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We present a multi-wavelength analysis of three compact galaxy groups, HCGs16, 22, and 42, which describe a sequence in terms of gas richness, from space-(Swift, HST, Spitzer) and ground-based (LCO, CTIO) imaging and spectroscopy. Westudy various signs of past interactions including a faint, dusty tidal featureabout HCG 16A, which we tentatively age-date at <1 Gyr. This represents thepossible detection of a tidal feature at the end of its phase of opticalobservability. Our HST images also resolve what were thought to be doublenuclei in HCG 16C and D into multiple, distinct sources, likely to be starclusters. Beyond our phenomenological treatment, we focus primarily oncontrasting the stellar populations across these three groups. The starclusters show a remarkable intermediate-age population in HCG 22, and identifythe time at which star formation was quenched in HCG 42. We also search fordwarf galaxies at accordant redshifts. The inclusion of 33 members and 27'associates' (possible members) radically changes group dynamical masses, whichin turn may affect previous evolutionary classifications. The extendedmembership paints a picture of relative isolation in HCGs 16 and 22, but showsHCG 42 to be part of a larger structure, following a dichotomy expected fromrecent studies. We conclude that (a) star cluster populations provide anexcellent metric of evolutionary state, as they can age-date the past epochs ofstar formation; and (b) the extended dwarf galaxy population must be consideredin assessing the dynamical state of a compact group.

Stellar Populations in Compact Galaxy Groups: a Multi-Wavelength Study of HCGs 16, 22, and 42, their Star Clusters and Dwarf Galaxies