An Anisotropic Illumination Model of Seyfert I Galaxies

Abstract

We develop a self-consistent model of Seyfert galaxies continuum emission. High energy emission is produced by Inverse Compton process on soft photons emitted as thermal radiation by the accretion disk. Thermal emission is, at turn, entirely due to reprocessing of the impinging high energy photons. The high energy source is assumed to be an optically thin plasma of highly relativistic leptons ($e^+-e^-$), at rest at a given height on the disk axis. This warm source could be the result of a strong schock between an abortive jet coming from the disk and the interstellar medium. Such a geometry is highly anisotropic, which has a strong influence on Compton process. Monte-Carlo simulations allow the superposition of a reflected component (the so-called high energy bump) to the UV to X-ray spectrum obtained with our model, leading us to a first comparison with observations by fitting the high energy spectra of NGC4151 and IC4329a.