A bound on galactic mass loss rates obtaind from globular cluster   dynamics
  Using tidal disruption of globular clusters by the galactic center, we put limits on the total mass ever enclosed into orbits of observed globular clusters. Under the assumption that the rate of mass loss from the Galaxy is steady, we then deduce a bound on this rate. In particular this bound can be used to constrain the galactic gravitational wave luminosity. 
Florian Dubath, Anna Rissone