Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...75..719k&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 75, March 1991, p. 719-750. Research supported by University of M
Astronomy and Astrophysics
Astrophysics
115
Active Galactic Nuclei, Active Galaxies, Quasars, Seyfert Galaxies, Ultraviolet Spectra, Autocorrelation, Carbon, Iue, Monte Carlo Method, Photoionization
Scientific paper
IUE archival data are used here to investigate the structure nad kinematics of the broad-line regions (BLRs) in nine AGN. It is found that the centroid of the line-continuum cross-correlation functions (CCFs) can be determined with reasonable reliability. The errors in BLR size estimates from CCFs for irregularly sampled light curves are fairly well understood. BLRs are found to have small luminosity-weighted radii, and lines of high ionization tend to be emitted closer to the central source than lines of low ionization, especially for low-luminosity objects. The motion of the gas is gravity-dominated with both pure inflow and pure outflow of high-velocity gas being excluded at a high confidence level for certain geometries.
Gaskell Martin C.
Koratkar Anuradha P.
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