Journal Article

Angle–action estimation in a general axisymmetric potential

Jason Sanders

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 426, issue 1, pages 128-139
Published in print October 2012 | ISSN: 0035-8711
Published online October 2012 | e-ISSN: 1365-2966 | DOI:
Angle–action estimation in a general axisymmetric potential

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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.

Keywords: methods: numerical; Galaxy: kinematics and dynamics; solar neighbourhood; Galaxy: structure; galaxies: kinematics and dynamics

Journal Article.  9030 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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