Vertical structure of accretion disks

Astronomy and Astrophysics – Astronomy

Scientific paper

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Accretion Disks, Active Galactic Nuclei, X Ray Spectra, Black Holes (Astronomy), Disk Galaxies, Extraterrestrial Radiation, Radiation Pressure, Radiative Heat Transfer

Scientific paper

Observationally, some active galactic nuclei show soft x-ray excess which suggests that spectrum deviates from black body. Attempts in calculating the emission spectrum for optically thick disk were made. Most investigations to date were made by adopting the given vertical structure which is obtained by assuming that radiation pressure dominates over gas pressure. However, this seems to be inadequate, because the effect of gas pressure is expected to be significant in determining the vertical structure near the surface where emission spectrum is formed. A detailed calculation, where radiative transfer and vertical structure are self-consistently solved, is performed.

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