The Origin and Evolution of \civ Baldwin Effect in QSOs from the Sloan Digital Sky Survey

Abstract

Using a large sample of 26623 quasars with redshifts in the range $1.5\le z\le 5.1$ with \civ $\lambda$1549 Åemission line in Fifth Data Release of the Sloan Digital Sky Survey (SDSS), we investigate the cosmological evolution of the Baldwin Effect, i.e. the relation between the equivalent width (EW) of the \civ emission line and continuum luminosity. We confirm the earlier result that there exists a strong correlation between the \civ EW and the continuum luminosity, and we find that, up to $z\approx 5$, the slope of the Baldwin Effect seems to have no effect of cosmological evolution. A sub-sample of 13960 quasars with broad \civ $\lambda$1549 Åemission line from SDSS is used to explore the origin of the Baldwin Effect. We find that \civ EW have a strong correlation with the mass of supermassive black hole (SMBH), and a weak correlation with the Eddington ratio, $\lb/\ledd$. This suggests that the SMBH mass is probably the primary drive for the Baldwin Effect.

7 pages, 4 tables, 4 figures, accepted by MNRAS

References in corpus (3)

• The Sloan Digital Sky Survey Quasar Catalog IV. Fifth Data Release
• CIV 1549 as an Eigenvector 1 Parameter for Active Galactic Nuclei
• The Correlation of Narrow Line Emission and X-ray Luminosity in Active Galactic Nuclei

Cited by in corpus (7)

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• An extensive study of blazar broad emission line: Changing-look blazars and Baldwin effect
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• The underlying driver for the \civ Baldwin effect in QSOs with $0<z<5$
• Mg II and Fe II fluxes of luminous quasars at z ~ 2.7 and evaluation of the Baldwin effect in the flux-to-abundance conversion method for quasars
• A measure of cosmological distance using the \civ\ Baldwin effect in quasars
• The Relationship Between Emission Line and Continuum Luminosity and the Baldwin Effect in Blazars. I. The Case of the Mg II λ2798 Å Emission Line