Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257..499b&link_type=abstract
Astrophysical Journal, Part 1, vol. 257, June 15, 1982, p. 499-508.
Astronomy and Astrophysics
Astrophysics
61
Astronomical Spectroscopy, Luminosity, Quasars, Radio Spectra, Red Shift, X Ray Sources, Emission Spectra, Galactic Nuclei, H Beta Line, Light Emission, Seyfert Galaxies, Spectral Line Width
Scientific paper
A sample of 26 low-redshift quasars was examined for relationships between X-ray luminosity and optical spectroscopic features; all quasars were observed with the Einstein Observatory and with the IDS on the Lick 3 meter telescope. Evidence is found for correlations between quasar X-ray luminosity and both optical continuum luminosity and H-beta luminosity. In the latter case, there is a smooth relationship connecting quasars, Seyfert 1, and Seyfert 2 galaxies. For the quasars in this sample, there is also a strong correlation between optical continuum luminosity and both the H-beta luminosity and equivalent width. Evidence is also found for a weak correlation between alpha-prime (ox), the mean continuum spectral index between 5000 A and 2 keV, and Fe II equivalent width, H-beta equivalent width, H-beta line width at zero intensity, and the ratio of H-beta equivalent width to its line width at zero intensity.
Blumenthal George R.
Keel William C.
Miller Jeffrey S.
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