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We present an Integral Field Unit survey of 73 galaxy clusters and groupswith the VIsible Multi Object Spectrograph (VIMOS) on VLT. We exploit the datato determine the H$\alpha$ gas dynamics on kpc-scales to study the feedbackprocesses occurring within the dense cluster cores. We determine the kinematicstate of the ionised gas and show that the majority of systems ($\sim$ 2/3)have relatively ordered velocity fields on kpc scales that are similar to thekinematics of rotating discs and are decoupled from the stellar kinematics ofthe Brightest Cluster Galaxy. The majority of the H$\alpha$ flux ($>$ 50%) istypically associated with these ordered kinematics and most systems showrelatively simple morphologies suggesting they have not been disturbed by arecent merger or interaction. Approximately 20% of the sample (13/73) havedisturbed morphologies which can typically be attributed to AGN activitydisrupting the gas. Only one system shows any evidence of an interaction withanother cluster member. A spectral analysis of the gas suggests that theionisation of the gas within cluster cores is dominated by non stellarprocesses, possibly originating from the intracluster medium itself.

Optical Emission Line Nebulae in Galaxy Cluster Cores 1: The Morphological, Kinematic and Spectral Properties of the Sample