Differences in the Structural Properties and Star Formation Rates of Field and Cluster Galaxies at Z ∼ 1
Article
Article Title | Differences in the Structural Properties and Star Formation Rates of Field and Cluster Galaxies at Z ∼ 1 |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Allen, Rebecca J., Kacprzak, Glenn G., Glazebrook, Karl, Tran, Kim-Vy H., Spitler, Lee R., Straatman, Caroline M. S., Cowley, Michael and Nanayakkara, Themiya |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 826 (1), pp. 1-12 |
Article Number | 60 |
Number of Pages | 12 |
Year | 2016 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/0004-637X/826/1/60 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/0004-637X/826/1/60 |
Abstract | We investigate the dependence of galaxy sizes and star formation rates (SFRs) on their environment using a mass-limited sample of quiescent and star-forming galaxies with log(M∗M) ≥ 9.5 at selected from the NEWFIRM medium-band Survey (NMBS). Using the Galaxy Environment Evolution Collaboration 2 spectroscopic cluster catalog and the accurate photometric redshifts from the NMBS, we select quiescent and star-forming cluster (σ = 490 km s-1) galaxies within two virial radius, Rvir, intervals of 2 > R vir > 0.5 and R vir < 0.5. Galaxies residing outside of the 2 R vir of both the cluster centers and the additional candidate over-densities are defined as our field sample. Galaxy structural parameters are measured from the COSMOS legacy Hubble Space Telescope/ACS F814W image. The sizes and Sérsic indices of quiescent field and cluster galaxies have the same distribution regardless of R vir. However, cluster star-forming galaxies within 0.5 R vir have lower mass-normalized average sizes by 16 ± 7%, and a higher fraction of Sérsic indices with , than field star-forming galaxies. The average SFRs of star-forming cluster galaxies show a trend of decreasing SFR with clustocentric radius. The mass-normalized average SFR of cluster star-forming galaxies is a factor of 2-2.5(7-9σ) lower than that of star-forming galaxies in the field. While we find no significant dependence on environment for quiescent galaxies, the properties of star-forming galaxies are affected, which could be the result of environment acting on their gas content. |
Keywords | galaxies: clusters: general; galaxies: evolution; galaxies: star formation; galaxies: structure |
Contains Sensitive Content | Does not contain sensitive content |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | Swinburne University of Technology |
Australian Astronomical Observatory, Australia | |
Texas A&M University, United States | |
Macquarie University | |
Leiden University, Netherlands |
https://research.usq.edu.au/item/w45xq/differences-in-the-structural-properties-and-star-formation-rates-of-field-and-cluster-galaxies-at-z-1
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