The Size Evolution of Star-forming Galaxies since z ∼ 7 Using ZFOURGE
Article
Article Title | The Size Evolution of Star-forming Galaxies since z ∼ 7 Using ZFOURGE |
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ERA Journal ID | 45091 |
Article Category | Article |
Authors | Allen, Rebecca J., Kacprzak, Glenn G., Glazebrook, Karl, Labbé, Ivo, Tran, Kim-Vy H., Spitler, Lee R., Cowley, Michael, Nanayakkara, Themiya, Papovich, Casey, Quadri, Ryan, Straatman, Caroline M. S., Tilvi, Vithal and van Dokkum, Pieter |
Journal Title | The Astrophysical Journal Letters |
Journal Citation | 834 (2), pp. 1-7 |
Article Number | L11 |
Number of Pages | 7 |
Year | 2017 |
Publisher | IOP Publishing |
Place of Publication | United Kingdom |
ISSN | 2041-8205 |
2041-8213 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/2041-8213/834/2/L11 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/2041-8213/834/2/L11 |
Abstract | For the first time, we present the size evolution of a mass-complete (log(M ∗/M o) > 10) sample of star-forming galaxies over redshifts z = 1-7, selected from the FourStar Galaxy Evolution Survey. Observed H-band sizes are measured from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) Hubble Space Telescope (HST)/F160W imaging. Distributions of individual galaxy masses and sizes illustrate that a clear mass-size relation exists up to z ∼ 7. At z ∼ 7, we find that the average galaxy size from the mass-size relation is more compact at a fixed mass of log(M ∗/M o) = 10.1, with kpc, than at lower redshifts. This is consistent with our results from stacking the same CANDELS HST/F160W imaging, when we correct for galaxy position angle alignment. We find that the size evolution of star-forming galaxies is well fit by a power law of the form kpc, which is consistent with previous works for normal star-formers at 1 < z < 4. In order to compare our slope with those derived Lyman break galaxy studies, we correct for different IMFs and methodology and find a slope of -0.97 ± 0.02, which is shallower than that reported for the evolution of Lyman break galaxies (LBGs) at z > 4 (). Therefore, we conclude the LBGs likely represent a subset of highly star-forming galaxies that exhibit rapid size growth at z > 4. |
Keywords | galaxies: evolution; galaxies: high-redshift; galaxies: structure |
Contains Sensitive Content | Does not contain sensitive content |
Public Notes | For access to this article, please click on the URL link provided. |
Funder | Australian Research Council |
Byline Affiliations | Swinburne University of Technology |
Australian Astronomical Observatory, Australia | |
Leiden University, Netherlands | |
Texas A&M University, United States | |
Macquarie University | |
Max Planck Society, Germany | |
Yale University, United States |
https://research.usq.edu.au/item/w45x4/the-size-evolution-of-star-forming-galaxies-since-z-7-using-zfourge
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