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Abstract
For the first time, we present the size evolution of a mass-complete (log(M-*/M-circle dot) > 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 similar to 7. At z similar to 7, we find that the average galaxy size from the mass-size relation is more compact at a fixed mass of log(M-*/M-circle dot) = 10.1, with r(1/2),(maj) = 1.02 +/- 0.29 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 r(e) = 7.07 (1+ z)(-0.89) 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 (r(e) proportional to (1 + z) (1.2 +/- 0.06)). Therefore, we conclude the LBGs likely represent a subset of highly star-forming galaxies that exhibit rapid size growth at z > 4.
Keywords
SPACE-TELESCOPE OBSERVATIONS, EXTRAGALACTIC LEGACY SURVEY, LYMAN BREAK, GALAXIES, QUIESCENT GALAXIES, MASSIVE QUIESCENT, DEEP FIELD, CANDELS, MORPHOLOGIES, POPULATION, STELLAR, galaxies: evolution, galaxies: high-redshift, galaxies: structure

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MLA
Allen, Rebecca J, Glenn G Kacprzak, Karl Glazebrook, et al. “The Size Evolution of Star-forming Galaxies Since z ∼ 7 Using zFourGE.” ASTROPHYSICAL JOURNAL LETTERS 834.2 (2017): n. pag. Print.
APA
Allen, R. J., Kacprzak, G. G., Glazebrook, K., Labbe, I., Tran, K.-V. H., Spitler, L. R., Cowley, M., et al. (2017). The size evolution of star-forming galaxies since z ∼ 7 using zFourGE. ASTROPHYSICAL JOURNAL LETTERS, 834(2).
Chicago author-date
Allen, Rebecca J, Glenn G Kacprzak, Karl Glazebrook, Ivo Labbe, Kim-Vy H Tran, Lee R Spitler, Michael Cowley, et al. 2017. “The Size Evolution of Star-forming Galaxies Since z ∼ 7 Using zFourGE.” Astrophysical Journal Letters 834 (2).
Chicago author-date (all authors)
Allen, Rebecca J, Glenn G Kacprzak, Karl Glazebrook, Ivo Labbe, Kim-Vy H Tran, Lee R Spitler, Michael Cowley, Themiya Nanayakkara, Casey Papovich, Ryan Quadri, Caroline Straatman, Vithal Tilvi, and Pieter van Dokkum. 2017. “The Size Evolution of Star-forming Galaxies Since z ∼ 7 Using zFourGE.” Astrophysical Journal Letters 834 (2).
Vancouver
1.
Allen RJ, Kacprzak GG, Glazebrook K, Labbe I, Tran K-VH, Spitler LR, et al. The size evolution of star-forming galaxies since z ∼ 7 using zFourGE. ASTROPHYSICAL JOURNAL LETTERS. 2017;834(2).
IEEE
[1]
R. J. Allen et al., “The size evolution of star-forming galaxies since z ∼ 7 using zFourGE,” ASTROPHYSICAL JOURNAL LETTERS, vol. 834, no. 2, 2017.
@article{8582603,
  abstract     = {For the first time, we present the size evolution of a mass-complete (log(M-*/M-circle dot) > 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 similar to 7. At z similar to 7, we find that the average galaxy size from the mass-size relation is more compact at a fixed mass of log(M-*/M-circle dot) = 10.1, with r(1/2),(maj) = 1.02 +/- 0.29 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 r(e) = 7.07 (1+ z)(-0.89) 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 (r(e) proportional to (1 + z) (1.2 +/- 0.06)). Therefore, we conclude the LBGs likely represent a subset of highly star-forming galaxies that exhibit rapid size growth at z > 4.},
  articleno    = {L11},
  author       = {Allen, Rebecca J and Kacprzak, Glenn G and Glazebrook, Karl and Labbe, Ivo and Tran, Kim-Vy H and Spitler, Lee R and Cowley, Michael and Nanayakkara, Themiya and Papovich, Casey and Quadri, Ryan and Straatman, Caroline and Tilvi, Vithal and van Dokkum, Pieter},
  issn         = {2041-8205},
  journal      = {ASTROPHYSICAL JOURNAL LETTERS},
  keywords     = {SPACE-TELESCOPE OBSERVATIONS,EXTRAGALACTIC LEGACY SURVEY,LYMAN BREAK,GALAXIES,QUIESCENT GALAXIES,MASSIVE QUIESCENT,DEEP FIELD,CANDELS,MORPHOLOGIES,POPULATION,STELLAR,galaxies: evolution,galaxies: high-redshift,galaxies: structure},
  language     = {eng},
  number       = {2},
  pages        = {7},
  title        = {The size evolution of star-forming galaxies since z ∼ 7 using zFourGE},
  url          = {http://dx.doi.org/10.3847/2041-8213/834/2/L11},
  volume       = {834},
  year         = {2017},
}

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