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The sizes of massive quiescent and star-forming galaxies at z ∼ 4 with zFourGE and CANDELS

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Abstract
We study the rest-frame ultraviolet (UV) sizes of massive (similar to 0.8 x 10(11)M(circle dot).) galaxies at 3.4 <= z < 4.2, selected from the FourStar Galaxy Evolution Survey, by fitting single Sersic profiles to Hubble Space Telescope/WFC3/F160W images from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey. Massive quiescent galaxies are very compact, with a median circularized half-light radius re = 0.63 +/- 0.18 kpc. Removing 5 16 (31%) sources with signs of active galactic nucleus activity does not change the result. Star-forming galaxies have re = 2.0 +/- 0.60 kpc, 3.2 +/- 1.3 x larger than quiescent galaxies. Quiescent galaxies at z similar to 4 are on average 6.0 +/- 1.7 x smaller than at z similar to 0 and 1.9 +/- 0.7 x smaller than at z similar to 2. Star-forming galaxies of the same stellar mass are 2.4 +/- 0.7 x smaller than at z similar to 0. Overall, the size evolution at 0 < z < 4 is well described by a power law, with re 5.08 +/- 0.28(1 + z)(-1.44 perpendicular to 0.08) kpc for quiescent galaxies and r(e) = 6.02 +/- 0.28(1 + z)(-0.72 perpendicular to 0.05) kpc for star-forming galaxies. Compact star-forming galaxies are rare in our sample: we find only1/14 (7%) with r(e)/(M/10(11)M(circle dot))(0.75) < 1.5 11 0.75 <., whereas 13 16 (81%) of the quiescent galaxies are compact. The number density of compact quiescent galaxies at z similar to 4 is 1.8 +/- 0.8 x 10(-5) Mpc(-3) and increases rapidly, by > 5x, between 2 < z < 4. The paucity of compact star-forming galaxies at z similar to 4 and their large rest-frame UV median sizes suggest that the formation phase of compact cores is very short and/or highly dust obscured.
Keywords
DEEP-FIELD-SOUTH, EXTRAGALACTIC LEGACY SURVEY, SUBMILLIMETER GALAXIES, PHOTOMETRIC REDSHIFTS, EVOLVED GALAXIES, STELLAR MASSES, GOODS-NORTH, SKY SURVEY, EVOLUTION, COMPACT, cosmology: observations, galaxies: evolution, galaxies: formation, galaxies: high-redshift, infrared: galaxies

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MLA
Straatman, Caroline, et al. “The Sizes of Massive Quiescent and Star-Forming Galaxies at z ∼ 4 with ZFourGE and CANDELS.” ASTROPHYSICAL JOURNAL LETTERS, vol. 808, no. 1, 2015, doi:10.1088/2041-8205/808/1/L29.
APA
Straatman, C., Labbe, I., Spitler, L. R., Glazebrook, K., Tomczak, A., Allen, R., … Whitaker, K. E. (2015). The sizes of massive quiescent and star-forming galaxies at z ∼ 4 with zFourGE and CANDELS. ASTROPHYSICAL JOURNAL LETTERS, 808(1). https://doi.org/10.1088/2041-8205/808/1/L29
Chicago author-date
Straatman, Caroline, Ivo Labbe, Lee R Spitler, Karl Glazebrook, Adam Tomczak, Rebecca Allen, Gabriel B Brammer, et al. 2015. “The Sizes of Massive Quiescent and Star-Forming Galaxies at z ∼ 4 with ZFourGE and CANDELS.” ASTROPHYSICAL JOURNAL LETTERS 808 (1). https://doi.org/10.1088/2041-8205/808/1/L29.
Chicago author-date (all authors)
Straatman, Caroline, Ivo Labbe, Lee R Spitler, Karl Glazebrook, Adam Tomczak, Rebecca Allen, Gabriel B Brammer, Michael Cowley, Pieter van Dokkum, Glenn G Kacprzak, Lalit Kawinwanichakij, Nicola Mehrtens, Themiya Nanayakkara, Casey Papovich, S Eric Persson, Ryan F Quadri, Glen Rees, Vithal Tilvi, Kim-Vy H Tran, and Katherine E Whitaker. 2015. “The Sizes of Massive Quiescent and Star-Forming Galaxies at z ∼ 4 with ZFourGE and CANDELS.” ASTROPHYSICAL JOURNAL LETTERS 808 (1). doi:10.1088/2041-8205/808/1/L29.
Vancouver
1.
Straatman C, Labbe I, Spitler LR, Glazebrook K, Tomczak A, Allen R, et al. The sizes of massive quiescent and star-forming galaxies at z ∼ 4 with zFourGE and CANDELS. ASTROPHYSICAL JOURNAL LETTERS. 2015;808(1).
IEEE
[1]
C. Straatman et al., “The sizes of massive quiescent and star-forming galaxies at z ∼ 4 with zFourGE and CANDELS,” ASTROPHYSICAL JOURNAL LETTERS, vol. 808, no. 1, 2015.
@article{8582619,
  abstract     = {{We study the rest-frame ultraviolet (UV) sizes of massive (similar to 0.8 x 10(11)M(circle dot).) galaxies at 3.4 <= z < 4.2, selected from the FourStar Galaxy Evolution Survey, by fitting single Sersic profiles to Hubble Space Telescope/WFC3/F160W images from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey. Massive quiescent galaxies are very compact, with a median circularized half-light radius re = 0.63 +/- 0.18 kpc. Removing 5 16 (31%) sources with signs of active galactic nucleus activity does not change the result. Star-forming galaxies have re = 2.0 +/- 0.60 kpc, 3.2 +/- 1.3 x larger than quiescent galaxies. Quiescent galaxies at z similar to 4 are on average 6.0 +/- 1.7 x smaller than at z similar to 0 and 1.9 +/- 0.7 x smaller than at z similar to 2. Star-forming galaxies of the same stellar mass are 2.4 +/- 0.7 x smaller than at z similar to 0. Overall, the size evolution at 0 < z < 4 is well described by a power law, with re 5.08 +/- 0.28(1 + z)(-1.44 perpendicular to 0.08) kpc for quiescent galaxies and r(e) = 6.02 +/- 0.28(1 + z)(-0.72 perpendicular to 0.05) kpc for star-forming galaxies. Compact star-forming galaxies are rare in our sample: we find only1/14 (7%) with r(e)/(M/10(11)M(circle dot))(0.75) < 1.5 11 0.75 <., whereas 13 16 (81%) of the quiescent galaxies are compact. The number density of compact quiescent galaxies at z similar to 4 is 1.8 +/- 0.8 x 10(-5) Mpc(-3) and increases rapidly, by > 5x, between 2 < z < 4. The paucity of compact star-forming galaxies at z similar to 4 and their large rest-frame UV median sizes suggest that the formation phase of compact cores is very short and/or highly dust obscured.}},
  articleno    = {{L29}},
  author       = {{Straatman, Caroline and Labbe, Ivo and Spitler, Lee R and Glazebrook, Karl and Tomczak, Adam and Allen, Rebecca and Brammer, Gabriel B and Cowley, Michael and van Dokkum, Pieter and Kacprzak, Glenn G and Kawinwanichakij, Lalit and Mehrtens, Nicola and Nanayakkara, Themiya and Papovich, Casey and Persson, S Eric and Quadri, Ryan F and Rees, Glen and Tilvi, Vithal and Tran, Kim-Vy H and Whitaker, Katherine E}},
  issn         = {{2041-8205}},
  journal      = {{ASTROPHYSICAL JOURNAL LETTERS}},
  keywords     = {{DEEP-FIELD-SOUTH,EXTRAGALACTIC LEGACY SURVEY,SUBMILLIMETER GALAXIES,PHOTOMETRIC REDSHIFTS,EVOLVED GALAXIES,STELLAR MASSES,GOODS-NORTH,SKY SURVEY,EVOLUTION,COMPACT,cosmology: observations,galaxies: evolution,galaxies: formation,galaxies: high-redshift,infrared: galaxies}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{8}},
  title        = {{The sizes of massive quiescent and star-forming galaxies at z ∼ 4 with zFourGE and CANDELS}},
  url          = {{http://doi.org/10.1088/2041-8205/808/1/L29}},
  volume       = {{808}},
  year         = {{2015}},
}

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