Humpy LNRF-velocity profiles in accretion discs orbiting almost extreme Kerr black holes
نویسندگان
چکیده
منابع مشابه
Aligning spinning black holes and accretion discs
We consider the alignment torque between a spinning black hole and an accretion disc whose angular momenta are misaligned. This situation must hold initially in almost all gas accretion events on to supermassive black holes, and may occur in binaries where the black hole receives a natal supernova kick. We show that the torque always acts to align the hole’s spin with the total angular momentum...
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We re-derive the equation for vertical hydrodynamical equilibrium of stationary thin and slim accretion disks in the Kerr spacetime. All the previous derivations have been unsatisfactory, yielding unphysical singularities. Our equation is non-singular, more general, and simpler than those previously derived. Subject headings: accretion, accretion disks — black hole physics — hydrodynamics — rel...
متن کاملThe Efficiency of Using Accretion Power of Kerr Black Holes
Ioana Duţan1,3 and Peter L. Biermann2,3 1University of Bucharest, Faculty of Physics Str. Atomiştilor, 405, RO-76900, Bucureşti-Mǎgurele, România 2University of Bonn Regina-Pacis-Weg, 3, D-53113, Bonn, Germany 3Max-Planck-Institute for Radioastronomy Auf dem Hűgel, 69, D-53121, Bonn, Germany [email protected]; [email protected] Abstra t The e ien y of a rapidly spinning Kerr b...
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Standard accretion disk theory is formulated which is based on the local heat balance. The energy produced by a turbulent viscous heating is supposed to be emitted to the sides of the disc. Sources of turbulence in the accretion disc are connected with nonlinear hydrodynamic instability, convection, and magnetic field. In standard theory there are two branches of solution, optically thick, and ...
متن کاملThe evolution of misaligned accretion discs and spinning black holes
In this paper we consider the process of alignment of a spinning black hole and a surrounding misaligned accretion disc. We use a simplified set of equations, that describe the evolution of the system in the case where the propagation of warping disturbances in the accretion disc occurs diffusively, a situation likely to be common in the thin discs in Active Galactic Nuclei (AGN). We also allow...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20066270