There is now agreement, within a few % as to the distance to NGC 5128, making it possible to interpret observed properties with new confidence.
Although there is still debate as to whether this is an S0p or Ep galaxy, the properties of its halo and individual stars are consistent with classifying NGC 5128 as an Ep.
We have a sample of ~ 600 globular clusters confirmed by radial velocity and/or angular resolution, approximately 50% of the estimated total population. Roughly half of these are metal-rich and the majority are old.
In spite of these numbers, global properties of the system are not well known because of major biases in the spatial coverage.
Observations of the spatial structure of > 200 GCs shows that they follow the same fundamental plane relation as do GCs in the Milky Way and M31. The NGC 5128 system allows us to trace this relation to higher GC luminosity and mass than we can in the Milky Way or M31.
Over a wide range in galactocentric distance, the halo stars are remarkably similar and predominantly metal-rich; and it appears that these metal-rich stars are old, possibly with ages similar to those of the metal-rich GCs. We may need to observe the halo to galactocentric distances twice that of current datasets in order to uncover its metal-poor component.
GLHH acknowledges financial support through a research grant from the Natural Sciences and Engineering Research Council of Canada. The beginnings of this paper were developed during a visit to ESO Garching, sponsored through the ESO visitor programme.