The Fate of Luminous Compact Blue Galaxies: An Environmental Approach

Details The Fate of Luminous Compact Blue Galaxies: An Environmental Approach The Fate of Luminous Compact Blue Galaxies: An Environmental Approach

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9917c&link_type=abstract

HST Proposal ID #9917

Computer Science

Hst Proposal Id #9917 Galaxies

Scientific paper

Luminous Compact Blue Galaxies {LCBGs} are the most rapidly evolving galaxy population between 0.4 < z < 1.0. Despite their small sizes of 2-3 kpc, LCBGs are powerful engines of star formation that dominate the global SFR over that redshift regime. They appear to be a link between local, low-mass HII galaxies and high-z, high-luminosity Lyman Break galaxies. As such, LCBGs may provide an important test of hierarchical structure-formation scenarios. Currently, a debate rages over what LCBGs are: Are we seeing proto-spheroidals or the formation of spiral bulges? We propose to identify a sample of LCBGs in 10 intermediate-z clusters areas from Archive WFPC2 images through photometric structural measurements {e.g., surface brightness, size, and concentration}. These galaxies cannot be resolved in ground-based images. We then will measure the relative number densities and photometric properties of LCBGs in clusters and the field. By combining this comparison with what we know about the morphology-density relationship today, we will gain new insight on the ultimate fate of LCBGs and the differences between galaxy evolution in field and cluster environments. The WFPC2 data, combined with our deep multi-color, ground-based imaging from the WIYN 3.5m telescope will provide the largest data set of intermediate-z LCBGs to date.

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