The Parsec-Scale Morphology of Southern GPS sources
  Multi-frequency, multi-epoch ATCA observations of a sample of AGN resulted in
the identification of 9 new candidate Giga-hertz Peaked Spectrum (GPS) sources.
Here we present Long Baseline Array observations at 4.8 GHz of the four
candidates with no previously published VLBI image, and consider these together
with previously published VLBI images of the other five sources. We find
core-jet or compact double morphologies dominate, with further observations
required to distinguish between these two possibilities for some sources. One
of the nine candidates, PKS 1831-711, displays appreciable variability,
suggesting its GPS spectrum is more ephemeral in nature. We focus in particular
on the apparent relationship between a narrow spectral width and "compact
double" parsec-scale morphology, finding further examples, but also exceptions
to this trend. An examination of the VLBI morphologies high-redshift (z>3)
sub-class of GPS sources suggests that core-jet morphologies predominate in
this class.
