Structure in the velocity space of globular clusters

We present an analysis of the velocity space of a sample of globular cluste rs (GC) with absolute proper motions. The vertical component of the velocit y is found to be correlated with luminosity and galactocentric radius. We d ivided the sample into two luminosity groups above and below the peak of th e luminosity function (LF), M-v = -7.5, for Galactic GCs, The two groups di splay different kinematic behaviour according to the first and second stati tical moments of the velocity distribution as well as distinct velocity ell ipsoids. The velocity ellipsoid of the high luminosity clusters is aligned with the symmetry axes of the Galaxy, whereas the minor axis of the Low Lum inosity group is strongly inclined relative to the Galactic rotation axis.