Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...375..503c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 375, July 10, 1991, p. 503-516. Ohio State University-supported research.
Astronomy and Astrophysics
Astrophysics
26
Emission Spectra, Line Shape, Quasars, Radio Spectra, Absorption Spectra, H Beta Line, Line Spectra, Red Shift
Scientific paper
Data on the emission-line properties of a sample of 45 intermediate redshift quasars with steep radio spectra are presented and compared with those of a sample of flat radio spectrum sources of comparable mean luminosity and redshift. The steep-spectrum sources have, on average, smaller widths of the C IV 1549 A and semiforbidden C III 1909 A line profiles, larger Mg II 2800 A equivalent widths, and smaller (He II and semiforbidden O III)/C IV intensity ratios than the flat-spectrum sources. The steep-spectrum sources have C IV profiles that tend to be asymmetric to the red, while those in the flat-spectrum sources are asymmetric to the blue. The Baldwin effect and the correlation between the Mg II-C IV and semiforbidden C III-C IV redshift differences reported elsewhere are also present both within the combined sample and among the steep-spectrum objects alone. These results support proposed unified models of steep and flat radio spectrum quasars.
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