Sandwich-accretion disk models for active galactic nuclei.

Mathematics

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Scientific paper

The author uses "sandwich-accretion disk" models to describe the inner part of active galactic nuclei. He examines by means of analytical and numerical methods the vertical structure of sandwich accretion disks from the central plane to the coronal phase including a transition region. Standard theory is applied to the cool disk and the coronal phase. A parameter Fq is included which represents the fraction of energy dissipated in the corona in relation to the total amount of dissipated energy. The author assumes that accretion takes place both in the disk and in the corona. He strongly suggests that majority of accretion occurs in the cool disk: Fq ≪ 1. The extension of the coronal phase is determined by the accretion rate for a given central mass. The coronae are described as one-temperature (1-T) and two-temperature (2-T) plasma both for hydrostatic equilibria and expanding coronae. The author takes local dissipation of kinetic energy as heating mechanism. Cooling is due to blackbody radiation for the disk and bremsstrahlung and inverse Compton scattering of soft photons for the corona. One obtains higher intensities in the high-frequency range for analytical models compared to numerical calculations.

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