Measuring Consistent Masses for 25 Milky Way Globular Clusters
  We present central velocity dispersions, masses, mass to light ratios
($M/L$s), and rotation strengths for 25 Galactic globular clusters. We derive
radial velocities of 1951 stars in 12 globular clusters from single order
spectra taken with Hectochelle on the MMT telescope. To this sample we add an
analysis of available archival data of individual stars. For the full set of
data we fit King models to derive consistent dynamical parameters for the
clusters. We find good agreement between single mass King models and the
observed radial dispersion profiles. The large, uniform sample of dynamical
masses we derive enables us to examine trends of $M/L$ with cluster mass and
metallicity. The overall values of $M/L$ and the trends with mass and
metallicity are consistent with existing measurements from a large sample of
M31 clusters. This includes a clear trend of increasing $M/L$ with cluster
mass, and lower than expected $M/L$s for the metal-rich clusters. We find no
clear trend of increasing rotation with increasing cluster metallicity
suggested in previous work.
