Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-03-04
Astronomy and Astrophysics
Astrophysics
7 pages, to appear in Proceedings of the 20th Texas Symposium on Relativistic Astrophysics
Scientific paper
10.1063/1.1419635
For the past twenty-five years, nearly all analyses of accretion disk dynamics have assumed that stress inside the disk is locally proportional to pressure (the "alpha-model") and that this stress goes to zero at the marginally stable orbit. Recently, it has been demonstrated that MHD turbulence accounts for the bulk of internal disk stress. In contradiction with the traditional view, the stress from this MHD turbulence does not diminish near the marginally stable orbit, and the ratio of magnetic stress to pressure rises sharply there. Examples of the consequences include: an increase in accretion efficiency that may also be time- and circumstance-dependent; a decrease in the rate of black hole spin-up by accretion; and generation of disk luminosity fluctuations. Preliminary results from numerical simulations lend support to analytic estimates of these effects.
No associations
LandOfFree
Magnetic Stresses at the Inner Edges of Accretion Disks Around Black Holes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetic Stresses at the Inner Edges of Accretion Disks Around Black Holes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic Stresses at the Inner Edges of Accretion Disks Around Black Holes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-660998