Pawel MagdziarzAstronomical Observatory, Jagiellonian University, Cracow, Poland
Andrzej A. ZdziarskiCopernicus Astronomical Center, Warsaw, Poland
W. Neil Johnson,E. O. Hulburt Center for Space Research, Naval Research Lab, Washington, USA
The UV/X-ray correlation observed by EXOSAT and IUE can be explained by two specific models with reprocessing of X-rays by cold matter. The first one is based on reemision of the X-ray flux absorbed by clouds in the line of sight. The model predicts no Compton reflection which is consistent with the broad-band spectra. The second model, assumes reprocessing of X-rays and gamma-rays by a cold accretion disk with dissipative patchy corona. The homogenous corona model is ruled out here, since the hardness of the X-ray spectrum implies that the plasma is photon starved. The accretion disk model predicts Compton reflection which is only marginally allowed by the observations. Both our models satisfy the energy balance, and provide a good fit to the X/gamma-rays and UV data.