Structures and components in galaxy clusters: observations and models
  Clusters of galaxies are the largest gravitationally bounded structures in
the Universe dominated by dark matter. We review the observational appearance
and physical models of plasma structures in clusters of galaxies. Bubbles of
relativistic plasma which are inflated by supermassive black holes of AGNs,
cooling and heating of the gas, large scale plasma shocks, cold fronts,
non-thermal halos and relics are observed in clusters. These constituents are
reflecting both the formation history and the dynamical properties of clusters
of galaxies. We discuss X-ray spectroscopy as a tool to study the metal
enrichment in clusters and fine spectroscopy of Fe X-ray lines as a powerful
diagnostics of both the turbulent plasma motions and the energetics of the
non-thermal electron populations. The knowledge of the complex dynamical and
feedback processes is necessary to understand the energy and matter balance as
well as to constrain the role of the non-thermal components of clusters.
