Accretion of gaseous disks of galaxies. II. Allowance for viscosity in a disk consisting of giant molecular clouds

Abstract

The evolution of the distribution of giant molecular clouds in galaxies under the influence of dynamical friction on stars and viscosity is calculated in the approximation of a collisionless gas. It is shown that in principle the joint action of the viscosity and the dynamical friction can lead to the formation of the ring-shaped distribution of giant molecular clouds in the Galaxy with a maximum at 6-7 kpc from the center during a time of the order of a few billion years.