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We present, for the first time, direct evidence that, in a merger of diskgalaxies, the preexisting central metallicities will mix as a result of gasbeing transported in the merger interface region, along the line that joins thetwo coalescing nuclei. This is shown using detailed 2D kinematics as well asmetallicity measurements for the nearby ongoing merger in the center of thecompact group HCG 31. We focus on the emission line gas, which is extensive inthe system. The two coalescing cores display similar oxygen abundances while inbetween the two nuclei the metallicity changes smoothly from one nucleus to theother, indicating a mix of metals in this region, which is confirmed by thehigh resolution H$\alpha$ kinematics (R=45900). This nearby system isespecially important because it involves the merging of two fairly low mass andclumpy galaxies (LMC-like galaxies), making it an important system forcomparison with high redshift galaxies.

Witnessing gas mixing in the metal distribution of the Hickson Compact Group HCG 31