The pattern speeds of vertical breathing waves

Abstract

We measure and compare the pattern speeds of vertical breathing, vertical bending, and spiral density waves in two isolated N-body+SPH simulations, using windowed Fourier transforms over 1 Gyr time intervals. We show that the pattern speeds of the breathing waves match those of the spirals but are different from those of the bending waves. We also observe matching pattern speeds between the bar and breathing waves. Our results not only strengthen the case that, throughout the disc, breathing motions are driven by spirals but indeed that the breathing motions are part and parcel of the spirals.

arXiv comment5 pages, 4 figures, published in MNRAS Letters

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• Growing Local arm inferred by the breathing motion
• Quantifying the influence of bars on action-based dynamical modelling of disc galaxies
• Quadrupole signature as a kinematic diagnostic to constrain bar properties : implications for the Milky Way
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