Five Supernova Survey Galaxies in the Southern Hemisphere: Supernova Ia
  Rates
  Based on the database of 56 supernovae (SNe) events discovered in 3838
galaxies of the southern hemisphere, we compute the rate of SNe of different
types along the Hubble sequence normalized to the optical and near-infrared
(NIR) luminosities as well as to the stellar mass of the galaxies. We find that
the rates of Type Ia SNe show a dependence on both morphology and colors of the
galaxies, and therefore, on the star-formation activity. The rate of SNe Ia can
be explained by assuming that at least 15% of Ia events in spiral galaxies
originate in relatively young stellar populations. We also find that the rates
show no modulation with nuclear activity or environment.
