Black hole mass estimates in quasars - A comparative analysis of high- and low-ionization lines

Abstract

The inter-line comparison between high- and low-ionization emission lines has yielded a wealth of information on the quasar broad line region (BLR) structure and dynamics, including perhaps the earliest unambiguous evidence in favor of a disk + wind structure in radio-quiet quasars. We carried out an analysis of the CIV 1549 and Hbeta line profiles of 28 Hamburg-ESO high luminosity quasars and of 48 low-z, low luminosity sources in order to test whether the high-ionization line CIV 1549 width could be correlated with Hbeta and be used as a virial broadening estimator. We analyze intermediate- to high-S/N, moderate resolution optical and NIR spectra covering the redshifted CIV and H$\beta$ over a broad range of luminosity log L ~ 44 - 48.5 [erg/s] and redshift (0 - 3), following an approach based on the quasar main sequence. The present analysis indicates that the line width of CIV 1549 is not immediately offering a virial broadening estimator equivalent to H$\beta$. At the same time a virialized part of the BLR appears to be preserved even at the highest luminosities. We suggest a correction to FWHM(CIV) for Eddington ratio (using the CIV blueshift as a proxy) and luminosity effects that can be applied over more than four dex in luminosity. Great care should be used in estimating high-L black hole masses from CIV 1549 line width. However, once corrected FWHM(CIV) values are used, a CIV-based scaling law can yield unbiased MBH values with respect to the ones based on H$\beta$ with sample standard deviation ~ 0.3 dex.

43 pages, 15 Figures, submitted to A&A

References in corpus (22)

• The diversity of quasars unified by accretion and orientation
• CIV 1549 as an Eigenvector 1 Parameter for Active Galactic Nuclei
• The WISSH Quasars Project I. Powerful ionised outflows in hyper-luminous quasars
• Correcting CIV-Based Virial Black Hole Masses
• Black-Hole Mass and Growth Rate at High Redshift
• Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-Line Analysis for NGC 5548
• The effect of nuclear gas distribution on the mass determination of supermassive black holes
• Self-shadowing Effects of Slim Accretion Disks in Active Galactic Nuclei: Diverse Appearance of the Broad-line Region
• Double-peaked profiles: ubiquitous signatures of disks in the Broad Emission Lines of Active Galactic Nuclei
• Hbeta Profiles in Quasars: Evidence for an Intermediate-line Region
• VLT/ISAAC Spectra of the H-beta Region in Intermediate-Redshift Quasars II. Black Hole Mass and Eddington Ratio
• Detection of Rest-frame Optical Lines from X-shooter Spectroscopy of Weak Emission Line Quasars
• What does Civλ1549 tell us about the physical driver of the Eigenvector Quasar Sequence?
• Interpreting broad emission-line variations I : Factors influencing the emission-line response
• Dissecting the quasar main sequence: insight from host galaxy properties
• Virial Masses of Black Holes from Single Epoch Spectra of AGN
• GTC Spectra of z ~ 2.3 Quasars: Comparison with Local Luminosity Analogues
• OI and CaII observations in intermediate redshift quasars
• CIV and CIII] reverberation mapping of the luminous quasar PG 1247+267
• A New Approach to Constrain Black Hole Spins in Active Galaxies Using Optical Reverberation Mapping
• 3C 57 as an Atypical Radio-Loud Quasar: Implications for the Radio-Loud/Radio-Quiet Dichotomy
• A new method to obtain the Broad Line Region size of high redshift quasars

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• Early formation of supermassive black holes from the collapse of strongly self-interacting dark matter
• Probing the He II re-Ionization ERa via Absorbing C IV Historical Yield (HIERACHY) I: A Strong Outflow from a z~4.7 Quasar
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• Unravelling the nature of the dual AGN in the galaxy pair system IRAS 05589+2828 and 2MASX J06021107+2828382
• Optical and UV properties of a radio-loud and a radio-quiet Population A quasar at high redshift
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