Distribution functions for resonantly trapped orbits in our Galaxy

We show how to capture the behaviour of the phase-space distribution function (DF) of a Galactic disc stellar population at a resonance. This is done by averaging the Hamiltonian over fast angle variables and re-expressing the DF in terms of a new set of canonical actions and angles variables valid...

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Published in:Proceedings of the International Astronomical Union 2017-07, Vol.13 (S334), p.341-342
Main Authors: Monari, G., Famaey, B., Fouvry, J.-B., Binney, J.
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Language:English
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Sciences of the Universe
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description We show how to capture the behaviour of the phase-space distribution function (DF) of a Galactic disc stellar population at a resonance. This is done by averaging the Hamiltonian over fast angle variables and re-expressing the DF in terms of a new set of canonical actions and angles variables valid in the resonant region. We then assign to the resonant DF the time average along the orbits of the axisymmetric DF expressed in the new set of actions and angles. This boils down to phase-mixing the DF in terms of the new angles, such that the DF for trapped orbits only depends on the new set of actions. This opens the way to quantitatively fitting the effects of the bar and spirals to Gaia data in terms of distribution functions in action space.
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title Distribution functions for resonantly trapped orbits in our Galaxy
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