Vertical motions in the disk of NGC 5668 as seen with optical Fabry-Perot spectroscopy

We have observed the nearly face-on spiral galaxy NGC 5668 with the TAURUS LI Fabry-Perot interferometer at the William Herschel Telescope using the H er line to study the kinematics of the ionized gas. From the extracted data cube we construct intensity, velocity and velocity dispersion maps. We cal culate the rotation curve in the innermost 2 arcmin and we use the residual velocity field to look for regions with important vertical motions. By com paring the geometry of these regions in the residual velocity field with th e geometry in the intensity and velocity dispersion maps we are able to sel ect some regions which are very Likely to be shells or chimneys in the disk . The geometry and size of these regions are very similar to the shells or chimneys detected in other galaxies by different means. Moreover, it is wor th noting than this galaxy has been reported to have a population of neutra l hydrogen high velocity clouds (Schulman et al. 1996) which, according to these observations, could have been originated by chimneys similar to those reported in this paper.