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- W2087516592 abstract "We investigate the relations between the observed emission-line strengths, widths, and continuum properties of a sample of 41 low-redshift (z<1) quasars for which contemporaneous IR/soft X-ray spectral energy distributions are available. This includes investigating correlations between optical and UV lines with both the luminosity and the shape of the quasars' continuum, as well as correlations between the various lines. The sample is heterogeneous, primarily selected on the existence of good-quality Einstein X-ray data, and includes 18 radio-loud and 23 radio-quiet quasars. We find anticorrelations between the equivalent width and various UV luminosities (the Baldwin effect) for the Lyα and Hβ lines and a marginal anticorrelation for C III]. Exclusion of narrow-line, low-luminosity active galactic nuclei reveals a significant Baldwin effect for the C IV and C III] lines. A significant anticorrelation of EW(C IV) with αox is also present. We find no correlations between any lines and the X-ray luminosity or X-ray slope. The Fe II optical multiplet shows no simple relationship with luminosity or continuum slope; however, there is a tendency for objects with flat X-ray spectra and/or strong X-ray luminosities to have weak Fe II." @default.
- W2087516592 created "2016-06-24" @default.
- W2087516592 creator A5035624125 @default.
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- W2087516592 creator A5044482994 @default.
- W2087516592 creator A5047273464 @default.
- W2087516592 creator A5088633481 @default.
- W2087516592 date "1999-03-01" @default.
- W2087516592 modified "2023-10-16" @default.
- W2087516592 title "Investigation of the Relation between the Spectral Energy Distributions and the Emission Lines in Low‐Redshift Quasars" @default.
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- W2087516592 doi "https://doi.org/10.1086/306828" @default.
- W2087516592 hasPublicationYear "1999" @default.