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We have obtained radial velocity measurements for 51 new globular clustersaround the Sombrero galaxy. These measurements were obtained usingspectroscopic observations from the AAOmega spectrograph on theAnglo-Australian Telescope and the Hydra spectrograph at WIYN. Combined withour own past measurements and velocity measurements obtained from theliterature we have constructed a large database of radial velocities thatcontains a total of 360 confirmed globular clusters. Previous studies' analysesof the kinematics and mass profile of the Sombrero globular cluster system havebeen constrained to the inner ~9' (~24 kpc or ~5 effective radii), but our newmeasurements have increased the radial coverage of the data, allowing us todetermine the kinematic properties of M104 out to ~15' (~41 kpc or ~9 effectiveradii). We use our set of radial velocities to study the GC system kinematicsand to determine the mass profile and V-band mass-to-light profile of thegalaxy. We find that the V-band mass-to-light ratio increases from 4.5 at thecenter to a value of 20.9 at 41 kpc (~9 effective radii or 15'), which impliesthat the dark matter halo extends to the edge of our available data set. Wecompare our mass profile at 20 kpc (~4 effective radii or ~7.4') to the masscomputed from x-ray data and find good agreement. We also use our data to lookfor rotation in the globular cluster system as a whole, as well as in the redand blue subpopulations. We find no evidence for significant rotation in any ofthese samples.

Beyond the Brim of the Hat: Kinematics of Globular Clusters out to Large Radius in the Sombrero Galaxy