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Astron. Astrophys. 324, L49-L52


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Letter to the Editor

The broad-band X-ray spectrum of the Cas A supernova remnant as seen by the BeppoSAX observatory

F. Favata1, J. Vink2, D. Dal Fiume3, A.N. Parmar1, A. Santangelo4, T. Mineo4, A. Preite-Martinez5, J.S. Kaastra2, and J.A.M. Bleeker2

1Astrophysics Division - Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
2SRON Laboratory for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
3Istituto Tecnologie e Studio Radiazioni Extraterrestri, CNR, via Gobetti 101, I-40129 Bologna, Italy
4Istituto di Fisica Cosmica ed Applicazioni Informatiche, CNR, Via U. La Malfa 153, I-90146 Palermo, Italy
5Istituto di Astrofisica Spaziale, Via E. Fermi 21, I-00044 Frascati, Italy

Received 13 May 1997 / Accepted 27 May 1997

Abstract

We present a broad band X-ray observation of the Cas A supernova remnant, obtained with the 4 narrow field instruments on board the BeppoSAX satellite. The X-ray spectrum thus obtained spans more than two decades in energy, from FORMULA to FORMULA keV. The complete spectrum is fit with a two-component non-equilibrium ionization (NEI) model plus a power-law component which dominates at the higher energies. The influence of the hard X-ray tail on the parameters derived for the thermal emission is discussed.

Key words: ISM: abundances; ISM: individual objects: Cas A: ISM: supernova remnants: X-rays: ISM

Send offprint requests to: F. Favata (fabio.favata@astro.estec.esa.nl)


© European Southern Observatory (ESO) 1997

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