Radio activity in major mergings
  Cluster mergings are expected to have an influence on the radio emission of the galaxy population. We present the results of a deep radio survey in the A3558 complex in the central region of the Shapley Concentration, in order to further explore our hypothesis of a dependence of the radio luminosity function on the age of the merging. 
E.Zucca (Oss. Astronomico INAF Bologna, Italy), T.Venturi (IRA, CNR   Bologna, Italy), S.Giacintucci (Univ.Bologna, Oss. Ast...