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 |
Observation of VHE γ-rays from Cassiopeia A with the MAGIC telescope
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
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 ± ±
10-13 cm-2s-1. The photon spectrum is compatible with a power law dN/dE
with a photon index
Γ = 2.3 ±
±
. 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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