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.

arXiv comment7 pages, 4 tables, 4 figures, accepted by MNRAS

References in corpus (22)

• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars
• The Fifth Data Release of the Sloan Digital Sky Survey
• The Sloan Digital Sky Survey Quasar Catalog IV. Fifth Data Release
• CIV 1549 as an Eigenvector 1 Parameter for Active Galactic Nuclei
• The Black Hole Mass - Galaxy Bulge Relationship for QSOs in the SDSS DR3
• Constraining ${\Omega }_M$ and Dark Energy with Gamma-Ray Bursts
• Continuum and Emission Line Strength Relations for a large Active Galactic Nuclei Sample
• On Quasar Masses and Quasar Host Galaxies
• On the dependence of the iron K-line profiles with luminosity in Active Galactic Nuclei
• An X-ray Baldwin effect for the narrow Fe K-alpha lines observed in Active Galactic Nuclei
• Average UV Quasar Spectra in the Context of Eigenvector 1: A Baldwin Effect Governed by Eddington Ratio?
• The Correlation of Narrow Line Emission and X-ray Luminosity in Active Galactic Nuclei
• Active Galactic Nuclei Emission-Line Properties Versus Eddington Ratio
• Narrow Iron K$\alpha$ Lines in Active Galactic Nuclei: Evolving Populations?
• The correlation of line strength with luminosity and redshift from composite QSO spectra
• On the origin of the C IV Baldwin effect in AGN
• The Baldwin Effect and Black Hole Accretion: A Spectral Principal Component Analysis of a Complete QSO Sample
• Quasar Evolution and the Baldwin Effect in the Large Bright Quasar Survey
• The black hole--bulge relation in AGNs
• The Relationship Between the High Energy Continuum and Emission Lines in QSOs: A Low-Redshift Sample

Cited by in corpus (20)

• Unification of Luminous Type 1 Quasars through CIV Emission
• Evidence for non-evolving FeII/MgII ratios in rapidly accreting z~6 QSOs
• Analysis of optical Fe II emission in a sample of AGN spectra
• Weak Emission Line Quasars in the Context of a Modified Baldwin Effect
• A Simple Disk Wind Model for Broad Absorption Line Quasars
• Star Formation in Luminous Quasars at 2<z<3
• The CIV Baldwin effect in QSOs from Seventh Data Release of the Sloan Digital Sky Survey
• Spectral Evolution in High Redshift Quasars from the Final BOSS Sample
• Ultraviolet Continuum Color Variability of Luminous Sloan Digital Sky Survey QSOs
• The intrinsic Baldwin effect in broad Balmer lines of six long-term monitored AGNs
• An extensive study of blazar broad emission line: Changing-look blazars and Baldwin effect
• Potential signature of Population III pair-instability supernova ejecta in the BLR gas of the most distant quasar at z = 7.54
• The environment of weak emission-line quasars
• 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
• Baldwin Effect and Additional BLR Component in AGN with Superluminal Jets
• More variable quasars have stronger emission lines
• The Spectroscopic Signature of Variability in High-Redshift 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