{
  "id": "1504.03326",
  "version": "v1",
  "published": "2015-04-13T20:00:47.000Z",
  "updated": "2015-04-13T20:00:47.000Z",
  "title": "The Differential Size Growth of Field and Cluster Galaxies at z=2.1 Using the ZFOURGE Survey",
  "authors": [
    "Rebecca J. Allen",
    "Glenn G. Kacprzak",
    "Lee R. Spitler",
    "Karl Glazebrook",
    "Ivo Labbé",
    "Kim-Vy H. Tran",
    "Caroline M. S. Straatman",
    "Themiya Nanayakkara",
    "Ryan F. Quadri",
    "Michael Cowley",
    "Andy Monson",
    "Casey Papovich",
    "S. Eric Persson",
    "Glen Rees",
    "V. Tilvi",
    "Adam R. Tomczak"
  ],
  "comment": "11 pages, 8 figures, accepted by ApJ. Information on ZFOURGE can be found at http://zfourge.tamu.edu",
  "categories": [
    "astro-ph.GA"
  ],
  "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 Spitler et al. (2012) and 478 field galaxies with log(M)>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 HST/F160W imaging. We find consistent mass normalized (log(M)=10.7) sizes for quiescent field galaxies ($r_{1/2,maj}=1.81\\pm0.29$ kpc) and quiescent cluster galaxies ($r_{1/2,maj}=2.17\\pm0.63$ kpc). The mass normalized size of star-forming cluster galaxies ($r_{1/2,maj}=4.00\\pm0.26$ kpc ) is 12% larger (KS test $2.1\\sigma$) than star-forming field galaxies ($r_{1/2,maj}=3.57\\pm0.10$ kpc). From the mass-color relation we find that quiescent field galaxies with 9.7<log(M)<10.4 are slightly redder (KS test $3.6\\sigma$) than quiescent cluster galaxies, while cluster and field quiescent galaxies with log(M)>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)>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~2.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-04-13T20:00:47.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cluster galaxies",
      "differential size growth",
      "zfourge survey",
      "galaxy semi-major axis half-light",
      "semi-major axis half-light radii"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}