Optical Emission Line Nebulae in Galaxy Cluster Cores 1: The
  Morphological, Kinematic and Spectral Properties of the Sample
  We present an Integral Field Unit survey of 73 galaxy clusters and groups
with the VIsible Multi Object Spectrograph (VIMOS) on VLT. We exploit the data
to determine the H$\alpha$ gas dynamics on kpc-scales to study the feedback
processes occurring within the dense cluster cores. We determine the kinematic
state 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 the
kinematics of rotating discs and are decoupled from the stellar kinematics of
the Brightest Cluster Galaxy. The majority of the H$\alpha$ flux ($>$ 50%) is
typically associated with these ordered kinematics and most systems show
relatively simple morphologies suggesting they have not been disturbed by a
recent merger or interaction. Approximately 20% of the sample (13/73) have
disturbed morphologies which can typically be attributed to AGN activity
disrupting the gas. Only one system shows any evidence of an interaction with
another cluster member. A spectral analysis of the gas suggests that the
ionisation of the gas within cluster cores is dominated by non stellar
processes, possibly originating from the intracluster medium itself.
