Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247....3s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 1, July 1991, p. 3-10.
Astronomy and Astrophysics
Astrophysics
25
Active Galactic Nuclei, Galactic Radiation, H Lines, Emission Spectra, Seyfert Galaxies, Spectral Line Width, Spectrum Analysis, Statistical Analysis
Scientific paper
High quality H-alpha and H-beta spectra of a sample of 29 Seyfert 1 galaxies and QSOs are used to study the statistical properties of broad emission lines. Median velocities, interpercentile velocities at 10, 20, and 50 percent and, forH-alpha, the corresponding asymmetry parameters are derived. A weak dependence of the IPVs on luminosity is found, which could be due to a mass-luminosity relation. Furthermore, a correlation exists between the IPVs and the steepness of the H-beta/H-alpha ratio as functions of velocity. This can be explained as a projection angle effect or as a scaling of velocities with central mass. Asymmetries of up to 20 percent are measured, but no strong predominance of red or blue ones is present.
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