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Active Galaxies

The following people are in this group:

More about this group

A number of group members are involved in the study of active galactic nuclei (AGN), particularly radio galaxies, using radio, infra-red, optical, and X-ray techniques (Worrall, Birkinshaw, Young, 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 VLA, the VLBA, MERLIN, the ATCA, BIMA, ISO, the HST, ROSAT, ASCA, XMM and Chandra.

Active galaxies can also be used as cosmological probes. Powerful radio sources are markers of massive structures (clusters of galaxies); by observing them at high redshift we 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. (Birkinshaw, Bremer, Worrall, Maughan).