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Published online by Cambridge University Press: 03 August 2017
Several different gas dynamical phenomena in barred galaxies are examined with new high resolution CO observations from the OVRO millimeterwave interferometer. In M101, a gas bar is discovered which is offset in position angle by 24° from a weak stellar bar. In M83, the morphology and kinematics of a large molecular gas complex in a bar-spiral arm transition region suggest that it is formed by the combined action of orbit crowding and shocks. CO maps of 2 barred galaxies with nuclear Hα rings show bright CO emission near the ends of the rings, where shockfronts intersect the rings.