2007ApJ...665L..31S

We combine radial velocities, proper motions, and low-resolution abundances for a sample of 315 K and M giants in the Baade's window (l, b) = (0.9°, -4°) Galactic bulge field. The velocity ellipsoid of stars with [Fe/H]>-0.5 dex shows a vertex deviation in the plot of radial versus transverse velocity, consistent with that expected from a population with orbits supporting a bar. We demonstrate that the significance of this vertex deviation, using nonparametric rank correlation statistic, is >99%. The velocity ellipsoid for the metal-poor ([FeH]←0.5) part of the population shows no vertex deviation and is consistent with an isotropic, oblate rotating population. We find no evidence of kinematic subgroups, but there is a mild tendency for the vertical velocity dispersion σ_b to decrease with increasing metallicity.