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Astron. Astrophys. 358, 812-818 (2000)

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

J. Jiménez-Vicente 1,2 and E. Battaner 2

1 Kapteyn Institute, Postbus 800, 9700 AV Groningen, The Netherlands
2 Universidad de Granada, Departamento de Física Teórica y del Cosmos, 18071 Granada, Spain

Received 21 October 1999 / Accepted 13 April 2000


We have observed the nearly face-on spiral galaxy NGC 5668 with the TAURUS II Fabry-Perot interferometer at the William Herschel Telescope using the [FORMULA] line to study the kinematics of the ionized gas. From the extracted data cube we construct intensity, velocity and velocity dispersion maps. We calculate the rotation curve in the innermost 2 arcmin and we use the residual velocity field to look for regions with important vertical motions. By comparing the geometry of these regions in the residual velocity field with the geometry in the intensity and velocity dispersion maps we are able to select 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 worth noting than this galaxy has been reported to have a population of neutral 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.

Key words: ISM: kinematics and dynamics – galaxies: individual: NGC 5668 – galaxies: ISM – galaxies: kinematics and dynamics – galaxies: spiral

* Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias

Send offprint requests to: J. Jiménez-Vicente

Correspondence to: jjimenez@astro.rug.nl

© European Southern Observatory (ESO) 2000

Online publication: June 20, 2000