Gravitational Recoil From Accretion-Aligned Black-Hole Binaries
  We explore the newly discovered "hangup-kick" effect, which greatly amplifies
the recoil for configuration with partial spin- orbital-angular momentum
alignment, by studying a set of 48 new simulations of equal-mass, spinning
black-hole binaries. We propose a phenomenological model for the recoil that
takes this new effect into account and then use this model, in conjunction with
statistical distributions for the spin magnitude and orientations, based on
accretion simulations, to find the probabilities for observing recoils of
several thousand km/s. In addition, we provide initial parameters,
eccentricities, radiated linear and angular momentum, precession rates and
remnant mass, spin, and recoils for all 48 configurations. Our results indicate
that surveys exploring peculiar (redshifted or blueshifted) differential
line-of-sight velocities should observe at least one case above 2000 km/s out
of four thousand merged galaxies. The probability that a remnant BH receives a
total recoil exceeding the ~2000 km/s escape velocity of large elliptical
galaxies is ten times larger. Probabilities of recoils exceeding the escape
velocity quickly rise to 5% for galaxies with escape velocities of 1000 km/s
and nearly 20% for galaxies with escape velocities of 500 km/s. In addition the
direction of these large recoils is strongly peaked toward the angular momentum
axis, with very low probabilities of recoils exceeding 350 km/s for angles
larger than 45 deg. with respect to the orbital angular momentum axis.
