The cluster environments of radio-loud AGN

TL;DR

This study investigates the environments of radio-loud AGN, revealing correlations between radio luminosity and cluster richness for low excitation types, and potential environmental evolution for high excitation types.

Contribution

It provides new insights into how different types of radio-loud AGN relate to their cluster environments and their evolution over cosmic time.

Findings

Low excitation radio galaxies show a strong correlation between radio luminosity and environment richness.

No evolution of environment with redshift was observed for low excitation radio galaxies.

High excitation radio galaxies show no correlation with environment richness and may evolve with redshift.

Abstract

Radio-loud AGN play an important r\^ole in galaxy evolution. We need to understand their properties, and the processes that affect their behaviour in order to model galaxy formation and development. We here present preliminary results of an investigation into the cluster environments of radio galaxies. We have found evidence of a strong correlation between radio luminosity and environment richness for low excitation radio galaxies, and no evidence of evolution of the environment with redshift. Conversely, for high excitation radio galaxies, we found no correlation with environment richness, and tentative evidence of evolution of the cluster environment.