Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371l..51c&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 371, April 20, 1991, p. L51-L54.
Astronomy and Astrophysics
Astrophysics
27
Active Galactic Nuclei, Emission Spectra, H Beta Line, Hydrogen Clouds, Luminous Intensity, Red Shift, Quasars, Seyfert Galaxies, Spectral Line Width
Scientific paper
Recently published IUE spectra of low-redshift QSOs and Seyfert 1 galaxies have permitted a comparison of the profiles of the C IV 1549A and H-beta broad emission lines. A linear correlation between the FWHM values of the profiles has been found in a sample of 19 objects and is verified to not be the result of separate correlations between these parameters and luminosity. Interpreted in terms of the geometry of the broad-line region, this result is contrary to models which predict low-ionization line emission from an optically thick, geometrically thin accretion disk surrounding the central object. Current evidence favors a model in which broad-line emission arises predominantly in a stratified ensemble of clouds moving radially relative to the central continuum source.
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