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

摘要: 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. find that the galaxy population varies substantially from cluster to within this homogeneous sample. The spatial distribution high-luminosity galaxies (HLRGs; L1.4 > 1023 W Hz-1) is very different low-luminosity (LLRGs; ≤ 1022.75 Hz-1), with LLRGs displaying flat in contrast centrally peaked HLRGs. A color-morphology classification shows HLRGs are composed primarily old stellar populations, whereas have much more diverse composition. do not see correlation between fraction blue fraction. However, there moderate anticorrelation richness, suggesting rich less likely radio-bright galaxies, whether emission due active galactic nuclei or star formation.