Abstract
One of the most exciting results of the IRAS sky survey was the discovery of luminous infrared galaxies, which emit the bulk of their radiataion in the infrared. One of the most vexing questions about luminous infrared galaxies is the relative contribution of starburst or AGN to the overall energy budget. We are addressing this issue by combining theoretical modelling with optical, radio and infrared data from IRAS for a large sample of 285 infrared galaxies of a range of luminosities. We present an optical diagnostic analysis of a nearby subsample and analyse the incidence of compact radio cores. We find 90% of AGN type galaxies contain compact radio cores, while 37% of starburst galaxies contain compact radio cores. The compact radio cores may be obscured AGN or compact supernove activity such as that seen in Arp 220.
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