Publication date: Apr 2017
Abstract:
We investigate ringed accretion disks composed of two tori (rings)
orbiting on the equatorial plane of a central supermassive Kerr black
hole. We discuss the emergence of the instability phases of each ring of
the macro-configuration (ringed disk) according to the Paczynski
violation of mechanical equilibrium. In the full general relativistic
treatment, we consider the effects of the geometry of the Kerr
spacetimes relevant to the characterization of the evolution of these
configurations. The discussion of ring stability in different spacetimes
enables us to identify particular classes of central Kerr attractors
depending on their dimensionless spin. As a result of this analysis, we
set constraints on the evolutionary schemes of the ringed disks relative
to the torus morphology and on their rotation relative to the central
black hole and to each other. The dynamics of the unstable phases of
this system is significant for the high-energy phenomena related to
accretion onto supermassive black holes in active galactic nuclei and
the extremely energetic phenomena in quasars, which could be observed in
their X-ray emission.
Authors:
Pugliese, D.; Stuchlík, Z.;