A synoptic spectral study of Cassiopeia-A based on XMM-Newton and BeppoSax observations

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dc.creatorBleeker, Johan
dc.creatorVink, Jacco
dc.creatorvan der Heyden, Kurt
dc.creatorWillingale, Dick
dc.creatorKaastra, Jelle
dc.creatorLaming, Martin
dc.date2002-02-11
dc.date.accessioned2026-07-25T18:34:58Z
dc.descriptionIn this paper we present recent image and spectral data of Cas-A obtained with XMM-Newton and BeppoSAX. Analysis of the hard X-ray continuum does not support an interpretation of the hard X-radiation as synchrotron emission produced in the primary shock, non-thermal Bremsstrahlung is a plausible alternative. Moreover, a recent 500 kilosecond deep observation of the hard X-ray continuum by BeppoSAX has revealed the positive detection of the 44Sc nuclear decay lines at 67.9 and 78.4 keV. Appropriate modelling of the hard X-ray continuum leads to an estimate of the initial 44Ti mass of (0.8-2.5)E-4 solar masses. We also present ionisation age, temperature, abundances maps. The observed elemental abundance ratio patterns can be reconciled best with a type Ib SNe, arising from a 60 solar mass progenitor (ZAMS) with high-mass-loss. The accurate modeling of the image-resolved emission line spectra has enabled us to derive reliable Doppler velocities for the bright Si-K, S-K, and Fe-K line complexes.
dc.description8 pages, 12 figures, to appear in the "New Visions of the Universe in the XMM-Newton and Chandra era" symposium
dc.identifierhttps://arxiv.org/abs/astro-ph/0202207
dc.identifierhttp://arxiv.org/abs/astro-ph/0202207
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/56573
dc.subjectAstrophysics
dc.titleA synoptic spectral study of Cassiopeia-A based on XMM-Newton and BeppoSax observations
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