We present radial velocity measurements for 74 globular clusters ( GCs ) in the nearby giant elliptical NGC 5128 , of which 31 are newly discovered clusters .
All the GC candidates were taken from the list of possible new clusters given in the Harris , Harris , & Geisler ( 5 ) photometric survey .
In addition to the newly confirmed clusters , we identified 24 definite foreground stars and 31 probable background galaxies .
From a combined list of 299 known GCs in NGC 5128 with measured radial velocities and metallicity-sensitive ( C - T _ { 1 } ) photometric indices , we construct a new metallicity distribution function ( MDF ) for the cluster system .
The MDF shows an approximately bimodal form , with centroids at [ Fe / H ] = -1.46 and -0.53 , and with nearly equal numbers of metal-poor and metal-rich clusters in the two modes .
However , there are many intermediate-color clusters in the distribution , and the fainter clusters tend to have a higher proportion of red clusters .
These features of the MDF may indicate a widespread age range within the cluster system as well as an intrinsically broad metallicity spread .