The Size Evolution of Star-forming Galaxies since z ∼ 7 Using ZFOURGE

Article


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. 2017. "The Size Evolution of Star-forming Galaxies since z ∼ 7 Using ZFOURGE." The Astrophysical Journal Letters. 834 (2), pp. 1-7. https://doi.org/10.3847/2041-8213/834/2/L11
Article Title

The Size Evolution of Star-forming Galaxies since z ∼ 7 Using ZFOURGE

ERA Journal ID45091
Article CategoryArticle
AuthorsAllen, 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 TitleThe Astrophysical Journal Letters
Journal Citation834 (2), pp. 1-7
Article NumberL11
Number of Pages7
Year2017
PublisherIOP Publishing
Place of PublicationUnited Kingdom
ISSN2041-8205
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.

Keywordsgalaxies: evolution; galaxies: high-redshift; galaxies: structure
Contains Sensitive ContentDoes not contain sensitive content
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FunderAustralian Research Council
Byline AffiliationsSwinburne 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
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