Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-02-06
Astronomy and Astrophysics
Astrophysics
To appear in the Proceedings of the 1997 Conference on 'The Active X-ray Sky: Results from BeppoSAX and Rossi-XTE' eds. L. Sca
Scientific paper
10.1016/S0920-5632(98)00227-8
We report on highlight results on celestial sources observed in the high energy band (>20 keV) with BeppoSAX. In particular we review the spectral properties of sources that belong to different classes of objects, i.e. stellar coronae (Algol), supernova remnants (Cas A), low mass X-ray binaries (Cygnus X-2 and the X-ray burster GS1826-238), black hole candidates (Cygnus X-1) and Active Galactic Nuclei (Mkn 3). We detect, for the first time, the broad-band spectrum of a stellar corona up to 100 keV; for Cas A we report upper limits to the ^44Ti line intensities that are lower than those available to date; for Cyg X-2 we report the evidence of a high energy component; we report a clear detection of a broad Fe K line feature from Cygnus X-1 in soft state and during its transition to hard state; Mkn 3 is one of several Seyfert 2 galaxies detected with BeppoSAX at high energies, for which Compton scattering process is important.
Favata Fabio
Fiume Daniele Dal
Frontera Filippo
Malaguti Giuseppe
Nicastro Luciano
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