ON THE EFFECTS OF INCLUDING COUNTERROTATING ANGULAR-MOMENTUM IN SIMULATIONS OF GALACTIC DISK SYSTEMS

We describe the evolution of two-dimensional disk systems constructed with significant portions of their angular momentum counterrotating. W e confirm that counterrotating angular momentum stabilizes an otherwis e bar unstable disk. Further, we show that is possible to realize nove l bar/disk and bar/bar configurations by varying our initial condition s. We find that it is possible to construct models that evolve to the following configurations: two counterrotating bars, a cospatial bar an d bulgelike component, and a slow counterrotating bar. We examine the possible implications of such systems and whether they might exist in nature.