Line and continuum radiation from the outer region of accretion discs in active galactic nuclei. I - Preliminary considerations

Details Line and continuum radiation from the outer region of accretion discs in active galactic nuclei. I - Preliminary considerations Line and continuum radiation from the outer region of accretion discs in active galactic nuclei. I - Preliminary considerations

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...179...60c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 179, no. 1-2, June 1987, p. 60-70.

Astronomy and Astrophysics

Astrophysics

96

Accretion Disks, Active Galactic Nuclei, Continuous Radiation, Emission Spectra, Galactic Radiation, Line Spectra, Nonthermal Radiation

Scientific paper

The structure and emission of the optically thin region of steady accretion discs in Active Galactic Nuclei (AGN) is investigated. It is shown that this region is located far from the center (R/RG very large 102). If its only energy source is provided by accretion, the temperature is very low (1000 - 2000K) and therefore it cannot be identified with the broad line emitting region (BLR). The overall emission of the optically thin region is negligible, except in the infrared at a few microns, where it gives some contribution of the "5 μ-bump". However it is found that, if the disc is heated by the down scattered part of the non-thermal continuum observed in AGN, the physical parameters of the optically thin region satisfy the requirements of photoionization models for the line emission. Hard X-ray heating of the external regions of accretion discs is the source of the "missing energy" in the budget of the BLR (Collin-Souffrin, 1986) and moreover gives rise to an intense infrared thermal continuum able to account for the 5 μ bump. Finally this model could solve the "Fell problem".

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