itle:  "Galaxy Activity in Galaxy Clusters"

Abstract: Understanding how galaxy properties are affected by the
environment is still a challenge for modern astrophysics. Galaxy
Clusters provide a special environment for galaxies because they contain
galaxies, hot gas and dark matter that affect galaxy properties
gravitationally and hydrodynamically over several billion years.
Therefore, galaxy clusters, the largest gravitationally bound systems in
the universe, are excellent giant laboratories for studying galaxy
formation and evolution. I will discuss the effect of cluster-cluster
merging on galaxy activity, and describe an infrared view of these clusters.