HAL : in2p3-00528694, version 1

arXiv : 1002.2239

DOI : 10.1088/1475-7516/2010/05/025

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Journal of Cosmology and Astroparticle Physics (2010) 025

Constraints on Dark Matter Annihilation in Clusters of Galaxies with the Fermi Large Area Telescope

M. Ackermann, M. Ajello, A. Allafort, L. Baldini, J. Ballet1, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, R.D. Blandford, E.D. Bloom, E. Bonamente, A.W. Borgland, A. Bouvier, T.J. Brandt2, J. Bregeon, M. Brigida, P. Bruel3, R. Buehler, S. Buson, G.A. Caliandro, R.A. Cameron, P.A. Caraveo, S. Carrigan, J.M. Casandjian1, C. Cecchi, E. Charles, A. Chekhtman, C.C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi4, L.R. Cominsky, J. Conrad, A. De Angelis, F. De Palma, E. Do Couto E Silva, P.S. Drell, A. Drlica-Wagner, R. Dubois, D. Dumora5, Y. Edmonds, C. Farnier4, C. Favuzzi, S.J. Fegan3, M. Frailis, Y. Fukazawa, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, T. Glanzman, G. Godfrey, I.A. Grenier, S. Guiriec, M. Gustafsson, A.K. Harding, M. Hayashida, D. Horan3, R.E. Hughes, T.E. Jeltema, G. Jóhannesson, A. S. Johnson, W.N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Knödlseder2, M. Kuss, J. Lande, L. Latronico, S.-H. Lee, M. Llena Garde, F. Longo, F. Loparco, M.N. Lovellette, P. Lubrano, G.M. Madejski, A. Makeev, M.N. Mazziotta, P.F. Michelson, W. Mitthumsiri, T. Mizuno, A.A. Moiseev, C. Monte, M.E. Monzani, A. Morselli, I.V. Moskalenko, S. Murgia, P.L. Nolan, J.P. Norris, E. Nuss4, M. Ohno, T. Ohsugi, N. Omodei, E. Orlando, J.F. Ormes, J.H. Panetta, M. Pepe, M. Pesce-Rollins, F. Piron4, T.A. Porter, S. Profumo, S. Rainò, M. Razzano, T. Reposeur5, S. Ritz, A.Y. Rodriguez, M. Roth, H.F.-W. Sadrozinski, A. Sander, J.D. Scargle, C. Sgrò, E.J. Siskind, P.D. Smith, G. Spandre, P. Spinelli, J.-L. Starck1, M.S. Strickman, D.J. Suson, H. Takahashi, T. Tanaka, J.B. Thayer, J.G. Thayer, L. Tibaldo1, D.F. Torres, G. Tosti, T.L. Usher, V. Vasileiou, V. Vitale, A.P. Waite, P. Wang, B.L. Winer, K.S. Wood, Z. Yang, T. Ylinen, And M. Ziegle

Fermi-LAT Collaboration(s)

(05/2010)

Nearby clusters and groups of galaxies are potentially bright sources of high-energy gamma-ray emission resulting from the pair-annihilation of dark matter particles. However, no significant gamma-ray emission has been detected so far from clusters in the first 11 months of observations with the Fermi Large Area Telescope. We interpret this non-detection in terms of constraints on dark matter particle properties. In particular for leptonic annihilation final states and particle masses greater than ~200 GeV, gamma-ray emission from inverse Compton scattering of CMB photons is expected to dominate the dark matter annihilation signal from clusters, and our gamma-ray limits exclude large regions of the parameter space that would give a good fit to the recent anomalous Pamela and Fermi-LAT electron-positron measurements. We also present constraints on the annihilation of more standard dark matter candidates, such as the lightest neutralino of supersymmetric models. The constraints are particularly strong when including the fact that clusters are known to contain substructure at least on galaxy scales, increasing the expected gamma-ray flux by a factor of ~5 over a smooth-halo assumption. We also explore the effect of uncertainties in cluster dark matter density profiles, finding a systematic uncertainty in the constraints of roughly a factor of two, but similar overall conclusions. In this work, we focus on deriving limits on dark matter models; a more general consideration of the Fermi-LAT data on clusters and clusters as gamma-ray sources is forthcoming.

1 :	AIM - Astrophysique Interactions Multi-échelles
2 :	CESR - Centre d'étude spatiale des rayonnements
3 :	LLR - Laboratoire Leprince-Ringuet
4 :	LPTA - Laboratoire de Physique Théorique et Astroparticules
5 :	CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan

Thème(s)

:

Physique/Astrophysique/Phénomènes cosmiques de haute energie Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie

Mot(s)-clé(s) : gamma ray experiments – galaxy clusters – supersymmetry and cosmology – dark energy theory

in2p3-00528694, version 1

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Contributeur : Virginie Mas <>

Déposé pour le compte de : David Smith <>

Soumis le : Vendredi 22 Octobre 2010, 12:17:16

Dernière modification le : Vendredi 22 Octobre 2010, 14:18:54