Corrugated Velocity Pattern in NGC 5427

Alfaro, E. J., Pérez, E., González-Delgado, R., Martos, M., and Franco, J.
in Galaxy Disks and Disk Galaxies, proceeding of a conference held in Rome, Italy, June 12-16, 2000 at the Pontifical Gregorian University and sponsored by the Vatican Observatory. ASP Conference Series, Vol. 230. Edited by José G. Funes, S. J. and Enrico Maria Corsini. San Francisco: Astronomical Society of the Pacific. ISBN: 1-58381-063-3, 2001, pp. 199-200


Here we report the detection, in Hα emission, of a radial corrugation in the velocity field of the spiral galaxy NGC 5427. The central velocity of the Hα line displays coherent, wavy-like variations in the vicinity of the spiral arms. This kinematical behavior is similar to the one expected in a galactic bore generated by the interaction of a spiral wave with a thick gaseous disk, as recently modelled by Martos & Cox (1998).