Abstract:

We investigate the effects of galaxy environment on the evolution of thequiescent fraction ($f_\mathrm{Q}$) from z =0.8 to 0.0 usingspectroscopic redshifts and multi-wavelength imaging data from the PRIsmMUlti-object Survey (PRIMUS) and the Sloan Digitial Sky Survey (SDSS).Our stellar mass limited galaxy sample consists of ~14,000 PRIMUSgalaxies within z = 0.2-0.8 and ~64,000 SDSS galaxies within z =0.05-0.12. We classify the galaxies as quiescent or star-forming basedon an evolving specific star formation cut, and as low or high densityenvironments based on fixed cylindrical aperture environmentmeasurements on a volume-limited environment defining population. Forquiescent and star-forming galaxies in low or high density environments,we examine the evolution of their stellar mass function (SMF). Thenusing the SMFs we compute $f_\mathrm{Q}(M_{*})$ and quantify itsevolution within our redshift range. We find that the quiescent fractionis higher at higher masses and in denser environments. The quiescentfraction rises with cosmic time for all masses and environments. At afiducial mass of $10^{10.5}M_\odot$, from z~0.7 to 0.1, the quiescent

Notes:

14 pages, 6 figures

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