Indirect dark matter searches in the dwarf satellite galaxy Ursa Major II with the MAGIC telescopes

/ Authors

M. L. Ahnen, S. Ansoldi, L. A. Antonelli, C. Arcaro, D. Baack, A. Babi'c, B. Banerjee, P. Bangale, U. D. Almeida, J. Barrio

and 225 more authors

J. Gonz'alez, W. Bednarek, E. Bernardini, R. Berse, A. Berti, W. Bhattacharyya, A. Biland, O. Blanch, G. Bonnoli, R. Carosi, A. Carosi, G. Ceribella, A. Chatterjee, S. M. Colak, P. Colin, E. Colombo, J. Contreras, J. Cortina, S. Covino, P. Cumani, P. D. Vela, F. Dazzi, A. Angelis, B. Lotto, M. Delfino, J. Delgado, F. Pierro, A. Domínguez, D. Prester, D. Dorner, M. Doro, S. Einecke, D. Elsaesser, V. Ramazani, A. Fern'andez-Barral, D. Fidalgo, M. Fonseca, L. Font, C. Fruck, D. Galindo, R. L'opez, M. Garczarczyk, M. Gaug, P. Giammaria, N. Godinovi'c, D. Góra, D. Guberman, D. Hadasch, A. Hahn, T. Hassan, M. Hayashida, J. Herrera, J. Hose, D. Hrupec, K. Ishio, Y. Konno, H. Kubo, J. Kushida, D. Kuvevzdi'c, D. Lelas, E. Lindfors, S. Lombardi, F. Longo, M. L'opez, C. Maggio, P. Majumdar, M. Makariev, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Mart'inez, S. Masuda, D. Mazin, K. Mielke, M. Minev, J. Miranda, R. Mirzoyan, A. Moralejo, V. Moreno, E. Moretti, T. Nagayoshi, V. Neustroev, A. Niedźwiecki, M. Rosillo, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogu'es, S. Paiano, J. Palacio, D. Paneque, R. Paoletti, J. Paredes, G. Pedaletti, Michele Peresano, M. Persic, P. Moroni, E. Prandini, I. Puljak, J. Garcia, I. Reichardt, W. Rhode, M. Rib'o, J. Rico, C. Righi, A. Rugliancich, T. Saito, K. Satalecka, T. Schweizer, J. Sitarek, I. vSnidari'c, D. Sobczynska, A. Stamerra, M. Strzys, T. Suri'c, M. Takahashi, L. Takalo, F. Tavecchio, P. Temnikov, T. Terzi'c, M. Teshima, N. Torres-Albà, A. Treves, S. Tsujimoto, G. Vanzo, M. Acosta, I. Vovk, J. Ward, M. Will, D. Zari'c, E. Zurich, I. F. Physics, Zurich, Switzerland., U. Udine, Infn, Sezione di Trieste, Italy., Udine, I. I. F. Astrophysics, Roma, D. D. F. dell'Universita, S. Infn, Padova, Technische Universitat Dortmund, Dortmund, H Germany, Croatian Magic Consortium Rudjer Boskovic Institute, University of Rijeka, U. O. S. -. Fesb, University of Zagreb-FER, University of Osijek, Split, Croatia., S. S. I. O. Physics, Hbni, Kolkata, India., M. F. Physik, Munchen, Now at Centro Brasileiro de Pesquisas F'isicas, R. Janeiro, Brasil., Unidad de Part'iculas y Cosmolog'ia, U. Complutense, E. Madrid, Spain., Madrid, Instituto de Astrof'isica de Canarias, L. Laguna, Division of Astrophysics, U. Lodz, Lodz, Poland, D. Zeuthen, Zeuthen, Institut de F'isica d'Altes Energies, T. Z. F. O. Science, Technology, E-08193 Bellaterra, Bellaterra, Dipartimento Sfta, S. D. Fisica, U. Siena, I. Pisa, Siena, Institut fur Theoretische Physik und Astrophysik - Fakultat Wurzburg, Wurzburg, Finnish Magic Consortium Tuorla Observatory, Finnish Magic Consortium Finnish Centre of Astronomy with Eso, U. Turku, 20 Vaisalantie, FI-21500 Piikkio, A. Division, U. Oulu, F. Oulu, Finland., Piikkio, U. Barcelona, Barcelona, U. Barcelona, Japanese Magic Consortium, Kyoto, Japan., Inst. for Nucl. Research, Nucl. Energy, Sofía, Bulgaria., U. Pisa, I. Pisa, Pisa, H. Berlin, I. Germany, A. N. D. D. Fisica, U. Trieste, I. Trieste, A. Spain, also at INAF-Trieste, D. Physics, Astronomy, U. Bologna

/ Abstract

The dwarf spheroidal galaxy Ursa Major II (UMaII) is believed to be one of the most dark-matter dominated systems among the Milky Way satellites and represents a suitable target for indirect dark matter (DM) searches. The MAGIC telescopes carried out a deep observation campaign on UMaII between 2014 and 2016, collecting almost one hundred hours of good-quality data. This campaign enlarges the pool of DM targets observed at very high energy (E ≳ 50 GeV) in search for signatures of DM annihilation in the wide mass range between ∼100 GeV and ∼100 TeV. To this end, the data are analyzed with the full likelihood analysis, a method based on the exploitation of the spectral information of the recorded events for an optimal sensitivity to the explored DM models. We obtain constraints on the annihilation cross-section for different channels that are among the most robust and stringent achieved so far at the TeV mass scale from observations of dwarf satellite galaxies.

Journal: Journal of Cosmology and Astroparticle Physics

DOI: 10.1088/1475-7516/2018/03/009