Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733504b&link_type=abstract
American Astronomical Society, AAS Meeting #217, #335.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Compact Groups of galaxies have low velocity dispersions and high number densities, similar to the environment of the earlier universe. Recent work on a core sample of twelve compact groups has led to the discovery of a gap in mid-infrared IRAC (3.5-8 micron) colorspace (Johnson et al. 2007) as well as specific star formation rates (Tzanavaris et al. 2010). To follow up this research we investigate the optical color-magnitude diagram (CMD) for a comprehensive sample of compact groups. We compare the distribution in the optical CMD with the IRAC colorspace distribution to see whether the IRAC gap corresponds to the optical green valley. A galaxy's location in IRAC colorspace indicates the galaxy's level of activity, thus combining optical and mid-infrared data gives us an unobscured view of what is transpiring in the galaxy. In order to gain insight into the evolution of galaxies both inside and outside of the compact group environment, we also compare the optical CMD of compact group galaxies to those from the Sloan survey. This comparison indicates that compact group galaxies occupy the optical CMD differently than field galaxies in general.
Butterfield Natalie
Johnson Kaj
Walker Linda
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