Other
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.459..297i&link_type=abstract
In: Exploring the gamma-ray universe. Proceedings of the Fourth INTEGRAL Workshop, 4-8 September 2000, Alicante, Spain. Editor:
Other
Neutron Stars, X-Ray Spectrum
Scientific paper
We report on the spectral analysis of the peculiar source Cir X-1 observed by the BeppoSAX satellite when the X-ray source was near the periastron. A flare lasting ~6×103s is present at the beginning of the observation. We produced broad band (0.1 - 100 keV) energy spectra during the flare and the persistent emission. At low energies the continuum is well fitted by a model consisting of Comptonization of soft photons, with a temperature of ~0.4 keV, by electrons at a temperature of ~1 keV. Out of the flare a power-law component, with photon index ~3, is dominant at energies higher than 10 keV. This component contributes to ~4% of the total luminosity. During the flare its addition is not statistically significant. Similar hard components have been recently observed in other Z-sources, sometimes related to the position of the source in the color-color diagram. An interesting possibility is that these components are due to the presence of jet emission.
Burderi Luciano
di Salvo Tiziana
Iaria Rosario
La Barbera Nino
Robba Natale Renato
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