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Formation and maintenance of spiral structure in galaxies

Published online by Cambridge University Press:  04 August 2017

C. C. Lin
Affiliation:
Massachusetts Institute of Technology Cambridge, MA. USA
G. Bertin
Affiliation:
Massachusetts Institute of Technology Cambridge, MA. USA

Abstract

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The formation and maintenance of spiral structure in galaxies is discussed in terms of spiral modes with a general perception consistent with the hypothesis of quasi-stationary spiral structure. The latter is explained in some detail to give it the original proper perspective and to contrast it with recent studies of non-stationary spiral structures. We again emphasize the possible coexistence of fast-evolving spiral features and slow-evolving spiral grand designs. Spiral modes are described in terms of three categories of propagating waves. The reason is given why isolated non-barred galaxies with spiral grand design are found to be mostly two-armed. Some suggestions are made for future research.

Type
PART III: Dynamics and Evolution
Copyright
Copyright © Reidel 1985 

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