Broad-band X-ray observations of two typical compact sources by BeppoSAX

Citation
L. Burderi et al., Broad-band X-ray observations of two typical compact sources by BeppoSAX, ASTROPHYS L, 38(1-6), 1999, pp. 81
Citations number
4
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL LETTERS & COMMUNICATIONS
ISSN journal
08886512 → ACNP
Volume
38
Issue
1-6
Year of publication
1999
Database
ISI
SICI code
0888-6512(1999)38:1-6<81:BXOOTT>2.0.ZU;2-Y
Abstract
We report broad band spectral analysis performed on Cyg X-l and Cen X-3 obs erved by BeppoSAX. The 0.1-30 keV spectrum of Cyg X-l shows evidences of re lativistic smearing of the continuum reflected by the cold matter in the di sc. The inferred inner radius of the disc is 10 +/- 5 Schwarsschild radii, much smaller than the prediction of the ADAF model. In the hard spectrum of Cen X-3 an absorption cyclotron line is evident at similar to 30 keV. The pulse phase resolved spectral analysis reveals a decrease of the cyclotron energy from the ascent to the descent of the folded light curve. This is su ggesting of a complex structure of the magnetic field lines in this source.