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arxiv 1710.11360 v1 pith:2FRDILM5 submitted 2017-10-31 astro-ph.GA

Orbital tori for non-axisymmetric galaxies

classification astro-ph.GA
keywords non-axisymmetrictoriorbitsorbitaltrappedusedaxisymmetriccompute
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Our Galaxy's bar makes the Galaxy's potential distinctly non-axisymmetric. All orbits are affected by non-axisymmetry, and significant numbers are qualitatively changed by being trapped at a resonance with the bar. Orbital tori are used to compute these effects. Thick-disc orbits are no less likely to be trapped by corotation or a Lindblad resonance than thin-disc orbits. Perturbation theory is used to create non-axisymmetric orbital tori from standard axisymmetric tori, and both trapped and untrapped orbits are recovered to surprising accuracy. Code is added to the TorusModeller library that makes it as easy to manipulate non-axisymmetric tori as axisymmetric ones. The augmented TorusModeller is used to compute the velocity structure of the solar neighbourhood for bars of different pattern speeds and a simple action-based distribution function. The technique developed here can be applied to any non-axisymmetric potential that is stationary in a rotating from - hence also to classical spiral structure.

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Forward citations

Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. GalPort: Investigation of the bar in action-angle space

    astro-ph.GA 2026-07 conditional novelty 6.0

    GalPort computes multi-timescale action-angle variables and orbital classifications for evolving barred galaxy simulations, with specialised bar phase-space analysis tools.

  2. Wrinkles in Time. II. Stellar Age Trends in Kinematic Signatures from Transient Spiral Structure

    astro-ph.GA 2026-06 unverdicted novelty 5.0

    Simulations show Lindblad-resonance wrinkles from non-winding spirals are filled with zero-age stars on orbits normally occupied by much older populations, offering an age-based constraint on past transient spiral patterns.