Search for >= 300 GeV Gamma Rays From the SNR CAS A with the cat Telescope

Astronomy and Astrophysics – Astrophysics

Scientific paper

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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. It is therefore tempting to consider two possible channels for TeV gamma-ray emission from this object: i) bremsstrahlung and inverse Compton radiation from electrons and/or ii) pi ^0 production from an associated high energy cosmic ray component hitting surrounding material. Cas A was observed by the CAT imaging Cherenkov telescope at gamma-ray energies above 300 GeV during two observing seasons in 1997 and 1998. The results of two independant data analyses are reported and tentatively compared with existing models.

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