Publication date: Dec 2015
Abstract:
We investigate a model of a ringed accretion disk, made up by several
rings rotating around a supermassive Kerr black hole attractor. Each
toroid of the ringed disk is governed by the general relativity
hydrodynamic Boyer condition of equilibrium configurations of rotating
perfect fluids. Properties of the tori can then be determined by an
appropriately defined effective potential reflecting the background Kerr
geometry and the centrifugal effects. The ringed disks could be created
in various regimes during the evolution of matter configurations around
supermassive black holes. Therefore, both corotating and counterrotating
rings have to be considered as being a constituent of the ringed disk.
We provide constraints on the model parameters for the existence and
stability of various ringed configurations and discuss occurrence of
accretion onto the Kerr black hole and possible launching of jets from
the ringed disk. We demonstrate that various ringed disks can be
characterized by a maximum number of rings. We present also a
perturbation analysis based on evolution of the oscillating components
of the ringed disk. The dynamics of the unstable phases of the ringed
disk evolution seems to be promising in relation to high-energy
phenomena demonstrated in active galactic nuclei.
Authors:
Pugliese, D.; Stuchlík, Z.;