Two-phase accretion model for emission-line regions in quasars and active galactic nuclei

Details Two-phase accretion model for emission-line regions in quasars and active galactic nuclei Two-phase accretion model for emission-line regions in quasars and active galactic nuclei

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..206w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 1, 1985, p. 206-216.

Astronomy and Astrophysics

Astronomy

9

Active Galactic Nuclei, Black Holes (Astronomy), Quasars, Stellar Mass Accretion, Astronomical Models, Asymptotic Methods, Interstellar Gas, Mach Number, Photoionization

Scientific paper

A model is constructed for the broad-line region of quasars and active galactic nuclei. A two-phase medium, made of cool photoionized filaments embedded in a hot gas, and assumed to be in a quasi-spherical infall, is producing the line emission, as well as supplying the mass needed to power the central continuum sources. Taking into account conduction and radiative cooling in the filaments, an asymptotic solution is found, in which the ionization parameter in the clouds is almost independent of the distance from the central source. This can reproduce the observed feature that lines of different excitation levels have similar profiles. A new relation is found between the efficiency of the central source and the dimensionless accretion rate, and the efficiency is expressed in terms of observable quantities. The observational data on the emission lines imply high central masses, 10 to the 7th-10 to the 10th solar masses; 0.3 - 1000 solar masses per year; and low efficiencies, e approximately equal to or less than 0.001.

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