Swinging on by: the tidal twists

Part of the Springer Praxis Books book series (PRAXIS)


We have seen in the previous chapter that colliding ring galaxies are the result of the direct pull of the companion galaxy’s gravity as it passes through. Most galaxy “collisions” are not literally so. That is, the galaxy disks pass closely by each other, but they do not actually collide. They can still profoundly affect each other, primarily by means of forces that are analogous to those that cause ocean tides on Earth.


Dark Matter Star Formation Spiral Wave Dwarf Galaxy Tidal Force 
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Further Reading

  1. Elmegreen, D., Galaxies and Galactic Structure, (New York, Prentice Hall), 1997.Google Scholar
  2. Schweizer, F., “Observational Evidence for Interactions and Mergers,” in Galaxies: Interactions and Induced Star Formation: Saas-Fee Advanced Course 26, eds. D. Friedli, L. Martinet, and D. Pfenniger (Springer, New York) 1998.Google Scholar
  3. Toomre, A., and Toomre, J., “Galactic Bridges and Tails,” Astrophysical Journal, Vol. 178, p. 623, 1972.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Iowa State UniversityAmesUSA

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