Spin Properties of Supermassive Black Holes with Powerful Outflows
  Relationships between beam power and accretion disk luminosity are studied
for a sample of 55 HERG, 13 LERG, and 29 RLQ with powerful outflows. The ratio
of beam power to disk luminosity tends to be high for LERG, low for RLQ, and
spans the full range of values for HERG. Writing general expressions for the
disk luminosity and beam power and applying the empirically determined
relationships allows a function that parameterizes the spins of the holes to be
estimated. Interestingly, one of the solutions that is consistent with the data
has a functional form that is remarkably similar to that expected in the
generalized Blandford-Znajek model with a magnetic field that is similar in
form to that expected in MAD and ADAF models. Values of the spin function,
obtained independent of specific outflow models, suggest that spin and AGN type
are not related for these types of sources. The spin function can be used to
solve for black hole spin in the context of particular outflow models, and one
example is provided.
