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Upper Limit for γ‐Ray Emission above 140 GeV from the Dwarf Spheroidal Galaxy Draco

2008; IOP Publishing; Volume: 679; Issue: 1 Linguagem: Inglês

10.1086/529135

1538-4357

J. Albert, E. Aliu, H. Anderhub, P. Antoranz, Michael Backes, C. Baixeras, J. A. Barrio, H. Bartko, D. Bastieri, J. K. Becker, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, R. K. Böck, P. Bordas, V. Bosch‐Ramon, T. Bretz, I. Britvitch, Montaña Cámara, E. Carmona, A. Chilingarian, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, V. Curtef, V. Danielyan, F. Dazzi, A. De Angelis, C. Delgado Mendez, R. de los Reyes, B. De Lotto, Mónica María, F. De Sabata, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, M. Fuchs, N. Galante, R. J. Garcı́a López, M. Garczarczyk, M. Gaug, F. Göebel, D. Hakobyan, M. Hayashida, T. Hengstebeck, A. Herrero, D. Höhne, J. Hose, Stefan Huber, C. C. Hsu, P. Jacoń, T. Jogler, R. Kosyra, D. Kranich, A. Laille, E. Lindfors, S. Lombardi, F. Longo, Marcos López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, M. Mariotti, M. Martı́nez, D. Mazin, C. Merck, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninković, E. de Oña Wilhelmi, A. N. Otte, R. Mirzoyan, M. Panniello, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, Felicitas Pauss, R. Pegna, M. A. Pérez‐Torres, M. Persic, L. Peruzzo, A. Piccioli, F. Prada, E. Prandini, N. Puchades, A. Raymers, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, A. Saggion, T. Saito, A. Sánchez, M. Sánchez‐Conde, P. Sartori, V. Scalzotto, V. Scapin, R. Schmitt, T. Schweizer, M. Shayduk, Kenji Shinozaki, S. N. Shore, N. Sidro, A. Sillanpää, D. Sobczyńska, F. Spanier, A. Stamerra, L. S. Stark, L. O. Takalo, P. Temnikov, D. Tescaro, M. Teshima, D. F. Torres, N. Turini, H. Vankov, A. Venturini, V. Vitale, Robert Wagner, W. Wittek, F. Zandanel, R. Zanin, J. Zapatero,

Astrophysics and Cosmic Phenomena

The nearby dwarf spheroidal galaxy Draco, with its high mass to light ratio, is one of the most auspicious targets for indirect dark matter (DM) searches. Annihilation of hypothetical DM particles can result in high-energy γ-rays, e.g., from neutralino annihilation in the supersymmetric framework. A search for a possible DM signal originating from Draco was performed with the MAGIC telescope during 2007. Analysis of the data results in a flux upper limit (2 σ) of 1.1 × 10−11 photons cm−2 s−1 for photon energies above 140 GeV, assuming a pointlike source. A comparison with predictions from supersymmetric models is also given. While our results do not constrain the mSUGRA phase parameter space, a very high flux enhancement can be ruled out.