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Type: Journal article
Title: Evidence for TeV gamma ray emission from Cassiopeia A
Author: Aharonian, F.
Akhperjanian, A.
Barrio, J.
Bernlohr, K.
Borst, H.
Bojahr, H.
Bolz, O.
Contreras, J.
Contina, J.
Denninghoff, S.
Fonseca, V.
Gonzalez, J.
Gotting, N.
Heinzelmann, G.
Hermann, G.
Heusler, A.
Hofmann, W.
Horns, D.
Ibarra, A.
Iserlohe, C.
et al.
Citation: Astronomy and Astrophysics: a European journal, 2001; 370(1):112-120
Publisher: E D P Sciences
Issue Date: 2001
ISSN: 0004-6361
Statement of
F. Aharonian,...G. P. Rowell, al.
Abstract: 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 γ-ray emission was detected at the 5 σ level, and a flux of (5.8 ± 1.2stat ± 1.2syst) 10-9 ph m-2 s-1 above 1 TeV was derived. The spectral distribution is consistent with a power law with a differential spectral index of -2.5 ± 0.4stat ± 0.1syst between 1 and 10TeV. As this is the first report of the detection of a TeV γ-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.
Rights: © The European Southern Observatory 2001
DOI: 10.1051/0004-6361:20010243
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