The signature of 44Ti in Cassiopeia A revealed by IBIS/ISGRI on INTEGRAL

Abstract

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.

5 pages, 4 figures, Accepted for publication in ApJL

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• Numerical simulations of diffusive shock acceleration in SNRs
• Revisiting INTEGRAL/SPI observations of 44Ti from Cassiopeia A
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• The resonance triplet at E_alpha = 4.5 MeV in the 40Ca(alpha,gamma)44Ti reaction
• Hard X-ray emission and ${}^{44}$Ti line features of Tycho Supernova Remnant
• Primary gamma-ray spectra in 44Ti of astrophysical interest
• Search for Sc-K line emission from RX J0852.0--4622 Supernova remnant with Suzaku
• Constraints on the kinematics of the 44Ti ejecta of Cassiopeia A from INTEGRAL/SPI
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