High velocity stars from the interaction of a globular cluster and a
  massive black hole binary
  High velocity stars are stars moving at velocities so high to require an
acceleration mechanism involving binary systems or the presence of a massive
central black hole. In the frame of a galaxy hosting a supermassive black hole
binary (of total mass $10^8$ M$_\odot$), we investigated a mechanism for the
production of high velocity stars due to the close interaction between a
massive and orbitally decayed globular cluster and the super massive black hole
binary. Some stars of the cluster acquire high velocities by conversion of
gravitational energy into kinetic energy deriving from their interaction with
the black hole binary. After the interaction, few stars reach a velocity
sufficient to overcome the galactic gravitational well, while some of them are
just stripped from the globular cluster and start orbiting around the galactic
centre.
