Angle-action estimation in a general axisymmetric potential

Abstract

The usefulness of angle-action variables in galaxy dynamics is well known, but their use is limited due to the difficulty of their calculation in realistic galaxy potentials. Here we present a method for estimating angle-action variables in a realistic Milky Way axisymmetric potential by locally fitting a Stäckel potential over the region an orbit probes. The quality of the method is assessed by comparison with other known methods for estimating angle-action variables of a range of disc and halo-type orbits. We conclude by projecting the Geneva-Copenhagen survey into angle-action space.

13 pages, 12 figures, accepted for publication in MNRAS

References in corpus (3)

• The Radial Velocity Experiment (RAVE): second data release
• The mechanics of tidal streams
• Disassembling the Galaxy with angle-action coordinates

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