Paper:	Hickson Compact Groups with Swift and Spitzer
Volume:	424, Proceedings of the 9th International Conference of the Hellenic Astronomical Society
Page:	316
Authors:	Tzanavaris, P.; Hornschemeier, A. E.; Gallagher, S. C.; Johnson, K. E.; Gronwall, C.; Immler, S.; Reines, A. E.; Hoversten, E.; Charlton, J. C.
Abstract:	Using Swift/UVOT and Spitzer/MIPS, we estimate ∼2000 Å and 24 μm flux densities for 41 bright galaxies in 11 Hickson Compact Groups (HCGs). We use these to probe the unobscured and dust-obscured components of star-formation and calculate total star-formation rates (SFRs). We further normalize by stellar mass to obtain specific star formation rates (SSFRs) that show a clear bimodal distribution, which is absent in a luminosity-matched sample from the Spitzer IR Nearby Galaxy Survey. Other parameters related to star-formation also show such gaps for this HCG sample, and we interpret these as indications for accelerated star-formation and rapid transition to quiescence due to the high-density environments in HCGs.

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