X-ray and radio interactions in galaxy groups and clusters
This work uses X-ray and radio data to examine the interaction between radio-loud AGN
and their environments. The first half of this work concentrates on how a cluster environment
influences the morphology of wide-angle tailed radio sources (WATs). It is found that existing
models of WAT formation are unable to explain the phenomenon in light of the data. It is
argued that the cluster environment is responsible for determining the location of the plume
base, and that conditions inside the plume determine the jet flaring. WATs with very bent jets
are discussed in light of jet speeds inferred from a homogenous sample of WATs, and it appears
that highly disturbed cluster environments are required for such bending. The second half of
this thesis concentrates on whether radio sources can prevent catastrophic cooling. It is found
that whilst there are some differences between groups with radio loud brightest galaxies and
those without, it is unlikely that radio sources irreversibly raise the entropy in g,TOUp centres.
Rather, it appears that current radio sources act to prevent catastrophic cooling in the centres
of groups, whilst repeated outbursts may have a longer lasting effect, particularly if the physical
size of the outburst is large.