Kinematic alignment of non-interacting CALIFA galaxies: Quantifying the
  impact of bars on stellar and ionised gas velocity field orientations
  We present 80 stellar and ionised gas velocity maps from the Calar Alto
Legacy Integral Field Area (CALIFA) survey in order to characterize the
kinematic orientation of non-interacting galaxies. The study of galaxies in
isolation is a key step towards understanding how fast-external processes, such
as major mergers, affect kinematic properties in galaxies. We derived the
global and individual (projected approaching and receding sides) kinematic
position angles (PAs) for both the stellar and ionised gas line-of-sight
velocity distributions. When compared to the photometric PA, we find that
morpho-kinematic differences are smaller than 22 degrees in 90% of the sample
for both components; internal kinematic misalignments are generally smaller
than 16 degrees. We find a tight relation between the global stellar and
ionised gas kinematic PA consistent with circular-flow pattern motions in both
components. This relation also holds generally in barred galaxies across the
bar and galaxy disk scales. Our findings suggest that even in the presence of
strong bars, both the stellar and the gaseous components tend to follow the
gravitational potential of the disk. As a result, kinematic orientation can be
used to assess the degree of external distortions in interacting galaxies.
