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We investigate the impact of local environment on the galaxy stellar massfunction (SMF) spanning a wide range of galaxy densities from the field up todense cores of massive galaxy clusters. Data are drawn from a sample of eightfields from the Observations of Redshift Evolution in Large-Scale Environments(ORELSE) survey. Deep photometry allow us to select mass-complete samples ofgalaxies down to 10^9 Msol. Taking advantage of >4000 secure spectroscopicredshifts from ORELSE and precise photometric redshifts, we construct3-dimensional density maps between 0.55<z<1.3 using a Voronoi tessellationapproach. We find that the shape of the SMF depends strongly on localenvironment exhibited by a smooth, continual increase in the relative numbersof high- to low-mass galaxies towards denser environments. A straightforwardimplication is that local environment proportionally increases the efficiencyof (a) destroying lower-mass galaxies and/or (b) growth of higher-massgalaxies. We also find a presence of this environmental dependence in the SMFsof star-forming and quiescent galaxies, although not quite as strongly for thequiescent subsample. To characterize the connection between the SMF of fieldgalaxies and that of denser environments we devise a simple semi-empiricalmodel. The model begins with a sample of ~10^6 galaxies at z_start=5 withstellar masses distributed according to the field. Simulated galaxies thenevolve down to z_final=0.8 following empirical prescriptions forstar-formation, quenching, and galaxy-galaxy merging. We run the simulationmultiple times, testing a variety of scenarios with differing overall amountsof merging. Our model suggests that a large number of mergers are required toreproduce the SMF in dense environments. Additionally, a large majority ofthese mergers would have to occur in intermediate density environments (e.g.galaxy groups).

Glimpsing the Imprint of Local Environment on the Galaxy Stellar Mass Function