HST Imaging of Moderate Redshift X-ray Emitting Groups of Galaxies

Details HST Imaging of Moderate Redshift X-ray Emitting Groups of Galaxies HST Imaging of Moderate Redshift X-ray Emitting Groups of Galaxies

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8131m&link_type=abstract

HST Proposal ID #8131

Mathematics

Logic

Hst Proposal Id #8131 Clusters Of Galaxies And Lensing

Scientific paper

Most galaxies in the universe, including our own Milky Way, are members of poor groups of galaxies. Recent optical and X- ray observations of nearby groups have revealed considerable new insight into these important systems. In particular, there are very strong trends between the morphologies of the member galaxies and the global group properties, such as velocity dispersion and the presence of X-ray emitting intragroup gas. To better study evolution in the group environment, we have embarked on a ground-based photometric and spectroscopic survey of a large sample of X-ray selected groups at redshifts of z=0.1-0.5. Our existing ground-based data allow us to determine group membership, derive galaxy colors, and calculate global kinematic properties. However, at these redshifts we lack the ability to quantify galaxy morphology, an essential element in understanding the evolutionary effects occurring in the group environment. Therefore, we propose to obtain WPFC2 images of a subset of our moderate redshift sample. The high angular resolution imagery of HST, combined with our ground-based observations, will allow us to determine the morphological composition of moderate redshift groups, to study how the galaxy population of groups has evolved in time, to examine the Butcher-Oemler effect in the group environment, and to search for direct evidence of mergers and/or galaxy- galaxy encounters in these systems.

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