Kinematics of an anaemic cluster galaxy

We present new HI and CO data including velocity information of NGC 4548, a n anaemic galaxy in the Virgo Cluster. The distribution of the atomic gas s hows a ring-like structure. The HI rotation curve is deduced and can be ext rapolated inwards with the help of the CO data. The derived molecular fract ion decreases continuously up to a radius of about 40 " showing a rather sh arp transition between the molecular and the atomic disc. A three-dimension al visualization of the data cube permits us to detect a perturbation of th e velocity field in the northern part of the galaxy. In a first approach we reconstruct the possible sites of HI emission with the help of a simple ki nematical model in three dimensions. The reconstructed model shows a ridge which is believed to be due to ram-pressure stripping. In addition, we show first results of a dynamical model to simulate the interaction between the intra-cluster medium and the galaxy.