Kinematics in 17 nearby spiral galaxies

We discuss the properties of each sample galaxy, distinguishing between those characterized by regular or peculiar kinematics. In most of the observed galaxies, ionized gas rotates more rapidly than stars and has a lower velocity dispersion, as is to be expected if the gas is confined in the disc and supported by rotation while the stars are mostly supported by dynamical pressure.

In a few objects, gas and stars show almost the same rotational velocity and low velocity dispersion, suggesting that their motion is dominated by rotation. Incorporating the spiral galaxies studied by Bertola et al. (1996ApJ...458L..67B), Corsini et al. (1999, Cat. <J/A+A/342/671>, 2003, Cat. <J/A+A/408/873>) and Vega Beltran et al. (2001, Cat. <J/A+A/374/394>) we have compiled a sample of 50 S0/a-Scd galaxies, for which the major-axis kinematics of the ionized gas and stars have been obtained with the same spatial (~1") and spectral (~50km/s) resolution, and measured with the same analysis techniques.