Hypothesis on the origin of the spiral structure of the galaxies |
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| Authors: | L S Marochnik A A Suchkov |
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| Institution: | (1) Astrophysical Institute of the Academy of Sciences of the Tadjik S.S.R., Dushanbe, USSR |
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| Abstract: | The spiral waves in a model galaxy consisting of differentially rotating and non-rotating subsystems are considered on the basis of participating phenomena. The subsystems involved represent the Populations I and II of normal spirals, respectively. The spiral waves in such a systems are unstable in the Landau sense. Due to this instability they grow up to attain finite amplitude. This growth is stopped by a non-linear effect (the quasilinear effect), the steady state with waves of finite amplitude being established. The hypothesis is proposed that these waves should be identified with the spiral structure of the galaxies. |
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