Other
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..113c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 1, 1983, p. 113-124.
Other
31
Astronomical Models, Emission Spectra, Forbidden Bands, Quasars, Seyfert Galaxies, Spectral Line Width, Gas Density, Molecular Clouds, Molecular Gases, Radiant Flux Density, Spectrum Analysis
Scientific paper
The authors examine the forbidden line spectrum of quasars and Seyfert galaxies in light of the various proposed kinematic models for the broad-line regions of these objects. Gravitational infall models predict significant forbidden line emission at velocities ≤103 km s-1. Different emission line widths are obtained for different lines, dependent upon their respective critical densities for collisional deexcitation; lines with higher critical densities will have broader profiles. Ballistic outflow and radiative acceleration models, on the other hand, are found to produce negligible forbidden line emission at these velocities. Forbidden line profiles and total intensities for a specific model, the parabolic-orbital kinematic model, are presented and compared with existing observations.
Carroll Timothy J.
Kwan Juliana
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