As part of the Great Observatories All-sky LIRG Survey (GOALS), we have been carrying out a multi-frequency radio survey of U/LIRGs using the Very Large Array. We have recently completed an analysis of the central radio sources in a sample of 63 systems, studying the radio properties as a function of the energy source (star formation or supermassive black hole growth). In “Characterizing Compact 15-33 GHz Radio Continuum Sources in Local U/LIRGs (Song+), we identify nuclear star forming regions that have star formation rate surface densities that are significantly higher than those seen in normal galaxies. These regions also appear to have an increased contribution of non-thermal emission resulting from supernovae. These results provide further evidence that the central star formation of local U/LIRGs proceeds under different physical conditions from the normal star formation in the bulk of the galaxy population.
The paper has been accepted for publication in The Astrophysical Journal and a preprint is available at the link above.