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

J. Albert; E. Aliu; H. Anderhub; P. Antoranz; A. Armada; C. Baixeras; J. A. Barrio; H. Bartko; D. Bastieri; J. K. Becker; W. Bednarek; K. Berger; C. Bigongiari; A. Biland; R. K. Bock; P. Bordas; V. Bosch-Ramon; T. Bretz; I. Britvitch; M. Camara; E. Carmona; A. Chilingarian; J. A. Coarasa; S. Commichau; J. L. Contreras; J. Cortina; M. T. Costado; V. Curtef; V. Danielyan; F. Dazzi; A. De  Angelis; C. Delgado; R. de los Reyes; B. De Lotto; E. Domingo-Santamaría; D. Dorner; M. Doro; M. Errando; M. Fagiolini; D. Ferenc; E. Fernández; R. Firpo; J. Flix; M. V. Fonseca; L. Font; M. Fuchs; N. Galante; R. García-López; M. Garczarczyk; M. Gaug; M. Giller; F. Goebel; D. Hakobyan; M. Hayashida; T. Hengstebeck; A. Herrero; D. Höhne; J. Hose; C. C. Hsu; P. Jacon; T. Jogler; R. Kosyra; D. Kranich; R. Kritzer; A. Laille; E. Lindfors; S. Lombardi; F. Longo; J. López; M. López; E. Lorenz; P. Majumdar; G. Maneva; K. Mannheim; O. Mansutti; M. Mariotti; M. Martínez; D. Mazin; C. Merck; M. Meucci; M. Meyer; J. M. Miranda; R. Mirzoyan; S. Mizobuchi; A. Moralejo; K. Nilsson; J. Ninkovic; E. Oña-Wilhelmi; N. Otte; I. Oya; D. Paneque; M. Panniello; R. Paoletti; J. M. Paredes; M. Pasanen; D. Pascoli; F. Pauss; R. Pegna; M. Persic; L. Peruzzo; A. Piccioli; M. Poller; N. Puchades; E. Prandini; A. Raymers; W. Rhode; M. Ribó; J. Rico; M. Rissi; A. Robert; S. Rügamer; A. Saggion; A. Sánchez; P. Sartori; V. Scalzotto; V. Scapin; R. Schmitt; T. Schweizer; M. Shayduk; K. Shinozaki; S. N. Shore; N. Sidro; A. Sillanpää; D. Sobczynska; A. Stamerra; L. S. Stark; L. Takalo; P. Temnikov; D. Tescaro; M. Teshima; N. Tonello; D. F. Torres; N. Turini; H. Vankov; V. Vitale; R. M. Wagner; T. Wibig; W. Wittek; F. Zandanel; R. Zanin; J. Zapatero

doi:10.1051/0004-6361:20078168

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Volume 474 / No 3 (November II 2007)

A&A, 474 3 (2007) 937-940

Abstract

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Issue		A&A Volume 474, Number 3, November II 2007


Page(s)		937 - 940
Section		Interstellar and circumstellar matter
DOI		https://doi.org/10.1051/0004-6361:20078168
Published online		23 October 2007

A&A 474, 937-940 (2007)

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

J. Albert¹, E. Aliu², H. Anderhub³, P. Antoranz⁴, A. Armada², C. Baixeras⁵, J. A. Barrio⁴, H. Bartko⁶, D. Bastieri⁷, J. K. Becker⁸, W. Bednarek⁹, K. Berger¹, C. Bigongiari⁷, A. Biland³, R. K. Bock⁶^,7, P. Bordas¹⁰, V. Bosch-Ramon¹⁰, T. Bretz¹, I. Britvitch³, M. Camara⁴, E. Carmona⁶, A. Chilingarian¹¹, J. A. Coarasa⁶, S. Commichau³, J. L. Contreras⁴, J. Cortina², M. T. Costado¹², V. Curtef⁸, V. Danielyan¹¹, F. Dazzi⁷, A. De Angelis¹³, C. Delgado¹², R. de los Reyes⁴, B. De Lotto¹³, E. Domingo-Santamaría², D. Dorner¹, M. Doro⁷, M. Errando², M. Fagiolini¹⁴, D. Ferenc¹⁵, E. Fernández², R. Firpo², J. Flix², M. V. Fonseca⁴, L. Font⁵, M. Fuchs⁶, N. Galante⁶, R. García-López¹², M. Garczarczyk⁶, M. Gaug¹², M. Giller⁹, F. Goebel⁶, D. Hakobyan¹¹, M. Hayashida⁶, T. Hengstebeck¹⁶, A. Herrero¹², D. Höhne¹, J. Hose⁶, C. C. Hsu⁶, P. Jacon⁹, T. Jogler⁶, R. Kosyra⁶, D. Kranich³, R. Kritzer¹, A. Laille¹⁵, E. Lindfors¹⁷, S. Lombardi⁷, F. Longo¹³, J. López², M. López⁴, E. Lorenz³^,6, P. Majumdar⁶, G. Maneva¹⁸, K. Mannheim¹, O. Mansutti¹³, M. Mariotti⁷, M. Martínez², D. Mazin⁶, C. Merck⁶, M. Meucci¹⁴, M. Meyer¹, J. M. Miranda⁴, R. Mirzoyan⁶, S. Mizobuchi⁶, A. Moralejo², K. Nilsson¹⁷, J. Ninkovic⁶, E. Oña-Wilhelmi², N. Otte⁶, I. Oya⁴, D. Paneque⁶, M. Panniello¹², R. Paoletti¹⁴, J. M. Paredes¹⁰, M. Pasanen¹⁷, D. Pascoli⁷, F. Pauss³, R. Pegna¹⁴, M. Persic¹³^,19, L. Peruzzo⁷, A. Piccioli¹⁴, M. Poller¹, N. Puchades², E. Prandini⁷, A. Raymers¹¹, W. Rhode⁸, M. Ribó¹⁰, J. Rico², M. Rissi³, A. Robert⁵, S. Rügamer¹, A. Saggion⁷, A. Sánchez⁵, P. Sartori⁷, V. Scalzotto⁷, V. Scapin¹³, R. Schmitt¹, T. Schweizer⁶, M. Shayduk¹⁶^,6, K. Shinozaki⁶, S. N. Shore²⁰, N. Sidro², A. Sillanpää¹⁷, D. Sobczynska⁹, A. Stamerra¹⁴, L. S. Stark³, L. Takalo¹⁷, P. Temnikov¹⁸, D. Tescaro², M. Teshima⁶, N. Tonello⁶, D. F. Torres²¹, N. Turini¹⁴, H. Vankov¹⁸, V. Vitale¹³, R. M. Wagner⁶, T. Wibig⁹, W. Wittek⁶, F. Zandanel⁷, R. Zanin² and J. Zapatero⁵

¹ Universität Würzburg, 97074 Würzburg, Germany
² Institut de Física d'Altes Energies, Edifici Cn., 08193 Bellaterra (Barcelona), Spain e-mail: emma@apc.univ-paris7.fr
³ ETH Zurich, 8093, Switzerland
⁴ Universidad Complutense, 28040 Madrid, Spain
⁵ Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
⁶ Max-Planck-Institut für Physik, 80805 München, Germany
⁷ Università di Padova and INFN, 35131 Padova, Italy
⁸ Universität Dortmund, 44227 Dortmund, Germany
⁹ University of Łódź, 90236 Lodz, Poland
¹⁰ Universitat de Barcelona, 08028 Barcelona, Spain
¹¹ Yerevan Physics Institute, 375036 Yerevan, Armenia
¹² Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain
¹³ Università di Udine, and INFN Trieste, 33100 Udine, Italy
¹⁴ Università di Siena, and INFN Pisa, 53100 Siena, Italy
¹⁵ University of California, Davis, 95616-8677, USA
¹⁶ Humboldt-Universität zu Berlin, 12489 Berlin, Germany
¹⁷ Tuorla Observatory, Turku University, 21500 Piikkiö, Finland
¹⁸ Institute for Nuclear Research and Nuclear Energy, 1784 Sofia, Bulgaria
¹⁹ INAF - Osservatorio Astronomico and INFN Trieste, 34131 Trieste, Italy
²⁰ Università di Pisa, and INFN Pisa, 56126 Pisa, Italy
²¹ ICREA and Institut de Cienciès de l'Espai (IEEC-CSIC), 08193 Bellaterra, Spain

Received: 27 June 2007
Accepted: 28 August 2007

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 ± $0.7_{\rm stat}$ ± $2.2_{\rm sys})$ $\times$ 10^-13 cm^-2s^-1. The photon spectrum is compatible with a power law dN/dE $\propto$ $E^{-\Gamma}$ with a photon index Γ = 2.3 ± $0.2_{\rm stat}$ ± $0.2_{\rm sys}$ . The source is point-like within the angular resolution of the telescope.

Key words: acceleration of particles / ISM: cosmic rays / gamma rays: observations / ISM: individual objects: Cassiopeia A / ISM: supernova remnants

© ESO, 2007

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