Outflows of stars due to quasar feedback
  Quasar feedback outflows are commonly invoked to drive gas out of galaxies in
the early gas-rich epoch to terminate growth of galaxies. Here we present
simulations that show that AGN feedback may drive not only gas but also stars
out of their host galaxies under certain conditions. The mechanics of this
process is as following: (1) AGN-driven outflows accelerate and compress gas
filling the host galaxy; (2) the accelerated dense shells become
gravitationally unstable and form stars on radial trajectories. For the
spherically symmetric initial conditions explored here, the black hole needs to
exceed the host's M_sigma mass by a factor of a few to accelerate the shells
and the new stars to escape velocities. We discuss potential implications of
these effects for the host galaxies: (i) radial mixing of bulge stars with the
rest of the host; (ii) contribution of quasar outflows to galactic fountains as
sources of high-velocity clouds; (iii) wholesale ejection of hyper velocity
stars out of their hosts, giving rise to type II supernovae on galactic
outskirts, and contributing to reionization and metal enrichment of the
Universe; (iv) bulge erosion and even complete destruction in extreme cases
resulting in overweight or bulgeless SMBHs.
