ANGULAR-MOMENTUM TRANSPORT IN THE CENTRAL REGION OF THE GALAXY

We discuss mechanisms for angular momentum transport in the clumpy med ium of the circumnuclear disk at the Galactic center. The viscosity du e to clump-clump collisions is found to be less than some critical vis cosity; this meets the conditions at which a collective mode of nonaxi symmetric shear perturbations in the disk is able to grow until going into the saturation regime where fully developed turbulence is establi shed. We find that the angular momentum transfer-due to this turbulent viscosity turns out to comparable to the transport due to magnetic to rques. Taken together, the turbulent and magnetic transfer of angular momentum are able to provide the inflow of mass into the central parse c with a rate of about 10(-2) M-., yr(-1) consistent with the availabl e data.