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COSMOS-DASH : the evolution of the galaxy size-mass relation since z ∼ 3 from new wide-field WFC3 imaging combined with CANDELS/3D-HST

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Abstract
We present COSMOS-Drift And SHift (DASH), a Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) imaging survey of the COSMOS field in the H-160 filter. The survey comprises 456 individual WFC3 pointings corresponding to an area of 0.49 deg(2) (0.66 deg(2) when including archival data) and reaches a 5 sigma point-source limit of H-160 = 25.1 (0 ''.3 aperture). COSMOS-DASH is the widest HST/WFC3 imaging survey in the H-160 filter, tripling the extragalactic survey area in the near-infrared at HST resolution. We make the reduced H-160 mosaic available to the community. We use this data set to measure the sizes of 169 galaxies with log(M-star/M) > 11.3 at 1.5 < z < 3.0 and augment this sample with 749 galaxies at 0.1 < z < 1.5 using archival ACS imaging. We find that the median size of galaxies in this mass range changes with redshift as < r(eff)> = (13.4 +/- 0.5) x (1 + z)((-0.95 +/- 0.05)) kpc. Separating the galaxies into star-forming and quiescent galaxies using their rest-frame U - V and V - J colors, we find no statistical difference between the median sizes of the most massive star-forming and quiescent galaxies at < z > = 2.5: they are 4.9 +/- 0.9 kpc and 4.3 +/- 0.3 kpc, respectively. However, we do find a significant difference in the Sersic index between the two samples, such that massive quiescent galaxies have higher central densities than star-forming galaxies. We extend the size-mass analysis to lower masses by combining it with the 3D-HST/CANDELS sample of van der Wel et al. and derive empirical relations between size, mass, and redshift. Fitting a relation of the form r(eff) = A x m(star)(alpha) with m(star) = M-star/5 x 10(10) M-circle dot and r(eff) in kpc, we find log A = -0.25 log(1 + z) + 0.80 and alpha = -0.13 log(1 + z) + 0.27. We also provide relations for the subsamples of star-forming and quiescent galaxies. Our results confirm previous studies that were based on smaller samples or ground-based imaging.
Keywords
INSIDE-OUT GROWTH, STAR-FORMATION, DISK GALAXIES, QUIESCENT GALAXIES, SURFACE-DENSITY, MINOR MERGERS, SERSIC INDEX, DEEP FIELD, STELLAR, COMPACT, galaxies: evolution, galaxies: high-redshift, galaxies: photometry, galaxies: structure

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MLA
Mowla, Lamiya A., et al. “COSMOS-DASH : The Evolution of the Galaxy Size-Mass Relation since z ∼ 3 from New Wide-Field WFC3 Imaging Combined with CANDELS/3D-HST.” ASTROPHYSICAL JOURNAL, vol. 880, no. 1, 2019.
APA
Mowla, L. A., van Dokkum, P., Brammer, G. B., Momcheva, I., van der Wel, A., Whitaker, K., … Marchesini, D. (2019). COSMOS-DASH : the evolution of the galaxy size-mass relation since z ∼ 3 from new wide-field WFC3 imaging combined with CANDELS/3D-HST. ASTROPHYSICAL JOURNAL, 880(1).
Chicago author-date
Mowla, Lamiya A, Pieter van Dokkum, Gabriel B Brammer, Ivelina Momcheva, Arjen van der Wel, Katherine Whitaker, Erica Nelson, et al. 2019. “COSMOS-DASH : The Evolution of the Galaxy Size-Mass Relation since z ∼ 3 from New Wide-Field WFC3 Imaging Combined with CANDELS/3D-HST.” ASTROPHYSICAL JOURNAL 880 (1).
Chicago author-date (all authors)
Mowla, Lamiya A, Pieter van Dokkum, Gabriel B Brammer, Ivelina Momcheva, Arjen van der Wel, Katherine Whitaker, Erica Nelson, Rachel Bezanson, Adam Muzzin, Marijn Franx, John MacKenty, Joel Leja, Mariska Kriek, and Danilo Marchesini. 2019. “COSMOS-DASH : The Evolution of the Galaxy Size-Mass Relation since z ∼ 3 from New Wide-Field WFC3 Imaging Combined with CANDELS/3D-HST.” ASTROPHYSICAL JOURNAL 880 (1).
Vancouver
1.
Mowla LA, van Dokkum P, Brammer GB, Momcheva I, van der Wel A, Whitaker K, et al. COSMOS-DASH : the evolution of the galaxy size-mass relation since z ∼ 3 from new wide-field WFC3 imaging combined with CANDELS/3D-HST. ASTROPHYSICAL JOURNAL. 2019;880(1).
IEEE
[1]
L. A. Mowla et al., “COSMOS-DASH : the evolution of the galaxy size-mass relation since z ∼ 3 from new wide-field WFC3 imaging combined with CANDELS/3D-HST,” ASTROPHYSICAL JOURNAL, vol. 880, no. 1, 2019.
@article{8624507,
  abstract     = {{We present COSMOS-Drift And SHift (DASH), a Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) imaging survey of the COSMOS field in the H-160 filter. The survey comprises 456 individual WFC3 pointings corresponding to an area of 0.49 deg(2) (0.66 deg(2) when including archival data) and reaches a 5 sigma point-source limit of H-160 = 25.1 (0 ''.3 aperture). COSMOS-DASH is the widest HST/WFC3 imaging survey in the H-160 filter, tripling the extragalactic survey area in the near-infrared at HST resolution. We make the reduced H-160 mosaic available to the community. We use this data set to measure the sizes of 169 galaxies with log(M-star/M) > 11.3 at 1.5 < z < 3.0 and augment this sample with 749 galaxies at 0.1 < z < 1.5 using archival ACS imaging. We find that the median size of galaxies in this mass range changes with redshift as < r(eff)> = (13.4 +/- 0.5) x (1 + z)((-0.95 +/- 0.05)) kpc. Separating the galaxies into star-forming and quiescent galaxies using their rest-frame U - V and V - J colors, we find no statistical difference between the median sizes of the most massive star-forming and quiescent galaxies at < z > = 2.5: they are 4.9 +/- 0.9 kpc and 4.3 +/- 0.3 kpc, respectively. However, we do find a significant difference in the Sersic index between the two samples, such that massive quiescent galaxies have higher central densities than star-forming galaxies. We extend the size-mass analysis to lower masses by combining it with the 3D-HST/CANDELS sample of van der Wel et al. and derive empirical relations between size, mass, and redshift. Fitting a relation of the form r(eff) = A x m(star)(alpha) with m(star) = M-star/5 x 10(10) M-circle dot and r(eff) in kpc, we find log A = -0.25 log(1 + z) + 0.80 and alpha = -0.13 log(1 + z) + 0.27. We also provide relations for the subsamples of star-forming and quiescent galaxies. Our results confirm previous studies that were based on smaller samples or ground-based imaging.}},
  articleno    = {{57}},
  author       = {{Mowla, Lamiya A and van Dokkum, Pieter and Brammer, Gabriel B and Momcheva, Ivelina and van der Wel, Arjen and Whitaker, Katherine and Nelson, Erica and Bezanson, Rachel and Muzzin, Adam and Franx, Marijn and MacKenty, John and Leja, Joel and Kriek, Mariska and Marchesini, Danilo}},
  issn         = {{0004-637X}},
  journal      = {{ASTROPHYSICAL JOURNAL}},
  keywords     = {{INSIDE-OUT GROWTH,STAR-FORMATION,DISK GALAXIES,QUIESCENT GALAXIES,SURFACE-DENSITY,MINOR MERGERS,SERSIC INDEX,DEEP FIELD,STELLAR,COMPACT,galaxies: evolution,galaxies: high-redshift,galaxies: photometry,galaxies: structure}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{27}},
  title        = {{COSMOS-DASH : the evolution of the galaxy size-mass relation since z ∼ 3 from new wide-field WFC3 imaging combined with CANDELS/3D-HST}},
  url          = {{http://dx.doi.org/10.3847/1538-4357/ab290a}},
  volume       = {{880}},
  year         = {{2019}},
}

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