Observations of the kinematics of barred spiral galaxies. I - NGC 1300

Abstract

The observed emission-line velocity field of the SBb galaxy NGC 1300 shows strong departures from the pattern expected for purely circular motions. A comparison of the observed data with the kinematics predicted by the Huntley barred galaxy model suggests that the underlying mass structure of the galaxy is in the form of an elongated bar whose major axis lies in the same position angle as the apparent optical bar; the deviations from circular motion are due to the response of the gaseous disk to the rotation of the stellar bar. The pattern of velocities further suggests that the actual mass distribution in the galaxy is more centrally condensed than that of the dynamically self-consistent models.