Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dmap.conf..471v&link_type=abstract
DARK MATTER IN ASTROPHYSICS AND PARTICLE PHYSICS . Proceedings of the 7th International Heidelberg Conference on Dark 2009 . Hel
Astronomy and Astrophysics
Astronomy
Γ-Ray Astronomy, Dark Matter, Dwarf Galaxies
Scientific paper
A search for a dark matter (DM) annihilation signal into γ-rays towards the direction of the Canis Major (CMa) overdensity has been performed with the HESS telescopes. 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 γ-ray signal was found. Constraints on the velocity-weighted annihilation cross section <σv> 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 × 10-24 cm3 s-1 are reached in the 500 GeV - 10 TeV WIMP mass range.
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