Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225...55n&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 1, 1987, p. 55-72.
Astronomy and Astrophysics
Astronomy
114
Accretion Disks, Galactic Nuclei, Quasars, Spectral Line Width, Stellar Models, Balmer Series, Emission Spectra, Gas Ionization, Mass To Light Ratios, Photoionization, Ultraviolet Spectra
Scientific paper
The possibility of geometrically thin accretion discs in active galactic nuclei (AGNs) was discussed in Paper I of this series (H. Netzer, 1985). The apparent luminosity of such discs depends on the viewing angle and this may be the reason for the observed correlation of continuum brightness and line equivalent width. This idea is taken one step further in the present work and the emission line spectrum of a gas exposed to the anisotropic ionizing radiation of a disc is investigated. One example which is studied in detail is that of a disc UV continuum combined with an isotropic X-ray source. Analysis of the L-M relationship in AGNs, within the framework of the new model, shows that these objects have smaller central masses and higher accretion efficiencies compared with previous estimates. There are important consequences for the two-phase model and cloud formation, and specific predictions of the observed LUV/LX, which is angle dependent.
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