Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733507w&link_type=abstract
American Astronomical Society, AAS Meeting #217, #335.07; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Compact groups, with their high number densities, small velocity dispersions, and the presence of neutral gas, provide a local analog to the early universe. The frequent and prolonged gravitational encounters which occur in compact groups affect the evolution of the constituent galaxies in miriad ways. Recent discovery of a gap in mid-infrared (MIR) IRAC (3.5-8 micron) colorspace and an analogous gap in their specific star formation rates are an interesting new example of how compact groups affect their member galaxies. In order to investigate the origin and nature of this gap, we have determined the IRAC colors of an expanded sample of 35 compact groups in addition to the original 12 studied by Johnson et al. (2007). We find that the gap in IRAC colorspace is still present in the larger sample. There are more galaxies which fall in the gap region, but there is still a dearth relative to the number of galaxies with both MIR bluer and MIR redder colors. This larger sample will allow us to investigate properties of galaxies throughout IRAC colorspace, most notably it will allow us to determine properties of galaxies which fall in the gap.
Charlton Jane C.
Gallagher Sarah C.
Hibbard John Eugene
Hornschemeier Ann Elizabeth
Johnson Kelsey E.
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