The SAURON project - X. the orbital anisotropy of elliptical and lenticular galaxies: Revisiting the (V/σ, ε) diagram with integral-field stellar kinematics

  • Cappellari M
  • Emsellem E
  • Bacon R
 et al. 
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Abstract

We analyse the orbital distribution of E and S0 galaxies using SAURON integral-field stellar kinematics. We construct the anisotropy (V/sigma,epsilon) diagram, for the 48 E/S0 galaxies from the SAURON survey. For a subsample of 24 galaxies consistent with axisymmetry, we use three-integral axisymmetric Schwarzschild dynamical models to recover the detailed orbital distribution and we find good agreement with the anisotropy derived from the (V/sigma,epsilon) diagram. In the companion Paper IX we show that the early-type galaxies can be subdivided into two classes of systems with or without a significant amount of specific stellar angular momentum. Here we show that the two classes have different distributions on the (V/sigma,epsilon) diagram. The slow rotators are more common among the most massive systems and are generally classified as E from photometry alone. Those in our sample tend to be fairly round (epsilon

Author-supplied keywords

  • Galaxies: elliptical and lenticular, cD
  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: kinematics and dynamics
  • Galaxies: structure

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Authors

  • Michele Cappellari

  • Eric Emsellem

  • R. Bacon

  • M. Bureau

  • Roger L. Davies

  • P. T. De Zeeuw

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