Compact Symmetric Objects and Supermassive Binary Black Holes in the
  VLBA Imaging and Polarimetry Survey
  We present multi-frequency Very Long Baseline Array (VLBA) follow-up
observations of VLBA Imaging and Polarimetry Survey sources identified as
likely compact symmetric objects (CSOs) or super-massive binary black holes
(SBBHs). We also present new spectroscopic redshifts for 11 sources observed
with the Hobby-Eberly Telescope. While no new SBBHs can be confirmed from these
observations, we have identified 24 CSOs in the sample, 15 of which are newly
designated, and refuted 52 candidates leaving 33 unconfirmed candidates. This
is the first large uniform sample of CSOs which can be used to elicit some of
the general properties of these sources, including morphological evolution and
environmental interaction. We have detected polarised emission from two of
these CSOs the properties of which are consistent with Active Galactic Nuclei
unification schemes.
