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primary topic: Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion

Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion
type: Article
abstract: We study the role of convection in black hole accretion flows. We investigate the influence of convection on the energy transport as well as the effect of convective turbulence on the disk’s viscosity. The results reveal that convection supports the radiative energy transport efficiently in massless disks, while it can turn into a negative feedback if self-gravity becomes important. Convective turbulence adds significantly to the total viscosity, but cannot account for it on its own. In the second part, we study the spectral energy distribution of super-Eddington accretion flows onto a black hole, based on 2D RHD simulation data. We model the continuum emission as well as the iron K line emission and absorption features with a ray-tracing radiative transfer code. We find that mild relativistic beaming effects become important, leading to super-Eddington luminosities for face-on seen disks. We confirm the diagnostic power of the iron K lines on the accretion process in the inner disk region, finding a strong correlation between the central black hole mass and the ratio of the Kβ to the Kα lines. We also detect a trend of line broadening for edge-on seen disks.
date: 2008
status: published
author list: authors
type: EPrint
type: DoctoralThesisEPrint
is part of: repository
has document: Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion (PDF)
has document: Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion (Other)
subject: 520 Astronomie

Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion (PDF)
type: Document
has file: phd_thesis.pdf
has part: phd_thesis.pdf

Dominikus Heinzeller
type: Person
given name: Dominikus
family name: Heinzeller

Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion (Other)
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Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion (Other)
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Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion (Other)
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Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion (Other)
type: Document
is version of: Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion (PDF)
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Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion (Other)
type: Document
is version of: Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion (PDF)
is volatile version of: Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion (PDF)
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HTML Summary of #8575 Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion
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primary topic: Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion

520 Astronomie
type: Concept
preferred label: 520 Astronomy and allied sciences @en