2008, 16:32:01 Dernière modification le : Lundi 25 Juin 2012, 12:22:50