Observation of VHE γ-rays from Cassiopeia A with the MAGIC telescope

doi:10.1051/0004-6361:20078168

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Title:		Observation of VHE γ-rays from Cassiopeia A with the MAGIC telescope
Authors:		Albert, J.; Aliu, E.; Anderhub, H.; Antoranz, P.; Armada, A.; Baixeras, C.; Barrio, J. A.; Bartko, H.; Bastieri, D.; Becker, J. K.; Bednarek, W.; Berger, K.; Bigongiari, C.; Biland, A.; Bock, R. K.; Bordas, P.; Bosch-Ramon, V.; Bretz, T.; Britvitch, I.; Camara, M.; Carmona, E.; Chilingarian, A.; Coarasa, J. A.; Commichau, S.; Contreras, J. L.; Cortina, J.; Costado, M. T.; Curtef, V.; Danielyan, V.; Dazzi, F.; de Angelis, A.; Delgado, C.; de Los Reyes, R.; de Lotto, B.; Domingo-Santamaría, E.; Dorner, D.; Doro, M.; Errando, M.; Fagiolini, M.; Ferenc, D.; Fernández, E.; Firpo, R.; Flix, J.; Fonseca, M. V.; Font, L.; Fuchs, M.; Galante, N.; García-López, R.; Garczarczyk, M.; Gaug, M.; Giller, M.; Goebel, F.; Hakobyan, D.; Hayashida, M.; Hengstebeck, T.; Herrero, A.; Höhne, D.; Hose, J.; Hsu, C. C.; Jacon, P.; Jogler, T.; Kosyra, R.; Kranich, D.; Kritzer, R.; Laille, A.; Lindfors, E.; Lombardi, S.; Longo, F.; López, J.; López, M.; Lorenz, E.; Majumdar, P.; Maneva, G.; Mannheim, K.; Mansutti, O.; Mariotti, M.; Martínez, M.; Mazin, D.; Merck, C.; Meucci, M.; Meyer, M.; Miranda, J. M.; Mirzoyan, R.; Mizobuchi, S.; Moralejo, A.; Nilsson, K.; Ninkovic, J.; Oña-Wilhelmi, E.; Otte, N.; Oya, I.; Paneque, D.; Panniello, M.; Paoletti, R.; Paredes, J. M.; Pasanen, M.; Pascoli, D.; Pauss, F.; Pegna, R.; Persic, M.; Peruzzo, L.; Piccioli, A.; Poller, M.; Puchades, N.; Prandini, E.; Raymers, A.; Rhode, W.; Ribó, M.; Rico, J.; Rissi, M.; Robert, A.; Rügamer, S.; Saggion, A.; Sánchez, A.; Sartori, P.; Scalzotto, V.; Scapin, V.; Schmitt, R.; Schweizer, T.; Shayduk, M.; Shinozaki, K.; Shore, S. N.; Sidro, N.; Sillanpää, A.; Sobczynska, D.; Stamerra, A.; Stark, L. S.; Takalo, L.; Temnikov, P.; Tescaro, D.; Teshima, M.; Tonello, N.; Torres, D. F.; Turini, N.; Vankov, H.; Vitale, V.; Wagner, R. M.; Wibig, T.; Wittek, W.; Zandanel, F.; Zanin, R.; Zapatero, J.
Affiliation:		AA(Universität Würzburg, 97074 Würzburg, Germany), AB(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain ), AC(ETH Zurich, 8093, Switzerland), AD(Universidad Complutense, 28040 Madrid, Spain), AE(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), AF(Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain), AG(Universidad Complutense, 28040 Madrid, Spain), AH(Max-Planck-Institut für Physik, 80805 München, Germany), AI(Università di Padova and INFN, 35131 Padova, Italy), AJ(Universität Dortmund, 44227 Dortmund, Germany), AK(University of Łódź, 90236 Lodz, Poland), AL(Universität Würzburg, 97074 Würzburg, Germany), AM(Università di Padova and INFN, 35131 Padova, Italy), AN(ETH Zurich, 8093, Switzerland), AO(Max-Planck-Institut für Physik, 80805 München, Germany ; Università di Padova and INFN, 35131 Padova, Italy), AP(Universitat de Barcelona, 08028 Barcelona, Spain), AQ(Universitat de Barcelona, 08028 Barcelona, Spain), AR(Universität Würzburg, 97074 Würzburg, Germany), AS(ETH Zurich, 8093, Switzerland), AT(Universidad Complutense, 28040 Madrid, Spain), AU(Max-Planck-Institut für Physik, 80805 München, Germany), AV(Yerevan Physics Institute, 375036 Yerevan, Armenia), AW(Max-Planck-Institut für Physik, 80805 München, Germany), AX(ETH Zurich, 8093, Switzerland), AY(Universidad Complutense, 28040 Madrid, Spain), AZ(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), BA(Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain), BB(Universität Dortmund, 44227 Dortmund, Germany), BC(Yerevan Physics Institute, 375036 Yerevan, Armenia), BD(Università di Padova and INFN, 35131 Padova, Italy), BE(Università di Udine, and INFN Trieste, 33100 Udine, Italy), BF(Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain), BG(Universidad Complutense, 28040 Madrid, Spain), BH(Università di Udine, and INFN Trieste, 33100 Udine, Italy), BI(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), BJ(Universität Würzburg, 97074 Würzburg, Germany), BK(Università di Padova and INFN, 35131 Padova, Italy), BL(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), BM(Università di Siena, and INFN Pisa, 53100 Siena, Italy), BN(University of California, Davis, 95616-8677, USA), BO(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), BP(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), BQ(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), BR(Universidad Complutense, 28040 Madrid, Spain), BS(Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain), BT(Max-Planck-Institut für Physik, 80805 München, Germany), BU(Max-Planck-Institut für Physik, 80805 München, Germany), BV(Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain), BW(Max-Planck-Institut für Physik, 80805 München, Germany), BX(Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain), BY(University of Łódź, 90236 Lodz, Poland), BZ(Max-Planck-Institut für Physik, 80805 München, Germany), CA(Yerevan Physics Institute, 375036 Yerevan, Armenia), CB(Max-Planck-Institut für Physik, 80805 München, Germany), CC(Humboldt-Universität zu Berlin, 12489 Berlin, Germany), CD(Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain), CE(Universität Würzburg, 97074 Würzburg, Germany), CF(Max-Planck-Institut für Physik, 80805 München, Germany), CG(Max-Planck-Institut für Physik, 80805 München, Germany), CH(University of Łódź, 90236 Lodz, Poland), CI(Max-Planck-Institut für Physik, 80805 München, Germany), CJ(Max-Planck-Institut für Physik, 80805 München, Germany), CK(ETH Zurich, 8093, Switzerland), CL(Universität Würzburg, 97074 Würzburg, Germany), CM(University of California, Davis, 95616-8677, USA), CN(Tuorla Observatory, Turku University, 21500 Piikkiö, Finland), CO(Università di Padova and INFN, 35131 Padova, Italy), CP(Università di Udine, and INFN Trieste, 33100 Udine, Italy), CQ(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), CR(Universidad Complutense, 28040 Madrid, Spain), CS(ETH Zurich, 8093, Switzerland ; Max-Planck-Institut für Physik, 80805 München, Germany), CT(Max-Planck-Institut für Physik, 80805 München, Germany), CU(Institute for Nuclear Research and Nuclear Energy, 1784 Sofia, Bulgaria), CV(Universität Würzburg, 97074 Würzburg, Germany), CW(Università di Udine, and INFN Trieste, 33100 Udine, Italy), CX(Università di Padova and INFN, 35131 Padova, Italy), CY(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), CZ(Max-Planck-Institut für Physik, 80805 München, Germany), DA(Max-Planck-Institut für Physik, 80805 München, Germany), DB(Università di Siena, and INFN Pisa, 53100 Siena, Italy), DC(Universität Würzburg, 97074 Würzburg, Germany), DD(Universidad Complutense, 28040 Madrid, Spain), DE(Max-Planck-Institut für Physik, 80805 München, Germany), DF(Max-Planck-Institut für Physik, 80805 München, Germany), DG(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), DH(Tuorla Observatory, Turku University, 21500 Piikkiö, Finland), DI(Max-Planck-Institut für Physik, 80805 München, Germany), DJ(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), DK(Max-Planck-Institut für Physik, 80805 München, Germany), DL(Universidad Complutense, 28040 Madrid, Spain), DM(Max-Planck-Institut für Physik, 80805 München, Germany), DN(Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain), DO(Università di Siena, and INFN Pisa, 53100 Siena, Italy), DP(Universitat de Barcelona, 08028 Barcelona, Spain), DQ(Tuorla Observatory, Turku University, 21500 Piikkiö, Finland), DR(Università di Padova and INFN, 35131 Padova, Italy), DS(ETH Zurich, 8093, Switzerland), DT(Università di Siena, and INFN Pisa, 53100 Siena, Italy), DU(Università di Udine, and INFN Trieste, 33100 Udine, Italy ; INAF - Osservatorio Astronomico and INFN Trieste, 34131 Trieste, Italy), DV(Università di Padova and INFN, 35131 Padova, Italy), DW(Università di Siena, and INFN Pisa, 53100 Siena, Italy), DX(Universität Würzburg, 97074 Würzburg, Germany), DY(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), DZ(Università di Padova and INFN, 35131 Padova, Italy), EA(Yerevan Physics Institute, 375036 Yerevan, Armenia), EB(Universität Dortmund, 44227 Dortmund, Germany), EC(Universitat de Barcelona, 08028 Barcelona, Spain), ED(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), EE(ETH Zurich, 8093, Switzerland), EF(Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain), EG(Universität Würzburg, 97074 Würzburg, Germany), EH(Università di Padova and INFN, 35131 Padova, Italy), EI(Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain), EJ(Università di Padova and INFN, 35131 Padova, Italy), EK(Università di Padova and INFN, 35131 Padova, Italy), EL(Università di Udine, and INFN Trieste, 33100 Udine, Italy), EM(Universität Würzburg, 97074 Würzburg, Germany), EN(Max-Planck-Institut für Physik, 80805 München, Germany), EO(Humboldt-Universität zu Berlin, 12489 Berlin, Germany ; Max-Planck-Institut für Physik, 80805 München, Germany), EP(Max-Planck-Institut für Physik, 80805 München, Germany), EQ(Università di Pisa, and INFN Pisa, 56126 Pisa, Italy), ER(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), ES(Tuorla Observatory, Turku University, 21500 Piikkiö, Finland), ET(University of Łódź, 90236 Lodz, Poland), EU(Università di Siena, and INFN Pisa, 53100 Siena, Italy), EV(ETH Zurich, 8093, Switzerland), EW(Tuorla Observatory, Turku University, 21500 Piikkiö, Finland), EX(Institute for Nuclear Research and Nuclear Energy, 1784 Sofia, Bulgaria), EY(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), EZ(Max-Planck-Institut für Physik, 80805 München, Germany), FA(Max-Planck-Institut für Physik, 80805 München, Germany), FB(ICREA and Institut de Cienciès de l'Espai (IEEC-CSIC), 08193 Bellaterra, Spain), FC(Università di Siena, and INFN Pisa, 53100 Siena, Italy), FD(Institute for Nuclear Research and Nuclear Energy, 1784 Sofia, Bulgaria), FE(Università di Udine, and INFN Trieste, 33100 Udine, Italy), FF(Max-Planck-Institut für Physik, 80805 München, Germany), FG(University of Łódź, 90236 Lodz, Poland), FH(Max-Planck-Institut für Physik, 80805 München, Germany), FI(Università di Padova and INFN, 35131 Padova, Italy), FJ(Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain), FK(Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain)
Publication:		Astronomy and Astrophysics, Volume 474, Issue 3, November II 2007, pp.937-940 (A&A Homepage)
Publication Date:		11/2007
Origin:		EDP Sciences
Keywords:		acceleration of particles, ISM: cosmic rays, gamma rays:, observations, ISM: individual objects:, Cassiopeia A, ISM: supernova remnants
DOI:		10.1051/0004-6361:20078168
Bibliographic Code:		2007A&A...474..937A

Abstract

Aims:We searched for very high energy (VHE) γ-ray emission from the supernova remnant Cassiopeia A
Methods: The shell-type supernova remnant Cassiopeia A was observed with the 17 m MAGIC telescope between July 2006 and January 2007 for a total time of 47 h.
Results: The source was detected above an energy of 250 GeV with a significance of 5.2σ and a photon flux above 1 TeV of (7.3 ± 0.7_stat ± 2.2_sys) × 10^-13 cm^-2s^-1. The photon spectrum is compatible with a power law dN/dE ∝ E^-Γ with a photon index Γ = 2.3 ± 0.2_stat ± 0.2_sys. The source is point-like within the angular resolution of the telescope.

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