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VOLUME 26 (1977) | ISSUE 3 | PAGE 129
Helical density waves in flat galaxies-moving solitons
It is shown that solitons of two types, supersonic and subsonic, can propagate in a rotating gravitating disk. The supersonic solitons are capable of propagating only in the case of a weak Jeans instability of the disk. The subsonic solitons can propagate only in a stable (as defined by Jeans) disk.