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The differential size growth of field and cluster galaxies at z=2.1 using the zFourGE survey

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Abstract
There is ongoing debate regarding the extent that environment affects galaxy size growth beyond z >= 1. To investigate the differences in star-forming and quiescent galaxy properties as a function of environment at z = 2.1, we create a mass-complete sample of 59 cluster galaxies and 478 field galaxies with log(M-*/M-circle dot) >= 9 using photometric redshifts from the ZFOURGE survey. We compare the mass-size relation of field and cluster galaxies using measured galaxy semi-major axis half-light radii (r(1/2, maj)) from CANDELS Hubble Space Telescope (HST)/ F160W imaging. We find consistent mass-normalized (log(M-*/M-circle dot) = 10.7) sizes for quiescent field galaxies (r(1/2, maj) = 1.81 +/- 0.29 kpc) and quiescent cluster galaxies (r(1/2, maj) = 2.17 +/- 0.63 kpc). The mass-normalized size of star-forming cluster galaxies (r(1/2, maj) = 4.00 +/- 0.26 kpc) is 12% larger (Kolmogorov-Smirnov (KS) test 2.1 sigma) than star-forming field galaxies (r(1/2, maj) = 3.57 +/- 0.10 kpc). From the mass-color relation we find that quiescent field galaxies with 9.7 < log(M-*/M-circle dot) <= 10.4 are slightly redder (KS test 3.6 sigma) than quiescent cluster galaxies, while cluster and field quiescent galaxies with log(M-*/M-circle dot) > 10.4 have consistent colors. We find that star-forming cluster galaxies are on average 20% redder than star-forming field galaxies at all masses. Furthermore, we stack galaxy images to measure average radial color profiles as a function of mass. Negative color gradients are only present for massive star-forming field and cluster galaxies with log(M-*/M-circle dot) > 10.4; the remaining galaxy masses and types have flat profiles. Our results suggest, given the observed differences in size and color of star-forming field and cluster galaxies, that the environment has begun to influence/accelerate their evolution. However, the lack of differences between field and cluster quiescent galaxies indicates that the environment has not begun to significantly influence their evolution at z similar to 2.
Keywords
HUBBLE-SPACE-TELESCOPE, SIMILAR-TO 2, MORPHOLOGY-DENSITY RELATION, EXTRAGALACTIC LEGACY SURVEY, STAR-FORMING GALAXY, INSIDE-OUT GROWTH, LESS-THAN 1.5, QUIESCENT GALAXIES, MASSIVE GALAXIES, ELLIPTIC GALAXIES, galaxies: clusters: general, galaxies: evolution, galaxies: high-redshift, galaxies: structure

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Chicago
Allen, Rebecca J, Glenn G Kacprzak, Lee R Spitler, Karl Glazebrook, Ivo Labbe, Kim-Vy H Tran, Caroline Straatman, et al. 2015. “The Differential Size Growth of Field and Cluster Galaxies at Z=2.1 Using the zFourGE Survey.” Astrophysical Journal 806 (1).
APA
Allen, R. J., Kacprzak, G. G., Spitler, L. R., Glazebrook, K., Labbe, I., Tran, K.-V. H., Straatman, C., et al. (2015). The differential size growth of field and cluster galaxies at z=2.1 using the zFourGE survey. ASTROPHYSICAL JOURNAL, 806(1).
Vancouver
1.
Allen RJ, Kacprzak GG, Spitler LR, Glazebrook K, Labbe I, Tran K-VH, et al. The differential size growth of field and cluster galaxies at z=2.1 using the zFourGE survey. ASTROPHYSICAL JOURNAL. 2015;806(1).
MLA
Allen, Rebecca J, Glenn G Kacprzak, Lee R Spitler, et al. “The Differential Size Growth of Field and Cluster Galaxies at Z=2.1 Using the zFourGE Survey.” ASTROPHYSICAL JOURNAL 806.1 (2015): n. pag. Print.
@article{8582620,
  abstract     = {There is ongoing debate regarding the extent that environment affects galaxy size growth beyond z >= 1. To investigate the differences in star-forming and quiescent galaxy properties as a function of environment at z = 2.1, we create a mass-complete sample of 59 cluster galaxies and 478 field galaxies with log(M-*/M-circle dot) >= 9 using photometric redshifts from the ZFOURGE survey. We compare the mass-size relation of field and cluster galaxies using measured galaxy semi-major axis half-light radii (r(1/2, maj)) from CANDELS Hubble Space Telescope (HST)/ F160W imaging. We find consistent mass-normalized (log(M-*/M-circle dot) = 10.7) sizes for quiescent field galaxies (r(1/2, maj) = 1.81 +/- 0.29 kpc) and quiescent cluster galaxies (r(1/2, maj) = 2.17 +/- 0.63 kpc). The mass-normalized size of star-forming cluster galaxies (r(1/2, maj) = 4.00 +/- 0.26 kpc) is 12% larger (Kolmogorov-Smirnov (KS) test 2.1 sigma) than star-forming field galaxies (r(1/2, maj) = 3.57 +/- 0.10 kpc). From the mass-color relation we find that quiescent field galaxies with 9.7 < log(M-*/M-circle dot) <= 10.4 are slightly redder (KS test 3.6 sigma) than quiescent cluster galaxies, while cluster and field quiescent galaxies with log(M-*/M-circle dot) > 10.4 have consistent colors. We find that star-forming cluster galaxies are on average 20% redder than star-forming field galaxies at all masses. Furthermore, we stack galaxy images to measure average radial color profiles as a function of mass. Negative color gradients are only present for massive star-forming field and cluster galaxies with log(M-*/M-circle dot) > 10.4; the remaining galaxy masses and types have flat profiles. Our results suggest, given the observed differences in size and color of star-forming field and cluster galaxies, that the environment has begun to influence/accelerate their evolution. However, the lack of differences between field and cluster quiescent galaxies indicates that the environment has not begun to significantly influence their evolution at z similar to 2.},
  articleno    = {3},
  author       = {Allen, Rebecca J and Kacprzak, Glenn G and Spitler, Lee R and Glazebrook, Karl and Labbe, Ivo and Tran, Kim-Vy H and Straatman, Caroline and Nanayakkara, Themiya and Brammer, Gabriel B and Quadri, Ryan F and Cowley, Michael and Monson, Andy and Papovich, Casey and Persson, S Eric and Rees, Glen and Tilvi, V and Tomczak, Adam R},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {HUBBLE-SPACE-TELESCOPE,SIMILAR-TO 2,MORPHOLOGY-DENSITY RELATION,EXTRAGALACTIC LEGACY SURVEY,STAR-FORMING GALAXY,INSIDE-OUT GROWTH,LESS-THAN 1.5,QUIESCENT GALAXIES,MASSIVE GALAXIES,ELLIPTIC GALAXIES,galaxies: clusters: general,galaxies: evolution,galaxies: high-redshift,galaxies: structure},
  language     = {eng},
  number       = {1},
  pages        = {11},
  title        = {The differential size growth of field and cluster galaxies at z=2.1 using the zFourGE survey},
  url          = {http://dx.doi.org/10.1088/0004-637X/806/1/3},
  volume       = {806},
  year         = {2015},
}

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