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We present deep HST ACS images of the post-starburt shell galaxy AM 0139-655.We find evidence for the presence of three distinct globular clustersubpopulations associated with this galaxy: a centrally concentrated youngpopulation (~ 0.4 Gyr), an intermediate age population (~ 1 Gyr) and an old,metal-poor population similar to that seen around normal galaxies. The g-Icolor distribution of the clusters is bimodal with peaks at 0.85 and 1.35. Theredder peak at g-I=1.35 is consistent with the predicted color for an oldmetal-poor population. The clusters associated with the peak at g-I=0.85 arecentrally concentrated and interpreted as a younger and more metal-richpopulation. We suggest that these clusters have an age of ~ 0.4 Gyr and solarmetallicity based on a comparison with population synthesis models. Theluminosity function of these "blue" clusters is well represented by a powerlaw. Interestingly, the brightest shell associated with the galaxy harbors someof the youngest clusters observed. This seems to indicate that the same mergerevent was responsible for the formation of both the shells and the youngclusters. The red part of the color distribution contains several very brightclusters, which are not expected for an old, metal-poor population.Furthermore, the luminosity function of the "red" GCs cannot be fit well byeither a single gaussian or a single power law. A composite (gaussian + powerlaw) fit to the LF of the red clusters yields both a low rms and very plausibleproperties for an old population plus an intermediate-age population of GCs.Hence, we suggest that the red clusters in AM 0139-655 consist of two distinctGC subpopulations, one being an old, metal-poor population as seen in normalgalaxies and one having formed during a recent dissipative galaxy merger.

Evidence for Three Subpopulations of Globular Clusters in the Early-Type Post-Starburst Shell Galaxy AM 0139-655