A New Approach to Constrain Black Hole Spins in Active Galaxies Using Optical Reverberation Mapping

Abstract

A tight relation between the size of the broad-line region (BLR) and optical luminosity has been established in about 50 active galactic nuclei studied through reverberation mapping of the broad Hbeta emission line. The R_blr-L relation arises from simple photoionization considerations. Using a general relativistic model of an optically thick, geometrically thin accretion disk, we show that the ionizing luminosity jointly depends on black hole mass, accretion rate, and spin. The non-monotonic relation between the ionizing and optical luminosity gives rise to a complicated relation between the BLR size and the optical luminosity. We show that the reverberation lag of Hbeta to the varying continuum depends very sensitively to black hole spin. For retrograde spins, the disk is so cold that there is a deficit of ionizing photons in the BLR, resulting in shrinkage of the hydrogen ionization front with increasing optical luminosity, and hence shortened Hbeta lags. This effect is specially striking for luminous quasars undergoing retrograde accretion, manifesting in strong deviations from the canonical R_blr-L relation. This could lead to a method to estimate black hole spins of quasars and to study their cosmic evolution. At the same time, the small scatter of the observed R_blr-L relation for the current sample of reverberation-mapped active galaxies implies that the majority of these sources have rapidly spinning black holes.

arXiv comment6 pages, 5 figures, to appear in ApJL

References in corpus (25)

• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• A Catalog of Quasar Properties from SDSS DR7
• Nuclear Activity in Nearby Galaxies
• The Low-Luminosity End of the Radius-Luminosity Relationship for Active Galactic Nuclei
• Estimating Black Hole Masses in Active Galaxies Using the Halpha Emission Line
• Supermassive Black Holes in Active Galactic Nuclei. II. Calibration of the M-sigma Relationship for AGNs
• Reverberation Mapping of High-Luminosity Quasars: First Results
• Suzaku observations of 'bare' active galactic nuclei
• A rapidly spinning supermassive black hole at the centre of NGC 1365
• Coronal outflow dominated accretion discs: a new possibility for low luminosity black holes?
• The Spin of Supermassive Black Holes
• The Black Hole Mass Scale of Classical and Pseudo Bulges in Active Galaxies
• Hot Disk Corona and Magnetic Turbulence in Radio-Quiet Active Galactic Nuclei: Observational Constraints
• The evolution of active galactic nuclei and their spins
• A Systematic Analysis of Fe II Emission in Quasars: Evidence for Inflow to the Central Black Hole
• Geometric and Dynamical Models of Reverberation Mapping Data
• An accretion disc-corona model for X-ray spectra of active galactic nuclei
• A Bayesian Approach to Estimate the Size and Structure of the Broad-line Region in Active Galactic Nuclei Using Reverberation Mapping Data
• A new way to measure supermassive black hole spin in accretion disc dominated Active Galaxies
• Episodic Random Accretion and the Cosmological Evolution of Supermassive Black Hole Spins
• Constraints on the black hole spin in the quasar SDSS J094533.99+100950.1
• Cosmological Evolution of Supermassive Black Holes. II. Evidence for Downsizing of Spin Evolution
• Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars
• Vertical Structure and Coronal Power of Accretion Disks Powered by MRI Turbulence
• Radio Variability Survey of Very Low Luminosity Protostars

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• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IX 10 New Observations of Reverberation Mapping and Shortened H$\beta$ Lags
• The Radius-Luminosity Relationship Depends on Optical Spectra in Active Galactic Nuclei
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. V. A New Size-Luminosity Scaling Relation for the Broad-Line Region
• A selection effect boosting the contribution from rapidly spinning black holes to the Cosmic X-ray Background
• Rest-frame Optical Spectra and Black Hole Masses of 3<z<6 Quasars
• Can reverberation-measured quasars be used for cosmology?
• High metal content of highly accreting quasars
• Time-delay measurement of MgII broad line response for the highly-accreting quasar HE 0413-4031: Implications for the MgII-based radius-luminosity relation
• Radio-loudness along the quasar main sequence
• Black hole mass estimates in quasars - A comparative analysis of high- and low-ionization lines
• Asymmetric emission of the [OIII]$\lambda$5007 profile in narrow-line Seyfert 1 galaxies
• Interpretation of Departure from the Broad Line Region Scaling in Active Galactic Nuclei
• Scatter Analysis Along the Multidimensional Radius-Luminosity Relations for Reverberation-Mapped Mg II Sources
• An extended size-luminosity relation for the reverberation-mapped AGNs: the role of the accretion rate
• High Eddington quasars as discovery tools: current state and challenges
• Extreme quasars as distance indicators in cosmology
• Systematically smaller single-epoch quasar black hole masses using a radius-luminosity relationship corrected for spectral bias
• The Most Massive Active Galactic Nuclei at $1\lesssim z\lesssim 2$
• The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 $\le$ z $\le$ 5.4
• Linear Spectropolarimetric Analysis of Fairall 9 with VLT/FORS2
• Robust Supermassive Black Hole Spin Mass-Energy Characteristics: A New Method and Results
• Dust Reverberation Mapping and Light-Curve Modelling of Zw229-015
• Rarefied Broad-Line Regions in Active Galactic Nuclei: Anomalous Responses in Reverberation Mapping and Implications for Weak Emission-Line Quasars
• Reverberation Mapping of Two Luminous Quasars: the Broad-line Region Structure and Black Hole Mass