Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21813002f&link_type=abstract
American Astronomical Society, AAS Meeting #218, #130.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
This study examines the star formation rates within a sample of groups selected from the Cosmic Evolution Survey (COSMOS), a 2 deg2 multi-wavelength imaging and spectroscopic survey from x-ray to radio wavelengths. Of the roughly 1,000,000 objects within the COSMOS survey, 20,000 currently have secure spectroscopic redshifts. The sample of galaxy groups is selected from x-ray data and has been spectroscopically confirmed. The sample encompasses more than 100 galaxy groups with a mass range of 1013 - 1015 solar masses and a redshift range of 0.1 ≥ z ≥ 1. Stellar mass fraction has previously been found to be anti-correlated with total mass, with clusters having lower stellar mass fractions than groups, while gas mass has been found to be positively correlated with total system mass. I investigate if star formation is a process that could significantly account for these and other observed properties of galaxy groups and the intra-group medium. Assuming representative initial-mass functions, I measure the total and specific star formation rates in the group galaxies. These results can be further applied to determine if the feedback from star formation can account for the observed baryon deficit observed within intra-group media, perhaps by blowing the baryonic interstellar gas out of the groups.
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