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Published online by Cambridge University Press: 03 August 2017
The results from optical and radio studies of a flux limited sample of luminous infrared galaxies in the Southern Hemisphere are reported. The detailed study of the nearest (z ≤ 0.13) ultraluminous infrared galaxies (Lir ≥ 1012L1) show that these are mergers of giant gas-rich systems with critical separations of 10 kpc. Merging of gas-rich galaxies enhance molecular cloud formation, as well as the infrared luminosity per nucleon of interstellar gas.