Massive Stars in Hickson Compact Groups as Tracers of the Early Universe

Details Massive Stars in Hickson Compact Groups as Tracers of the Early Universe Massive Stars in Hickson Compact Groups as Tracers of the Early Universe

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9601c&link_type=abstract

American Astronomical Society, AAS Meeting #211, #96.01; Bulletin of the American Astronomical Society, Vol. 39, p.900

Astronomy and Astrophysics

Astronomy

Scientific paper

Compact groups of galaxies have some important similarities to protogalactic groups in the early universe. They have frequent interactions, the velocities of encounters are similar, and their gas is often stripped from the galaxies. Thus the formation of massive stars in compact groups, particularly those that form outside of galaxies, and their influence on their environment could provide clues to how these processes work at high redshift. We have embarked on a multi-wavelength study of twelve Hickson compact groups.
We will summarize the results of our Spitzer study of these groups. We find that the groups that are most gas-rich have the most active star formation. About half of he giant galaxies in the groups show red, mid-infrared colors in their nuclei, characteristic of AGNs and/or star formation, and that there is more such activity in the gas-rich groups.
We also present an analysis of the star clusters populations and the extended tidal sources in the contrasting examples of HCG 7 and HCG 31. This analysis is based on our HST/ACS BVI images of these groups. HCG 31 has widespread extremely recent star formation in the debris outside of the galaxies while HCG 7 is relatively quiescent.

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