ISM Evolution in Compact Groups of Galaxies

Details ISM Evolution in Compact Groups of Galaxies ISM Evolution in Compact Groups of Galaxies

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9706j&link_type=abstract

American Astronomical Society, AAS Meeting #211, #97.06; Bulletin of the American Astronomical Society, Vol. 39, p.904

Astronomy and Astrophysics

Astronomy

Scientific paper

Compact groups of galaxies provide unique environment to study the evolution of the ISM and mechanisms by which star formation occurs amid continuous gravitational encounters. We present Spitzer, 2MASS, and HI observations of a sample of 12 Hickson Compact Groups (HCGs) that include a total of 45 galaxies. The galaxies in this sample have observed infrared characteristics that are distinctly different from the sample of galaxies in the Spitzer FLS or SINGS. Most notably, HCG galaxies exhibit a "gap" in infrared color space that is sparsely populated and which is not seen in either the FLS or SINGS. This gap may suggest a rapid evolution of galaxy properties in response to dynamical effects in HCGs. Moreover, there are striking trends seen between the ratio of HI mass to dynamical mass for an entire group and the infrared colors of the individual member galaxies. These trends suggest that the constituent galaxies in compact groups are related to the type of group in which they reside. This project provides insight into the build-up of galaxy clusters and fossil groups in the early Universe from structures like compact groups that were much more common.
This work has been supported in part by funding from the National Science Foundation, the Spitzer Space Telescope, and the Spitzer Fellowship Program.

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