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(Abridged) Compact groups, with their high number densities, small velocitydispersions, and an interstellar medium that has not been fully processed,provide a local analog to conditions of galaxy interactions in the earlieruniverse. The frequent and prolonged gravitational encounters that occur incompact groups affect the evolution of the constituent galaxies in a myriad ofways, for example gas processing and star formation. Recently, a statisticallysignificant "gap" has been discovered mid-infrared IRAC colorspace of compactgroup galaxies. This gap is not seen in field samples and is a new example ofhow the compact group environment may affect the evolution of member galaxies.In order to investigate the origin and nature of this gap, we have compiled asample of 49 compact groups. We find that a statistically significant deficitof galaxies in this gap region of IRAC colorspace is persistant in this sample,lending support to the hypothesis that the compact group environment inhibitsmoderate SSFRs. We note a curvature in the colorspace distribution, which isfully consistent with increasing dust temperature as the activity in a galaxyincreases. This full sample of 49 compact groups allows us to subdivide thedata according to physical properties of the groups. An analysis of thesesubsamples indicates that neither projected physical diameter nor density showa trend in colorspace within the values represented by this sample. Wehypothesize that the apparent lack of a trend is due to the relatively smallrange of properties in this sample. Thus, the relative influence of stochasticeffects becomes dominant. We analyze spectral energy distributions of membergalaxies as a function of their location in colorspace and find that galaxiesin different regions of MIR colorspace contain dust with varying temperaturesand/or PAH emission.

Examining the Role of Environment in a Comprehensive Sample of Compact Groups