The RXTE Hard X-Ray Spectrum of Cassiopeia A

Details The RXTE Hard X-Ray Spectrum of Cassiopeia A The RXTE Hard X-Ray Spectrum of Cassiopeia A

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.5506a&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #55.06; Bulletin of the American Astronomical Society, Vol. 28, p.1346

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The Cassiopeia A supernova remnant (SNR) is the youngest SNR observed in our Galaxy and is the brightest Galactic shell-type SNR at radio and X-ray energies. The hard X-ray spectrum obtained from the PCA and HEXTE instruments on the Rossi X-ray Timing Explorer satellite confirms the existence of a hard X-ray component that extends to tens of keV. Preliminary results suggest that the hard X-ray emission may be nonthermal. If, for example, the hard X rays are produced by synchrotron emission from electrons with energies in excess of 10(13) eV, this RXTE observation of Cassiopeia A provides evidence to support the hypothesis that Galactic cosmic rays are accelerated in the shocks of SNRs. A description of the analysis of the Cassiopeia A spectrum for evidence of (44) Ti line emission and about searches for evidence of nonthermal emission from other SNRs are described in a separate abstracts for this Meeting.

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