Bars and Lenses in Spiral Galaxies: Clues for Secular Evolution

  • Leslie K. Hunt
  • Carlo Giovanardi
  • Matthew A. Malkan
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 319)


We analyze ~200 spiral galaxies in terms of elliptical isophotes, bar profile type, and non-axisymmetric perturbation amplitudes. More than half our sample is imaged in the H band, which enables us to derive gravitational potential and relative torque Q g . We find that bar axial ratios increase significantly with decreasing Hubble type, both for exponential and flat bars; however, at a given Hubble type, exponential bars tend to have a larger axial ratio than flat ones. We have also identified four different torque morphologies, and find that one of these is prevalent in strong bars. These results are interpreted in the context of a secular evolution scenario, in which we speculate that early-type flat bars are the descendants of late-type exponential ones.


Bars spiral galaxies near-infrared 


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Copyright information

© Springer Science+Business Media New York 2004

Authors and Affiliations

  • Leslie K. Hunt
    • 1
  • Carlo Giovanardi
    • 2
  • Matthew A. Malkan
    • 3
  1. 1.Istituto di Radioastronomia/Sezione FirenzeItaly
  2. 2.INAF-Osservatorio Astrofisico di ArcetriFirenzeItaly
  3. 3.University of CaliforniaLos AngelesUSA

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