Optical Substructure in Clusters Containing WAT Radio Galaxies

Details Optical Substructure in Clusters Containing WAT Radio Galaxies Optical Substructure in Clusters Containing WAT Radio Galaxies

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..359p&link_type=abstract

NOAO Proposal ID #2000A-0359

Computer Science

Scientific paper

We propose wide-field imaging of 10 galaxy clusters containing Wide- angle tailed (WAT) radio galaxies in order to quantify the presence of substructure within the clusters. This is part of a campaign to illuminate the process of cluster evolution using radio galaxies. WATs have a `bent-tail' appearance which suggests a relative motion between the host galaxy and the intracluster medium (ICM). However, a redshift survey has shown that WATs have systematic velocities within their subclusters that are too small to account for the bending. Our contention is that the bending occurs because of large-scale flows in the ICM which accompany hierarchical cluster formation. We wish to combine B, V and R imaging data with existing redshift, X-ray, and radio data to better understand the dynamical state of these clusters. The colors B-R and V-R will be used to select cluster members (via the color- magnitude relation) down to the dwarf upturn of the luminosity function. This will improve the sensitivity of our substructure diagnostics by vastly increasing the number of cluster members over redshift surveys. Moreover, this will be the first examination of the spiral fractions, morphology-density relation, and isophotal truncation of radio galaxies for a complete sample of low-intermediate redshift WAT clusters.

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