To the top

Page Manager: Webmaster
Last update: 9/11/2012 3:13 PM

Tell a friend about this page
Print version

Stability of radiation-pr… - University of Gothenburg, Sweden Till startsida
To content Read more about how we use cookies on

Stability of radiation-pressure dominated disks: I. the dispersion relation for a delayed heating α-viscosity prescription

Journal article
Authors A. Ciesielski
M. Wielgus
W. Kluźniak
A. Sa̧dowski
Marek A Abramowicz
J. P. Lasota
P. Rebusco
Published in Astronomy and Astrophysics
Volume 538
ISSN 00046361
Publication year 2012
Published at Department of Physics (GU)
Language en
Keywords accretion, accretion disks, hydrodynamics, instabilities
Subject categories Physical Sciences


We derive and investigate the dispersion relation for accretion disks with retarded or advanced heating. We follow the α-prescription but allow for a time offset τ between heating and pressure perturbations, as well as for a diminished response of heating to pressure variations. We study in detail solutions of the dispersion relation for disks with radiation-pressure fraction, 1-β, and ξ, the ratio of viscous stress response to pressure perturbations. For τ < 0 (advanced heating) the number and sign of real solutions for the growth rate depend on the values of τ, and ξ: if the magnitude of τ is larger than a critical value (e.g., more than twice the thermal time,-τ > 2 τ th, for β = 0 and ξ = 1) two real solutions exist, which are both negative. These results imply that radiation-pressure dominated accretion disks may be stabilized when there is a time delay between stress fluctuations and fluctuations in heating. © 2012 ESO.

Page Manager: Webmaster|Last update: 9/11/2012

The University of Gothenburg uses cookies to provide you with the best possible user experience. By continuing on this website, you approve of our use of cookies.  What are cookies?