We present preliminary results of 2dF spectroscopy of globular clusters in The Sombrero ( M104 ) .
We find 56 new clusters , and compile a total sample of 103 velocities combined with previous data .
Our 2dF data extend out to 20 arcmin radius ( \sim 50 kpc ) , much further than previous studies .
In the combined sample , we tentatively find a steep drop in the velocity dispersion with radius , which might possibly indicate a truncated halo .
There is no obvious solid-body rotation over all radii , but separate fits for those clusters inside and outside 25 kpc radius show tantalizing evidence for counter-rotation .
The projected mass estimator with isotropic orbits yields an M104 mass of 1.2 \times 10 ^ { 12 } M \odot inside 50 kpc , and a ( M/L ) _ { B } = 30 : solid evidence for a dark matter halo in this galaxy .