High velocity stars from close interaction of a globular cluster and a
  super massive black hole
  Observations show the presence, in the halo of our Galaxy, of stars moving at
velocities so high to require an acceleration mechanism involving the presence
of a massive central black hole. Thus, in the frame of a galaxy hosting a
supermassive black hole ($10^8$ $M_{\odot}$) we investigated a mechanism for
the production of high velocity stars, which was suggested by the results of
N-body simulations of the close interaction between a massive, orbitally
decayed, globular cluster and the super massive black hole. The high velocity
acquired by some stars of the cluster comes from the transfer of gravitational
binding energy into kinetic energy of the escaping star originally orbiting
around the cluster. After the close interaction with the massive black hole,
stars could reach a velocity sufficient to travel in the halo and even overcome
the galactic gravitational well, while some of them are just stripped from the
globular cluster and start orbiting on precessing loops around the galactic
centre.
