Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..556r&link_type=abstract
In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oc
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, Black Holes (Astronomy), Interstellar Gas, Spectral Line Width, Stellar Spectra, Tides, Compton Effect, Gas Density, High Temperature Gases, Photoionization
Scientific paper
The structure and properties of freely expanding (unbound) remnant clouds irradiated by the central continuum source of an AGN are discussed. It is argued that an expanding remnant cloud fragments into cold clumps of gas (about 10,000 K) surrounded by hot gas at the Compton temperature when the ionization parameter, Xi, reaches the critical value of about 10. Subsequently the fraction of hot gas slowly increases while the ionization parameter of both components remains equal to Xi(c). Photoionization of cold gas in the outmoving and radially elongated remnant clouds produces a broad line region at a distance of 10 exp 16 to 10 exp 17 cm in Seyferts and about 10 exp 17 to 10 exp 18 cm in quasars. The broad line region has an outer boundary where the remnant clouds become optically thin to the ionizing radiation from the central source. It is suggested that the central continuum source will be obscured by a large remnant cloud on our line of sight.
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