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ESO 148-IG002 represents a transformative stage of galaxy evolution,containing two galaxies at close separation which are currently coalescing intoa single galaxy. We present integral field data of this galaxy from the ANUWide Field Spectrograph (WiFeS). We analyse our integral field data usingoptical line ratio maps and velocity maps. We apply active galactic nucleus(AGN), star-burst and shock models to investigate the relative contributionfrom star-formation, shock excitation and AGN activity to the optical emissionin this key merger stage. We find that ESO 148-IG002 has a flat metallicitygradient, consistent with a recent gas inflow. We separate the line emissionmaps into a star forming region with low velocity dispersion that spatiallycovers the whole system as well as a southern high velocity dispersion regionwith a coherent velocity pattern which could either be rotation or anAGN-driven outflow, showing little evidence for pure star formation. We showthat the two overlapping galaxies can be separated using kinematic information,demonstrating the power of moderate spectral resolution integral fieldspectroscopy.

The energy source and dynamics of infrared luminous galaxy ESO 148-IG002