Central rotation curves of spiral galaxies

We present high-resolution central-to-outer rotation curves for Sb, SBb, Sc , and SBc galaxies. We discuss their general characteristics, particularly their central behavior, as well as dependencies on morphological types, act ivity, and peculiarity. The rotation curves generally show a steep nuclear rise and high-velocity central rotation, followed by a broad maximum in the disk and then a flat rotation due to the massive halo. Since the central h igh velocity and steep rise are common to all massive galaxies, they cannot be due to noncircular motions. Disk rotation curves of barred galaxies sho w larger dispersion than those of normal galaxies, probably because of nonc ircular motions. Interacting galaxies often show perturbed outer rotation c urves, while their central rotation shows no particular peculiarity. In add ition, central activities, such as starbursts and active galactic nuclei, a ppear to show no particular correlation with the property of rotation curve s. This would suggest that the central activities are triggered by a more l ocal effect: than the global dynamical property.