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Evidence for TeV gamma ray emission from Cassiopeia A

232 hours of data were accumulated from 1997 to 1999, using the HEGRA Stereoscopic Cherenkov Telescope System to observe the supernova remnant Cassiopeia A. TeV <i>γ<i/>-ray emission was detected at the level, and a flux of above 1 TeV was derived. The spectral distribution is consistent...

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Main Authors: Aharonian, Felix A. (Author) , Akhperjanian, A. (Author) , Barrio, J. (Author) , Bernlöhr, Konrad (Author) , Hermann, G. (Author) , Heusler, A. (Author) , Hofmann, Werner (Author) , Kohnle, A. (Author) , Konopelko, Alexander (Author) , Kornmeyer, H. (Author) , Kranich, D. (Author) , Krawczynski, Henric (Author) , Lampeitl, Hubert (Author) , Padilla, L. (Author) , Panter, M. (Author) , Plaga, R. (Author) , Plyasheshnikov, A. V. (Author) , Prahl, J. (Author) , Pühlhofer, Gerd (Author) , Rauterberg, G. (Author) , Röhring, A. (Author) , Tluczykont, M. (Author) , Völk, Heinrich J. (Author) , Wiedner, C. A. (Author) , Wittek, W. (Author)
Format: Article (Journal)
Language:English
Published: 15 April 2001
In: Astronomy and astrophysics
Year: 2001, Volume: 370, Issue: 1, Pages: 112-120
ISSN:1432-0746
DOI:10.1051/0004-6361:20010243
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361:20010243
Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2001/16/aa10501/aa10501.html
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Author Notes:F. Aharonian, A. Akhperjanian, J. Barrio, K. Bernlöhr, H. Börst, H. Bojahr, O. Bolz, J. Contreras, J. Cortina, S. Denninghoff, V. Fonseca, J. Gonzalez, N. Götting, G. Heinzelmann, G. Hermann, A. Heusler, W. Hofmann, D. Horns, A. Ibarra, C. Iserlohe, I. Jung, R. Kankanyan, M. Kestel, J. Kettler, A. Kohnle, A. Konopelko, H. Kornmeyer, D. Kranich, H. Krawczynski, H. Lampeitl, M. Lopez, E. Lorenz, F. Lucarelli, N. Magnussen, O. Mang, H. Meyer, R. Mirzoyan, A. Moralejo, E. Ona, L. Padilla, M. Panter, R. Plaga, A. Plyasheshnikov, J. Prahl, G. Pühlhofer, G. Rauterberg, A. Röhring, W. Rhode, G.P. Rowell, V. Sahakian, M. Samorski, M. Schilling, F. Schröder, M. Siems, W. Stamm, M. Tluczykont, H.J. Völk, C.A. Wiedner, W. Wittek

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520 |a 232 hours of data were accumulated from 1997 to 1999, using the HEGRA Stereoscopic Cherenkov Telescope System to observe the supernova remnant Cassiopeia A. TeV <i>γ<i/>-ray emission was detected at the level, and a flux of above 1 TeV was derived. The spectral distribution is consistent with a power law with a differential spectral index of between 1 and 10 TeV. As this is the first report of the detection of a TeV <i>γ<i/>-ray source on the "centi-Crab"scale, we present the analysis in some detail. Implications for the acceleration of cosmic rays depend on the details of the source modeling. We discuss some important aspects in this paper. 
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