  We show preliminary results from a sample of Luminous and Ultra-Luminous
Infrared Galaxies (LIRGs and ULIRGs, respectively) in the local universe,
obtained from observations using the Very Large Array (VLA), the Multi-Element
Radio Link Interferometer Network (MERLIN), and the European VLBI Network
(EVN). The main goal of our high-resolution, high-sensitivity radio
observations is to unveil the dominant gas heating mechanism in the central
regions of local (U)LIRGs. The main tracer of recent star-formation in (U)LIRGs
is the explosion of core-collapse supernovae (CCSNe), which are the endproducts
of the explosion of massive stars and yield bright radio events. Therefore, our
observations will not only allow us to answer the question of the dominant
heating mechanism in (U)LIRGs, but will yield also the CCSN rate and the
star-formation rate (SFR) for the galaxies of the sample.
