Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-29
Astrophys.J.647:L41-L44,2006
Astronomy and Astrophysics
Astrophysics
5 pages, 4 figures, Accepted for publication in ApJL
Scientific paper
10.1086/507300
We report the detection of both the 67.9 and 78.4 keV 44Sc gamma-ray lines in Cassiopeia A with the INTEGRAL IBIS/ISGRI instrument. Besides the robustness provided by spectro-imaging observations, the main improvements compared to previous measurements are a clear separation of the two 44Sc lines together with an improved significance of the detection of the hard X-ray continuum up to 100 keV. These allow us to refine the determination of the 44Ti yield and to constrain the nature of the nonthermal continuum emission. By combining COMPTEL, BeppoSAX/PDS and ISGRI measurements, we find a line flux of (2.5 +/- 0.3)*10(-5) cm(-2) s(-1) leading to a synthesized 44Ti mass of 1.6 (+0.6-0.3)*10(-4) solar mass. This high value suggests that Cas A is peculiar in comparison to other young supernova remnants, from which so far no line emission from 44Ti decay has been unambiguously detected.
Bloemen Hans
Bykov Andrei M.
Couvreur C.
Decourchelle Anne
den Hartog Peter R.
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