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The average stellar mass (Mstar) of high-mass galaxies (Mstar > 3e11 Msun) isexpected to grow by ~30% since z~1, largely through ongoing mergers that arealso invoked to explain the observed increase in galaxy sizes. Direct evidencefor the corresponding growth in stellar mass has been elusive, however, in partbecause the volumes sampled by previous redshift surveys have been too small toyield reliable statistics. In this work, we make use of the Stripe 82 MassiveGalaxy Catalog to build a mass-limited sample of 41,770 galaxies (Mstar >1.6e11) with optical to near-IR photometry and a large fraction (>55%) ofspectroscopic redshifts. Our sample spans 139 square degrees, significantlylarger than most previous efforts. After accounting for a number of potentialsystematic errors, including the effects of Mstar scatter, we measure galaxystellar mass functions over 0.3 < z < 0.65 and detect no growth in the typicalMstar of massive galaxies with an uncertainty of 9%. This confidence level isdominated by uncertainties in the star formation history assumed for Mstarestimates, although our inability to characterize low surface-brightnessoutskirts may be the most important limitation of our study. Even among thesehigh-mass galaxies, we find evidence for differential evolution when splittingthe sample by recent star formation (SF) activity. While low-SF systems appearto become completely passive, we find a mostly sub-dominant population ofgalaxies with residual, but low rates of star formation (~1 Msun/yr) numberdensity does not evolve. Interestingly, these galaxies become more prominent athigher Mstar, representing ~10% of all galaxies at Mstar ~ 1e12 Msun andperhaps dominating at even larger masses.

The Stripe 82 Massive Galaxy Project III: A Lack of Growth Among Massive Galaxies