Environmental Effects on the Kinematics of Virgo Cluster

We present results from an ongoing survey dedicated to the ionized gas kinematics of Virgo cluster spiral galaxies using Fabry-Perot (FP) interferometry. Our goal is to study the environmental effects on galaxy evolution in the Virgo cluster. We report here on the Hα distribution map and velocity field of NGC 4438, the prototype of an interacting galaxy near the centre of the cluster. 1. Introduction Environmental effects play an important role on the evolution of galaxies in clusters. Different mechanisms are invoked to explain the morphology segregation observed in clusters like tidal interactions between galaxies and ram pressure stripping exerted by the intra-cluster medium on disc galaxies (see Combes 2003, van Gorkom 2003 and references therein). We are completing a survey of Virgo cluster spiral galaxies by FP observations (Chemin 2003) in order to determine the role of tidal interactions and ram-pressure stripping (ICM-ISM interactions) on their ionized gas kinematics. Observed data-cubes will be compared with the results of 3D simulations of ICM-ISM and/or tidal interactions (eg Vollmer 2003). We will also investigate the influence of the environmental effects on the dark matter distribution by comparing mass models with the results of GHASP, a FP survey of local isolated galaxies (Garrido et al. 2002).