Sensitive Radio and Optical Observations of z~0.2 Rich Abell Clusters

Details Sensitive Radio and Optical Observations of z~0.2 Rich Abell Clusters Sensitive Radio and Optical Observations of z~0.2 Rich Abell Clusters

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....126..119r&link_type=abstract

The Astronomical Journal, Volume 126, Issue 1, pp. 119-142.

Astronomy and Astrophysics

Astronomy

11

Galaxies: Active, Galaxies: Clusters: General, Galaxies: Starburst, Radio Continuum

Scientific paper

We present optical observations and radio continuum imaging data for a sample of rich, X-ray-bright Abell clusters at intermediate (z~0.2) redshifts. We find that the radio galaxy population varies substantially from cluster to cluster within this homogeneous sample. The spatial distribution of the high-luminosity radio galaxies (HLRGs; L1.4>1023 W Hz-1) is very different from the low-luminosity radio galaxies (LLRGs; L1.4<=1022.75 W Hz-1), with the LLRGs displaying a flat spatial distribution in contrast to the centrally peaked HLRGs. A color-morphology classification shows that the HLRGs are composed primarily of galaxies with old stellar populations, whereas the LLRGs have a much more diverse composition. We do not see a correlation between the cluster radio fraction and cluster blue fraction. However, there is a moderate anticorrelation with richness, suggesting that a rich cluster is less likely to have radio-bright galaxies, whether the radio emission is due to active galactic nuclei or star formation.

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