Search for TeV Gamma Rays from Supernova Remnants Cas A and Tycho with the HEGRA Stereoscopic System of Atmospheric Cherenkov Telescopes

Details Search for TeV Gamma Rays from Supernova Remnants Cas A and Tycho with the HEGRA Stereoscopic System of Atmospheric Cherenkov Telescopes Search for TeV Gamma Rays from Supernova Remnants Cas A and Tycho with the HEGRA Stereoscopic System of Atmospheric Cherenkov Telescopes

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.3220a&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #32.20; Bulletin of the American Astronomical Society, Vol. 32, p.1239

Astronomy and Astrophysics

Astronomy

Scientific paper

The HEGRA collaboration operates a system of 5 Imaging Atmospheric Cherenkov Telescopes for gamma-ray astronomy in the energy range above 500 GeV. Based on the method of stereoscopic air shower observations the system achieves an energy flux sensitivity at 1 TeV of approximately 10-12 ergs/cm2 sec for 100 hour of observation time as well as angular and energy resolutions of 0.1 degree and <20%, respectively. In this contribution we summarize and discuss recent results concerning the observations of Supernova Remnants (SNRs). Very deep observations of the SNR Cassiopeia A (232 h) revealed evidence at the 5 σ confidence level that the source emits TeV gamma-rays, indicating that the source accelerates particles up to energies of at least several TeV. Another important result in this field is the non-detection of TeV gamma-rays from Tycho. The flux upper limit based on 65 h observation time seriously constrains the parameter space of diffusive shock acceleration models of cosmic rays.

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