The hard X-ray and Ti-44 emission of Cas A

Details The hard X-ray and Ti-44 emission of Cas A The hard X-ray and Ti-44 emission of Cas A

1999-06-29

arxiv.org/abs/astro-ph/9906476v1

Astronomy and Astrophysics

Astrophysics

; JVs present address: AIP, Potsdam (jvink@aip.de). To be published in Advances of Space Research (proc. of the Cospar Confere

Scientific paper

10.1016/S0273-1177(99)00823-6

We present an analysis of the BeppoSAX high X-ray energy spectrum of the supernova remnant Cassiopeia A with an observation time of 83 ks. We measure a flux upper limit of 4.1E-5 ph/cm^2/s (99.7% confidence) of the nuclear decay lines of Ti-44 at 68 keV and 78 keV that is lower and inconsistent with the flux of an accompanying line at 1157 keV measured by CGRO's Comptel. However, if the underlying X-ray continuum is lower, because the spectrum is steepening, the actual Ti-44 flux may be higher and consistent with the Comptel result, although the measured flux of (2.9 +/- 1.0)E-5 ph/cm^2/s under this assumption is still lower than the flux measured by Comptel.

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