Search for >= 400 GeV gamma-rays from the SNR Cas A

Details Search for >= 400 GeV gamma-rays from the SNR Cas A Search for >= 400 GeV gamma-rays from the SNR Cas A

1999-06-02

arxiv.org/abs/astro-ph/9906040v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures to appear in the proceedings of the 26th International Cosmic Ray Conference

Scientific paper

The recent detection of a hard X-ray component in the supernova remnant Cassiopeia A is interpreted as synchrotron emission from electrons accelerated to energies up to 40 TeV (Allen et al., 1997). It is therefore tempting to consider TeV gamma-ray emission from this object through : i) bremsstrahlung and inverse Compton radiation from electrons and/or ii) pi0 production from an associated high energy cosmic ray component hitting surrounding material. Cas A was observed by the CAT imaging Cherenkov telescope during the observing season Aug-Nov 1998. An upper limit to the integral flux above 400 GeV of 0.74x10^-11 gamma.cm^-2.s^-1 is derived. This result is used to constrain shock-acceleration models for production of VHE gamma-rays in SNRs.

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