Models for the UV-X emission in AGN : influence of different parameters

Abstract

We present the results of computations performed with a new photoionisation-transfer code designed for hot Compton thick media. Presently the code solves the transfer of the continuum with the Accelerated Lambda Iteration method (ALI) and that of the lines in a two stream Eddington approximation, without using the local escape probability formalism to approximate the line transfer. We show the influence that the approximations made in the treatment of the transfer and of the atomic data can have on the broad band UV-X spectrum and on the detailed spectral features (X-ray lines and ionization edges) emitted/absorbed by an X-ray irradiated medium. This transfer code is coupled with a Monte Carlo code which allows to take into account direct and inverse Compton diffusions, and to compute the spectrum emitted up to hundreds of keV energies. The influence of a few physical parameters is shown, and the importance of the density and pressure distribution (constant density, pressure equilibrium) is discussed.