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Conference Paper

Phase-space spirals in Gaia DR 2: the role of the Milky Way bar


Khoperskov,  Sergey
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Khoperskov, S., Matteo, P. D., Gerhard, O., Katz, D., Haywood, M., Combes, F., et al. (2019). Phase-space spirals in Gaia DR 2: the role of the Milky Way bar. In 53rd ESLAB symposium (pp. 527-530). Switzerland: Zenodo, European Organization for Nuclear Research. doi:10.5281/zenodo.3237244.

Cite as: https://hdl.handle.net/21.11116/0000-0006-69E0-7
Using a single N-body simulation we explore the formation, evolution, and spatial variation of the phase-space
spirals similar to those recently discovered in the Milky Way disk. For the first time in the literature we use
a self-consistent N-body simulation of an isolated Milky Way-type galaxy to show that the phase-space spirals
develop naturally from vertical waves driven by the buckling of the stellar bar. Such vertical oscillations trigger
the formation of various time-dependent phase-space spirals in the entire disk. The underlying physical mechanism
implies the link between in-plane and vertical motion that leads directly to phase-space structures whose amplitude
and shape are in remarkable agreement with those of the phase-space spirals observed in the Milky Way disk. In
our isolated galaxy simulation, phase-space spirals are still distinguishable at the solar neighborhood 3 Gyr after
the buckling phase. The long-lived character of the phase-space spirals generated by the bar buckling instability
cast doubts on the timing argument used so far to get back to the time of the onset of the perturbation.