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Impact of Radiative Diffusion on the Magnetorotational Instability in Accretion Discs

Published online by Cambridge University Press:  20 January 2011

H. Wozniak ,
G. Hensler ,
M. Flaig ,
R. Kissmann  and
W. Kley
M. Flaig
Affiliation:
Eberhard-Karls Universität Tübingen, Institut für Astronomie & Astrophysik, Abt. Computational Physics, Auf der Morgenstelle 10, 72076 Tübingen, Germany
R. Kissmann
Affiliation:
Eberhard-Karls Universität Tübingen, Institut für Astronomie & Astrophysik, Abt. Computational Physics, Auf der Morgenstelle 10, 72076 Tübingen, Germany
W. Kley
Affiliation:
Eberhard-Karls Universität Tübingen, Institut für Astronomie & Astrophysik, Abt. Computational Physics, Auf der Morgenstelle 10, 72076 Tübingen, Germany
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Abstract

We investigate the influence of radiative transport on the growth of the magnetorotational instability (MRI) in accretion discs. A general dispersion relation describing the growth of small disturbances on a homogeneous background shear flow is provided. It includes compressibility and radiative effects in the flux-limited diffusion approximation. All the effects of radiation transport can be subsumed into one single parameter, an effective speed of sound. Radiative diffusion does not affect the region where the MRI operates, but it alters the growth rates of the MRI either by increasing or decreasing them. We report about corresponding numerical simulations, which are also used for a first investigation of the non-linear stage of the MRI in gas-pressure dominated accretion discs with radiation transport included.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 44: JENAM 2008: Grand Challenges in Computational Astrophysics , 2010 , pp. 117 - 120
Copyright
© EAS, EDP Sciences 2011

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References

Références

Balbus, S.A., & Hawley, J.F., 1991, ApJ, 376, 214 CrossRef
Flaig, M., Kissmann, R., & Kley, W., 2008, MNRAS, submitted
Fromang, S., & Nelson, R.P., 2006, A&A, 457, 343
Hawley, J.F., et al., 1995, ApJ, 440, 742 CrossRef
Hawley, J.F., 2000, ApJ, 528, 462 CrossRef
Kissmann, R., 2006, PhD. Thesis, Ruhr-Universität Bochum
Shakura, N.I., & Syunyaev, R.A., 1973, A&A, 24, 337