A characteristic optical variability timescale in astrophysical accretion disks

Abstract

Accretion disks around supermassive black holes in active galactic nuclei produce continuum radiation at ultraviolet and optical wavelengths. Physical processes in the accretion flow lead to stochastic variability of this emission on a wide range of timescales. We measure the optical continuum variability observed in 67 active galactic nuclei and the characteristic timescale at which the variability power spectrum flattens. We find a correlation between this timescale and the black hole mass, extending over the entire mass range of supermassive black holes. This timescale is consistent with the expected thermal timescale at the ultraviolet-emitting radius in standard accretion disk theory. Accreting white dwarfs lie close to this correlation, suggesting a common process for all accretion disks.

Author's version; 49 pages; Science (published Aug 13)

References in corpus (34)

• The Transiting Exoplanet Survey Satellite
• A Catalog of Quasar Properties from SDSS DR7
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• Modelling the behaviour of accretion flows in X-ray binaries
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• Active Galactic Nuclei: what's in a name?
• The AGN Black Hole Mass Database
• Is Quasar Optical Variability a Damped Random Walk?
• Testing thermal reprocessing in AGN accretion discs
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IV. H$\beta$ Time Lags and Implications for Super-Eddington Accretion
• Quasar Accretion Disks Are Strongly Inhomogeneous
• The Radius-Luminosity Relationship Depends on Optical Spectra in Active Galactic Nuclei
• A characteristic optical variability timescale in astrophysical accretion disks
• Limitations on the recovery of the true AGN variability parameters using Damped Random Walk modeling
• The variability plane of accreting compact objects
• Reverberation Mapping of the Seyfert 1 Galaxy NGC 7469
• Improving Damped Random Walk parameters for SDSS Stripe 82 Quasars with Pan-STARRS1
• Supermassive black holes with high accretion rates in active galactic nuclei. XI. Accretion disk reverberation mapping of Mrk 142
• Convection Causes Enhanced Magnetic Turbulence in Accretion Disks in Outburst
• A 10,000-solar-mass black hole in the nucleus of a bulgeless dwarf galaxy
• Reverberation Mapping of the Broad-line Region in NGC 5548: Evidence for Radiation Pressure?
• Opacity Driven Convection and Variability in Accretion Disks around Supermassive Black Holes
• The Mass of the Central Black Hole in the Nearby Seyfert Galaxy NGC5273
• A Reverberation-Based Black Hole Mass for MCG-06-30-15
• Accretion Disk Size Measurement and Time Delays in the Lensed Quasar WFI 2033-4723
• Dust Reverberation Mapping in Distant Quasars from Optical and Mid-Infrared Imaging Surveys
• A Low-Mass Black Hole in the Nearby Seyfert Galaxy UGC 06728
• Impact of convection and resistivity on angular momentum transport in dwarf novae
• Broad-line Region of the Quasar PG 2130+099 from a Two-Year Reverberation Mapping Campaign with High Cadence
• Optical Variability of the Dwarf AGN NGC 4395 from the Transiting Exoplanet Survey Satellite
• Calibrating Mg II-based black-hole mass estimators using Low-to-High-Luminosity Active Galactic Nuclei
• Multi-wavelength observations of SDSS J105621.45+313822.1, a broad-line, low-metallicity AGN

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• A candidate of binary black hole system in AGN with broad Balmer emission lines having quite different line widths
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• A Sample Bias in Quasar Variability Studies
• The Mass Distribution of Quasars in Optical Time-domain Surveys
• X-ray Flux and Spectral Variability of the Blazar OJ 287 with Suzaku
• Identification of Intermediate-mass Black Hole Candidates Among a Sample of Sd Galaxies
• Accretion disc reverberation mapping of the quasar 3C 273
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