Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..558..749h&link_type=abstract
HIGH ENERGY GAMMA-RAY ASTRONOMY: International Symposium. AIP Conference Proceedings, Volume 558, pp. 749-752 (2001).
Astronomy and Astrophysics
Astronomy
Supernova Remnants, Gamma-Ray Sources (Astronomical), Gamma-Ray Detection, Gamma-Ray Production, Astrophysical Radiation Mechanisms, Astronomical Spectra, X-Ray Spectra, Gamma-Ray Spectra
Scientific paper
The HEGRA Stereoscopic Cherenkov Telescope System was used to extensively observe the Supernova Remnant Cassiopeia A. Observations were performed between 1997 and 1999, in total 232 hrs of data were accumulated. TeV γ-ray emission is detected at the 5 σ level. In this preliminary analysis, a flux of (5.8+/-1.2stat+/-2syst)×10-9 ph m-2 s-1 above 1 TeV is derived. The detection of TeV γ-rays indicates that Cas A is a site of CR acceleration for particles-either nucleons or electrons-with multi-TeV energies. However, the assignment of the γ-ray emission to either or both particle populations relies on modeling. We put our detection in the context of simulation predictions. .
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