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Velocity dispersion measurements are presented for luminous GCs in NGC 5128derived from high-res. UVES spectra. The measurements are made with the pPXFcode that parametrically recovers line-of-sight velocity dispersions. Combiningthe measured velocity dispersions with surface photometry and structuralparameter data from HST enables both dynamical masses and M/L ratios to bederived. The fundamental plane relations of these clusters are investigated inorder to fill the apparent gap between the relations of Local Group GCs andmore massive early-type galaxies. It is found that the properties of thesemassive stellar systems match those of nuclear clusters in dwarf ellipticalgalaxies and UCDs better than those of Local Group GCs, and that all objectsshare similarly old (>8 Gyr) ages, suggesting a possible link between theformation and evolution of dE,Ns, UCDs and massive GCs. We find a very steepcorrelation between dynamical (M/L) ratio and dynamical mass of the form(M/L)_dyn ~ M_dyn^(0.24+/-0.02) above M_dyn = 2x10^6 Msol. Formation scenariosare investigated with a chemical abundance analysis using absorption linestrengths calibrated to the Lick/IDS index system. The results lend support totwo scenarios contained within a single general formation scheme. Old, massive,super-solar [alpha/Fe] systems are formed on short (<100 Myr) timescalesthrough the merging of single-collapse GCs which themselves are formed withinsingle, giant molecular clouds. More intermediate- and old-aged (~3-10 Gyr),solar- to sub-solar [alpha/Fe] systems are formed on much longer (~Gyr)timescales through the stripping of dE,Ns in the 10^13-10^15 Msol potentialwells of massive galaxies and galaxy clusters.

Chemodynamics of Compact Stellar Systems in NGC 5128: How similar are Globular Clusters, Ultra-Compact Dwarfs, and Dwarf Galaxies?