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Secular Evolution of Galaxy Morphologies

  • D. Pfenninger
  • L. Martinet
  • F. Combes
Part of the Astrophysics and Space Science Library book series (ASSL, volume 209)

Abstract

Today we have numerous evidences that spirals evolve dynamically through various secular or episodic processes, such as bar formation and destruction, bulge growth and mergers, sometimes over much shorter periods than the standard galaxy age of 10 – 15 Gyr. This, coupled to the known properties of the Hubble sequence, leads to a unique sense of evolution: from Sm to Sa. Linking this to the known mass components provides new indications on the nature of dark matter in galaxies. The existence of large amounts of yet undetected dark gas appears as the most natural option. Bounds on the amount of dark stars can be given since their formation is mostly irreversible and requires obviously a same amount of gas.

Keywords

Dark Matter Star Formation Disc Galaxy Stellar Disk Secular Evolution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • D. Pfenninger
    • 1
  • L. Martinet
    • 1
  • F. Combes
    • 2
  1. 1.Geneva ObservatoryUniversity of GenevaSauvernySwitzerland
  2. 2.DEMIRM, Observatoire de ParisParisFrance

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