Non-circular flows in HIghMass galaxies in a test of the late accretion
  hypothesis
  We present H-alpha velocity maps for the HIghMass galaxies UGC 7899, UGC
8475, UGC 9037 and UGC 9334, obtained with the SITELLE Imaging Fourier
Transform Spectrometer on the Canada-France-Hawaii Telescope, to search for
kinematic signatures of late gas accretion to explain their large atomic gas
reservoirs. The maps for UGC 7899, UGC 9037, and UGC 9334 are amenable to disk
wide radial flow searches with the DiskFit algorithm, and those for UGC 7899
and UGC 9037 are also amenable to inner-disk kinematic analyses. We find no
evidence for outer disk radial flows down to Vr ~ 20 km/s in UGC 9037 and UGC
9334, but hints of such flows in UGC 7899. Conversely, we find clear signatures
of inner (r ~ 5 kpc) noncircularities in UGC 7899 and UGC 9037 that can be
modelled as either bisymmetric (which could be produced by a bar) or radial
flows. Comparing these models to the structure implied by photometric
disk-bulge-bar decompositions, we favour inner radial flows in UGC 7899 and an
inner bar in UGC 9037. With hints of outer disk radial flows and an outer disk
warp, UGC 7899 is the best candidate for late accretion among the galaxies
examined, but additional modelling is required to disentangle potential
degeneracies between these signatures in H I and H-alpha velocity maps. Our
search provides only weak = constraints on hot-mode accretion models that could
explain the unusually high H I content of HIghMass galaxies.
