Skip to main content
eScholarship
Open Access Publications from the University of California

PRIMUS: EFFECTS of GALAXY ENVIRONMENT on the QUIESCENT FRACTION EVOLUTION at z < 0.8

  • Author(s): Hahn, C
  • Blanton, MR
  • Moustakas, J
  • Coil, AL
  • Cool, RJ
  • Eisenstein, DJ
  • Skibba, RA
  • Wong, KC
  • Zhu, G
  • et al.

Published Web Location

https://iopscience.iop.org/article/10.1088/0004-637X/806/2/162/meta
No data is associated with this publication.
Abstract

© 2015. The American Astronomical Society. All rights reserved. We investigate the effects of galaxy environment on the evolution of the quiescent fraction (fQ) from z = 0.8 to 0.0 using spectroscopic redshifts and multi-wavelength imaging data from the PRIsm MUlti-object Survey (PRIMUS) and the Sloan Digital Sky Survey (SDSS). Our stellar mass limited galaxy sample consists of ∼14,000 PRIMUS galaxies 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 (SF) based on an evolving specific star formation cut, and as low or high density environments based on fixed cylindrical aperture environment measurements on a volume-limited environment defining population. For quiescent and SF galaxies in low or high density environments, we examine the evolution of their stellar mass function (SMF). Then using the SMFs we compute fQ (M∗) and quantify its evolution within our redshift range. We find that the quiescent fraction is higher at higher masses and in denser environments. The quiescent fraction rises with cosmic time for all masses and environments. At a fiducial mass of 1010.5 M⊙, from z ∼ 0.7 to 0.1, the quiescent fraction rises by 15% at the lowest environments and by 25% at the highest environments we measure. These results suggest that for a minority of galaxies their cessation of star formation is due to external influences on them. In other words, in the recent universe a substantial fraction of the galaxies that cease forming stars do so due to internal processes.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Item not freely available? Link broken?
Report a problem accessing this item