Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..145k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 1, 1987, p. 145-153.
Astronomy and Astrophysics
Astrophysics
37
Quasars, Seyfert Galaxies, Ultraviolet Spectra, Line Spectra, Lyman Alpha Radiation, Red Shift, Spectral Line Width
Scientific paper
This paper completes the analysis of an IUE survey of intermediate-redshift QSOs for which the results on Ly-alpha and continuum properties were given previously. The weaker lines were measured and are discussed in the context of an extended sample including Seyfert galaxies and high-redshift QSOs. The EW(C IV) anticorrelates with the luminosity of the continuum at 1450 A, showing the well-known Baldwin effect. The slopes of the two relations differ slightly, which can be explained by a decrease in the ionization parameter with increasing luminosity. Weak lines of Ly-beta + O VI, N V, and semiforbidden Si IV + O IV were measured in improved spectra for two of the sample objects, 1100 + 772 and 2201 + 315. The Ly-alpha line in both objects is highly symmetrical, with N V contribution of 5 percent or less. The line shapes were fitted with a two-component profile; 1100 + 772 has a distinct narrow component which contributes 20-25 percent of the Ly-alpha flux.
Bregman Joel N.
Glassgold Alfred E.
Huggins Patrick J.
Kinney Anne L.
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