Abstract
The evolution of a system of a large number of particles (N∼4×104) moving in planar trajectories in the gravitational field of the Galaxy is simulated with allowance for perturbations by a spiral density wave that give rise to spiral arms (the problem of a collisional N-body system in a specified external field). The particles simulate the motion of diffuse HI clouds in the Galaxy. The spiral-wave parameters are chosen so that the corotation region lies in the vicinity of the Sun. The spiral field pumps cloud out of the corotation region, creating a trough or gap in the initially monotonic radial distribution of particles near the corotation circle. At the same time, the arms proper exhibit no conspicuous features near corotation. This trough could explain the gap in the Galactic HI distribution observed near the solar circle and can be used to locate the corotation region if combined with other data.
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