Intracluster Supernova as a Possible Extra Energy Source of Clusters
  The observed luminosity -- temperature relation of clusters is considerably steeper than that expected from a simple scaling relation. Although extra energy input is a likely solution, its source has not been identified. We propose intracluster supernova as a possible source, and also predict the supernova rate in intracluster space as a critical test. 
Shin Sasaki (TMU)