The Bulge/Disk Connection in Late-Type Spirals

Observational Evidence for Models of Secular Evolution
  • Stéphane Courteau
Part of the Astrophysics and Space Science Library book series (ASSL, volume 209)

Abstract

Recent ground-based photometric investigations suggest that central regions of late-type spirals are closely coupled to the inner disk and probably formed via secular evolution. Evidence presented in support of this model includes the predominance of exponential bulges, the correlation of bulge and disk scale lengths, blueness of the bulge and small differences between bulge and central disk colors, detection of spiral structure into the core, and rapid rotation. Recent HST observations show that our own bulge and that of M31, M32, and M33 probably harbor both an old and intermediateage populations in agreement with models of early collapse of the spheroid plus gas transfer from the disk. Secular evolution provides a mechanism to build-up central regions in late-type spirals; mergers or accretion of small satellites could explain the brighter, kinematically distinct bulges of Sa‘s and SO‘s.

Keywords

Star Formation Spiral Galaxy Stellar Population Secular Evolution Disk Color 
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

  • Stéphane Courteau
    • 1
  1. 1.NOAO/KPNO, Kitt Peak National ObservatoryTucsonUSA

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