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We estimate the galaxy stellar mass function and stellar mass density forstar-forming and quiescent galaxies with 0.2<z<4. We construct a deep K<24sample of 220000 galaxies selected using the UltraVISTA DR1 data release. Ouranalysis is based on precise 30-band photometric redshifts. By comparing thesephotometric redshifts with 10800 spectroscopic redshifts from the zCOSMOSbright and faint surveys, we find a precision of sigma(dz/(1+z))=0.008 ati<22.5 and sigma(dz/(1+zs))=0.03 at 1.5<z<4. We derive the stellar massfunction and correct for the Eddington bias. We find a mass-dependent evolutionof the global and star-forming populations. This mass-dependent evolution is adirect consequence of the star formation being quenched in galaxies moremassive than M>10^10.7Msun. For the mass function of the quiescent galaxies, wedo not find any significant evolution of the high-mass end at z<1; however weobserve a clear flattening of the faint-end slope. From z~3 to z~1, the densityof quiescent galaxies increases over the entire mass range. Their comovingstellar mass density increases by 1.6 dex between z~3 and z~1 and by less than0.2dex at z<1. We infer the star formation history from the mass densityevolution and we find an excellent agreement with instantaneous star formationrate measurements at z<1.5, while we find differences of 0.2dex at z>1.5consistent with the expected uncertainties. We also develop a new method toinfer the specific star formation rate from the mass function of star-forminggalaxies. We find that the specific star formation rate of 10^10Msun galaxiesincreases continuously in the redshift range 1<z<4. Finally, we compare ourresults with a semi-analytical model and find that these models overestimatethe density of low mass quiescent galaxies by an order of magnitude, while thedensity of low-mass star-forming galaxies is successfully reproduced.

Mass assembly in quiescent and star-forming galaxies since z=4 from UltraVISTA