The Role of Groups in the Evolution of Galaxies at Intermediate Redshifts

Details The Role of Groups in the Evolution of Galaxies at Intermediate Redshifts The Role of Groups in the Evolution of Galaxies at Intermediate Redshifts

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9895m&link_type=abstract

HST Proposal ID #9895

Computer Science

Hst Proposal Id #9895 Galaxies

Scientific paper

Groups are the most common environment experienced by galaxies, yet they remain the least studied. The tidal fields and dynamical friction encountered by galaxies in groups probably holds the key to understanding the role of environment in driving the evolution of galaxies since z ~ 1. To study the evolution of galaxies in the group environment, we propose the first unbiased HST study of groups at moderate redshifts. Unlike previous HST group samples, that relied on radio or X-ray properties, our kinematically selected sample is drawn from a large redshift survey and is not biased towards unusually dense groups. HST imaging is essential to determine the morphology of galaxies in these systems and contrast this with the properties of galaxies in denser and more evolved groups and rich clusters at these epochs. HST data are also required to adequately compare the properties of groups at intermediate redshifts with local group samples derived from the 2df and Sloan surveys. We will combine the HST images with deep ground-based observations to study how morphologies and stellar populations of galaxies in groups have evolved in time. These observations are key to understanding the decline in the volume averaged star formation rate in the universe.

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