Hickson Compact Groups with Swift and Spitzer

Details Hickson Compact Groups with Swift and Spitzer Hickson Compact Groups with Swift and Spitzer

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..424..316t&link_type=abstract

Proceedings of the 9th International Conference of the Hellenic Astronomical Society, proceedings of a conference held 20-24 Sep

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Scientific paper

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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