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Various ring structures observed in galaxies are considered. Formation and evolution of the rings are interesting problems in studies of the galactic morphology that is related to fundamental aspects of galactic evolution and dynamics: the nature and distribution of the dark matter, galactic interactions and internal secular evolution of the galaxies. A significant fraction of galactic rings forms...
We report the detection of giant cyclonic vortices in the gaseous disc of the spiral galaxy NGC 3631 in the reference frame rotating with the spiral pattern. A presence of such structures was predicted by the authors for galaxies, where the radial gradient of the perturbed velocity exceeds that of the rotational velocity. This situation really takes place in NGC 3631.
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