Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-07-28
Astronomy and Astrophysics
Astrophysics
4 Latex pages, 6 figures, To appear in "Proceedings of X-ray Astronomy '99 - Stellar Endpoints, AGN and the Diffuse Background
Scientific paper
10.1063/1.1434705
A BeppoSAX survey of bright Neutron Star (NS) systems in globular clusters, together with the results obtained on Galactic LMXRB, suggests that a two-component model is a reasonable description of the 0.1-200 keV spectra. At energies lower than a few keV, a thermal component dominates, either due to the direct view of the NS surface, to the emission of the boundary layer, or to a multi-temperature blackbody originating in the accretion disk. At higher energies, a power-law with an high-energy cutoff is the likely signature of thermal Comptonization of soft X-ray photons, probably produced by the same thermal mechanisms as above. The plasma optical depth (electron temperature) correlates (anticorrelates) with the X-ray luminosity, suggesting that the properties of the Comptonizing plasma are driven by the X-ray energy output.
Guainazzi Matteo
Oosterbroek Tim
Parmar Arvind N.
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