Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 426, Issue 2, Pages 1324-1327Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2012.21757.x
Keywords
Galaxy: kinematics and dynamics; galaxies: kinematics and dynamics
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Funding
- Science and Technology Facilities Council [ST/G002479/1, ST/J00149X/1, PP/D001242/1] Funding Source: researchfish
- STFC [PP/D001242/1, ST/J00149X/1, ST/G002479/1] Funding Source: UKRI
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We give an algorithm for the economical calculation of angles and actions for stars in axisymmetric potentials. We test the algorithm by integrating orbits in a realistic model of the Galactic potential, and find that, even for orbits characteristic of thick-disc stars, the errors in the actions are typically smaller than 2 per cent. We describe a scheme for obtaining actions by interpolation on tabulated values that significantly accelerates the process of calculating observables quantities, such as density and velocity moments, from a distribution function.
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