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We study stellar and black hole mass assembly in a sample of 42infrared-luminous galaxy mergers at z<0.3 by combining results from radiativetransfer modelling with archival measures of molecular gas and black hole mass.The ratios of stellar mass, molecular gas mass, and black hole mass to eachother are consistent with those of massive gas-rich galaxies at z<0.3. Theadvanced mergers may show increased black hole mass to stellar mass ratios,consistent with the transition from AGN to ellipticals and implying substantialblack hole mass growth over the course of the merger. Star formation rates areenhanced relative to the local main sequence, by factors of ~100 in thestarburst and ~1.8 in the host. The starburst star formation rates appeardistinct to star formation in the main sequence at all redshifts up to at leastz~5. Starbursts may prefer late-stage mergers, but are observed at any mergerstage. We do not find evidence that the starbursts in these low-redshiftsystems substantially increase the total stellar mass, with a soft upper limiton the stellar mass increase from starburst activity of about a factor of two.In contrast, 12 objects show evidence for super-Eddington accretion, associatedwith late-stage mergers, suggesting that many AGN in infrared-luminous mergersgo through a super-Eddington phase. The super-Eddington phase may increaseblack hole mass by up to an order of magnitude at an accretion efficiency of42+/-33% over a period of 44+/-22Myr. Our results imply that super-Eddingtonaccretion is an important black hole growth channel in infrared-luminousgalaxies at all redshifts.

Stellar and black hole assembly in z<0.3 infrared-luminous mergers: intermittent starbursts vs. super-Eddington accretion