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Issue A&A
Volume 450, Number 1, April IV 2006
Page(s) 1 - 8
Section Astrophysical processes
DOI http://dx.doi.org/10.1051/0004-6361:20054340

A&A 450, 1-8 (2006)
DOI: 10.1051/0004-6361:20054340

Indirect search for dark matter in M 31 with the CELESTE experiment

J. Lavalle1, H. Manseri2, A. Jacholkowska1, E. Brion3, R. Britto1, P. Bruel2, J. Bussons Gordo1, D. Dumora3, E. Durand3, E. Giraud1, B. Lott3, F. Münz4, E. Nuss1, F. Piron1, T. Reposeur3 and D. A. Smith3

1  Laboratoire de Physique Théorique et Astroparticules, CNRS-IN2P3/Université de Montpellier II, 34095 Montpellier, France
    e-mail: lavalle@in2p3.fr
2  Laboratoire Louis Leprince-Ringuet, CNRS-IN2P3/École Polytechnique, 91128 Palaiseau, France
3  Centre d'Etudes Nucléaires de Bordeaux-Gradignan, CNRS-IN2P3, 33175 Bordeaux, France
4  Laboratoire d'Astroparticule et Cosmologie, CNRS-IN2P3/Collège de France, 75231 Paris, France

(Received 11 October 2005 / Accepted 5 January 2006)

Abstract
Context.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.
Aims.M 31 (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.
Methods.The ground based atmospheric Cherenkov telescope CELESTE observed M 31 from 2001 to 2003, in the mostly unexplored energy range 50-500 GeV.
Results.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 M 31.


Key words: gamma ray: observations -- cosmology: dark matter -- galaxies: spiral

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© ESO 2006


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