Publication date: Mar 2018
Abstract:
Super-massive black holes (SMBHs) hosted in active galactic nuclei
(AGNs) can be characterized by multi-accreting periods as the attractors
interact with the environment during their life-time. These multi-
accretion episodes should leave traces in the matter orbiting the
attractor. Counterrotating and even misaligned structures orbiting
around the SMBHs would be consequences of these episodes. Our task in
this work is to consider situations where such accretions occur and to
trace their remnants represented by several toroidal accreting fluids,
corotating or counterrotating relative to the central Kerr attractor,
and created in various regimes during the evolution of matter
configurations around SMBHs. We focus particularly on the emergence of
matter instabilities, i.e., tori collisions, accretion onto the central
Kerr black hole, or creation of jet-like structures (proto-jets). Each
orbiting configuration is governed by the general relativistic
hydrodynamic Boyer condition of equilibrium configurations of rotating
perfect fluid. We prove that sequences of configurations and hot points,
where an instability occurs, characterize the Kerr SMBHs, depending
mainly on their spin-mass ratios. The occurrence of tori accretion or
collision are strongly constrained by the fluid rotation with respect to
the central black hole and the relative rotation with respect to each
other. Our investigation provides characteristic of attractors where
traces of multi-accreting episodes can be found and observed.
Authors:
Pugliese, D.; Stuchlík, Z.;