Consequences

• The localized contribution of regular orbits to the observables implies:

  • Integral Field Spectroscopy is needed to constrain the internal dynamics
  • We can understand some known facts:
    • Easy to construct self-consistent models (fit the density with the orbital components)
    • Easy to reproduce any velocity field: higher order moments are needed to constrain the internal dynamics
    • The DF has to be smooth, otherwise cusps and folds would appear in the galaxy surface brightness