Kinematic asymmetries in dark matter dominated galaxies

We are completing a Fabry-Pérot interferometry survey of the ionized gas in low mass surface density galaxies in order to measure the asymmetric and non-circular gas motions in their velocity fields. The goal of this work is to investigate whether the importance of such motions can impact the mass distribution and the structure of dark matter haloes of low mass disks. We describe here preliminary results of the analysis, reporting motions significantly larger than in previous works.