John Moustakas
PRIMUS: Constraints on Star Formation Quenching and Galaxy Merging, and the Evolution of the Stellar Mass Function from z = 0-1
Moustakas, John; Coil, Alison L.; Aird, James; Blanton, Michael R.; Cool, Richard J.; Eisenstein, Daniel J.; Mendez, Alexander J.; Wong, Kenneth C.; Zhu, Guangtun; Arnouts, Stéphane
Authors
Alison L. Coil
James Aird
Michael R. Blanton
Richard J. Cool
Daniel J. Eisenstein
Alexander J. Mendez
Kenneth C. Wong
Guangtun Zhu
Stéphane Arnouts
Abstract
We measure the evolution of the stellar mass function (SMF) from z = 0-1 using multi-wavelength imaging and spectroscopic redshifts from the PRism MUlti-object Survey (PRIMUS) and the Sloan Digital Sky Survey (SDSS). From PRIMUS we construct an i < 23 flux-limited sample of ~40, 000 galaxies at z = 0.2-1.0 over five fields totaling ≈5.5 deg2, and from the SDSS we select ~170, 000 galaxies at z = 0.01-0.2 that we analyze consistently with respect to PRIMUS to minimize systematic errors in our evolutionary measurements. We find that the SMF of all galaxies evolves relatively little since z = 1, although we do find evidence for mass assembly downsizing; we measure a ≈30% increase in the number density of ~1010 $\mathcal {M}_{\odot }$ galaxies since z ≈ 0.6, and a lsim 10% change in the number density of all gsim 1011 $\mathcal {M}_{\odot }$ galaxies since z ≈ 1. Dividing the sample into star-forming and quiescent using an evolving cut in specific star formation rate, we find that the number density of ~1010 $\mathcal {M}_{\odot }$ star-forming galaxies stays relatively constant since z ≈ 0.6, whereas the space density of gsim 1011 $\mathcal {M}_{\odot }$ star-forming galaxies decreases by ≈50% between z ≈ 1 and z ≈ 0. Meanwhile, the number density of ~1010 $\mathcal {M}_{\odot }$ quiescent galaxies increases steeply toward low redshift, by a factor of ~2-3 since z ≈ 0.6, while the number of massive quiescent galaxies remains approximately constant since z ≈ 1. These results suggest that the rate at which star-forming galaxies are quenched increases with decreasing stellar mass, but that the bulk of the stellar mass buildup within the quiescent population occurs around ~1010.8 $\mathcal {M}_{\odot }$. In addition, we conclude that mergers do not appear to be a dominant channel for the stellar mass buildup of galaxies at z < 1, even among massive (gsim 1011 $\mathcal {M}_{\odot }$) quiescent galaxies.
Citation
Moustakas, J., Coil, A. L., Aird, J., Blanton, M. R., Cool, R. J., Eisenstein, D. J., …Arnouts, S. (2013). PRIMUS: Constraints on Star Formation Quenching and Galaxy Merging, and the Evolution of the Stellar Mass Function from z = 0-1. Astrophysical Journal, 767(1), Article 50. https://doi.org/10.1088/0004-637x/767/1/50
Journal Article Type | Article |
---|---|
Publication Date | Apr 10, 2013 |
Deposit Date | May 15, 2013 |
Publicly Available Date | Jun 27, 2014 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 767 |
Issue | 1 |
Article Number | 50 |
DOI | https://doi.org/10.1088/0004-637x/767/1/50 |
Keywords | Galaxies: evolution, Galaxies: high-redshift, Large-scale structure of universe, Surveys. |
Public URL | https://durham-repository.worktribe.com/output/1455957 |
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Copyright Statement
© 2013. The American Astronomical Society. All rights reserved.
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