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Warps, Waves, and Phase Spirals in the Milky Way

Published online by Cambridge University Press:  14 May 2020

Lawrence M. Widrow Open the ORCID record for Lawrence M. Widrow [Opens in a new window] ,
Keir Darling  and
Haochuan Li
Lawrence M. Widrow
Affiliation:
Department of Physics, Engineering Physics, and Astronomy, Queen’s University, Kingston, Ontario, Canada email: [email protected]
Keir Darling
Affiliation:
Department of Physics, Engineering Physics, and Astronomy, Queen’s University, Kingston, Ontario, Canada email: [email protected]
Haochuan Li
Affiliation:
Department of Physics, Engineering Physics, and Astronomy, Queen’s University, Kingston, Ontario, Canada email: [email protected]
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Abstract

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The stellar disc of the Milky Way exhibits clear departures from planarity, the most conspicuous manifestation being the Galactic Warp but also includes an apparent corrugation pattern in number counts around 15kpc from the Galactic centre, a wave like pattern in the vertical velocities of stars as a function of guiding radius, asymmetries about the midplane in both number counts and bulk motions, and phase spirals in the z–vz projection of the local stellar distribution function. We discuss the physics of these phenomena and, in particular, suggest a possible avenue for inferring the vertical force in the Solar Neighbourhood from phase spirals. We apply Dynamic Mode Decomposition, a technique widely used in the realm of fluid mechanics, to simulations of disc galaxy simulations. This method appears to be particularly well-suited to the study of nonlinear processes such as the coupling of warps and spirals, first discussed by Masset and Tagger.

Keywords

Galaxy: kinematics and dynamicsCosmology: dark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S353: Galactic Dynamics in the Era of Large Surveys , June 2019 , pp. 65 - 70
Copyright
© International Astronomical Union 2020

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