The following people are in this group:
A number of group members are involved in the study of active galactic nuclei (AGN), particularly, using radio, infra-red, optical, and X-ray techniques ( , , , Bliss, Mannering). Interests include the environments and dynamics of radio sources, unified models for both high-power and low-power objects, observation and modelling of jets and the X-ray/radio relationship in radio galaxies and quasars. Instruments used by the group include the , the , , the , , , the , , , and .
Active galaxies can also be used as cosmological probes. Powerful radio sources are markers of massive structures (clusters of galaxies); bywe can find massive structures in the early universe, which allows us to test models of structure formation, a key goal of cosmology. Once these structures are found, multi-waveband observations are being used to determine key parameters such as mass, dynamical state and baryon content. Radio observations (e.g. of the Sunyaev-Zel'dovich effect), optical (peculiar velocities, weak lensing) and X-ray observations (measurement of the hot intracluster plasma properties) all contribute to these studies. ( , , , ).