Abstract
About 30% of all galaxies exhibit spiral forms, 60% are elliptical and 10% irregular. It is the objective of galactic dynamics to explain these structural features. A first generation of self-consistent N-body simulations indicates that ellipticals are equilibrium configurations of gravita-tionally interacting multi-particle systems for which unfortunately a theory does not yet exist. Recent progress has been made on the modal analysis of Freeman disks. In a second generation of N-body simulations spiral density waves have been reproduced in disk configurations. As an alternative to the Lin-Shu conjecture based on the QSSS-hypothesis we have considered a mechanism by which spiral density waves are produced in the surrounding disk as a consequence of the slow increase of the quadrupole moment of a central oval shaped equilibrium configruation immersed in the disk.
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Thielheim, K.O. (1982). New Developments in the Theory of Spiral Galaxies. In: Wolfendale, A.W. (eds) Progress in Cosmology. Astrophysics and Space Science Library, vol 99. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7873-7_21
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DOI: https://doi.org/10.1007/978-94-009-7873-7_21
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