Signatures of resonance and phase mixing in the Galactic disc

Hunt, Jason A. S.; Bub, Mathew W.; Bovy, Jo; Mackereth, J. Ted; H. Trick, Wilma; Kawata, Daisuke

doi:10.1093/mnras/stz2667

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Signatures of resonance and phase mixing in the Galactic disc

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H. Trick, Wilma
Computational Structure Formation, MPI for Astrophysics, Max Planck Society;

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Hunt, J. A. S., Bub, M. W., Bovy, J., Mackereth, J. T., H. Trick, W., & Kawata, D. (2019). Signatures of resonance and phase mixing in the Galactic disc. Monthly Notices of the Royal Astronomical Society, 490(1), 1026-1043. doi:10.1093/mnras/stz2667.

Cite as: https://hdl.handle.net/21.11116/0000-0005-5918-D

Abstract

Gaia DR2 has provided an unprecedented wealth of information about the kinematics of stars in the Solar neighbourhood, and has highlighted the degree of features in the Galactic disc. We confront the data with a range of bar and spiral models in both action-angle space, and the R_G–v_ϕ plane. We find that the phase mixing induced by transient spiral structure creates ridges and arches in the local kinematics which are consistent with the Gaia data. We are able to produce a qualitatively good match to the data when combined with a bar with a variety of pattern speeds, and show that it is non-trivial to decouple the effects of the bar and the spiral structure.