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We analyze GALEX UV data for a system of four gravitationally-bound groups atz=0.37, SG1120, which is destined to merge into a Coma-mass cluster by z=0, tostudy how galaxy properties may change during cluster assembly. Of the 38visually-classified S0 galaxies, with masses ranging from log(M_*)~10-11, wedetect only one in the NUV channel, a strongly star-forming S0 that is thebrightest UV source with a measured redshift placing it in SG1120. Stacking theundetected S0 galaxies (which generally lie on or near the optical red-sequenceof SG1120) still results in no NUV/FUV detection (<2 sigma). Using our limit inthe NUV band, we conclude that for a rapidly truncating star formation rate,star formation ceased *at least* ~0.1 to 0.7 Gyr ago, depending on the strengthof the starburst prior to truncation. With an exponentially decliningstar-formation history over a range of time-scales, we rule out recentstar-formation over a wide range of ages. We conclude that if S0 formationinvolves significant star formation, it occurred well before the groups were inthis current pre-assembly phase. As such, it seems that S0 formation is evenmore likely to be predominantly occurring outside of the cluster environment.

A Search for Young Stars in the S0 Galaxies of a Super-Group at z=0.37