Criterions for retrograde rotation of accreting black holes
  Rotating supermassive black holes produce jets and their origin is connected
to magnetic field that is generated by accreting matter flow. There is a point
of view that electromagnetic fields around rotating black holes are brought to
the hole by accretion. In this situation the prograde accreting disks produce
weaker large-scale black hole threading magnetic fields, implying weaker jets
that in retrograde regimes. The basic goal of this paper is to find the best
candidates for retrograde accreting systems in observed active galactic nuclei.
We show that active galactic nuclei with low Eddington ratio are really the
best candidates for retrograde systems. This conclusion is obtained for
kinetically dominated FRII radio galaxies, flat spectrum radio loud narrow line
Seyfert I galaxies and a number of nearby galaxies. Our conclusion is that the
best candidates for retrograde systems are the noticeable population of active
galactic nuclei in the Universe. This result corresponds to the conclusion that
in the merging process the interaction of merging black holes with a retrograde
circumbinary disk is considerably more effective for shrinking the binary
system.
