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.

5 pages, 4 figures, published in MNRAS Letters

References in corpus (6)

• Bending and Breathing Modes of the Galactic Disk
• Radial and vertical flows induced by galactic spiral arms: likely contributors to our "wobbly Galaxy''
• The Vertical Structure and Kinematics of Grand Design Spirals
• The vertical effects of disc non-axisymmetries from perturbation theory: the case of the Galactic bar
• Excitation of vertical breathing motion in disc galaxies by tidally-induced spirals in fly-by interactions
• Bending waves excited by irregular gas inflow along warps