Stabilization of radiation pressure dominated accretion disks by viscous fluctuations

Abstract

The standard thin accretion disk model has been successfully used to explain the soft X-ray spectra of Galactic black hole systems and perhaps the UV emission of Active Galactic Nuclei. However, radiation pressure dominated disks are known to be viscously unstable and should produce large amplitude oscillations that are typically not observed. Instead, these sources exhibit stochastic variability which may naturally arise due to viscous fluctuations in a turbulent disk. Here we investigate whether these aperiodic viscous fluctuations can stabilize the inner radiation pressure dominated disks and hence maybe the answer to a forty year old problem in accretion disk theory.

6 pages, 6 figures; accepted to Astronomy and Astrophysics

References in corpus (6)

• Modelling the behaviour of accretion flows in X-ray binaries
• The faint "heartbeats" of IGR J17091-3624: an exceptional black-hole candidate
• Variability of black hole accretion discs: The cool, thermal disc component
• Accreting corona model of the X-ray variability in soft state X-ray binaries and active galactic nuclei
• Damped harmonic oscillator interpretation of the soft-state power spectra of Cyg X-1
• Modeling the UBVRI time delays in Mrk 335

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• General Overview of Black Hole Accretion Theory
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• Modified viscosity in accretion disks. Application to Galactic black hole binaries, intermediate mass black holes and AGN
• Interplay between heartbeat oscillations and wind outflow in microquasar IGR J17091-3624
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• Accretion in active galactic nuclei and disk-jet coupling
• The GALEX Time Domain Survey. II. Wavelength-Dependent Variability of Active Galactic Nuclei in the Pan-STARRS1 Medium Deep Survey
• Importance of magnetic fields in highly eccentric discs with applications to tidal disruption events
• Interpreting the large amplitude X-ray variation of GRS 1915+105 and IGR J17091-3624 as modulations of an accretion disc
• Collective $1/f$ fluctuation by pseudo-Casimir-invariants
• Modeling the response of a standard accretion disc to stochastic viscous fluctuations
• Turbulent fluctuations and the excitation of Z Cam outbursts
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