Paper: astro-ph/0601298
Date: Fri, 13 Jan 2006 17:13:59 GMT (82kb)

Title: Indirect Search for Dark Matter in M31 with the CELESTE Experiment

Authors: J. Lavalle, H. Manseri, A. Jacholkowska, E. Brion, R. Britto, P.
Bruel, J. Bussons-Gordo, D. Dumora, E. Durand, E. Giraud, B. Lott, F. M\"unz,
E. Nuss, F. Piron, T. Reposeur and D.A. Smith (for the CELESTE Collaboration)

Comments: Accepted for publication in Astronomy & Astrophysics
\\
If dark matter is made of neutralinos, annihilation of such Majorana
particles should produce high energy cosmic rays, especially in galaxy halo
high density regions like galaxy centres. M31 (Andromeda) is our nearest
neighbour spiral galaxy, and both its high mass and its low distance make it a
source of interest for the indirect search for dark matter through gamma-ray
detection. The ground based atmospheric Cherenkov telescope CELESTE observed
M31 from 2001 to 2003, in the mostly unexplored energy range 50-500 GeV. These
observations provide an upper limit on the flux above 50 GeV around
$10^{-10}\rm{cm}^{-2}\rm{s}^{-1}$ in the frame of supersymmetric dark matter,
and more generally on any gamma emission from M31.

\\ ( http://arXiv.org/abs/astro-ph/0601298 , 82kb)