The evolution of the galaxy UV luminosity function at redshifts z ≃ 8 - 15 from deep JWST and ground-based near-infrared imaging - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2023

The evolution of the galaxy UV luminosity function at redshifts z ≃ 8 - 15 from deep JWST and ground-based near-infrared imaging

C. T. Donnan
  • Function : Author
D. J. Mcleod
  • Function : Author
J. S. Dunlop
  • Function : Author
R. J. Mclure
  • Function : Author
A. C. Carnall
  • Function : Author
R. Begley
  • Function : Author
F. Cullen
  • Function : Author
M. L. Hamadouche
  • Function : Author
R. A. A. Bowler
  • Function : Author
D. Magee
  • Function : Author
B. Milvang-Jensen
  • Function : Author
T. Targett
  • Function : Author

Abstract

We reduce and analyse the available JWST ERO and ERS NIRCam imaging (SMACS0723, GLASS, CEERS) in combination with the latest deep ground-based near-infrared imaging in the COSMOS field (provided by UltraVISTA DR5) to produce a new measurement of the evolving galaxy UV luminosity function (LF) over the redshift range z = 8 - 15. This yields a new estimate of the evolution of UV luminosity density (ρUV), and hence cosmic star formation rate density (ρSFR) out to within <300 Myr of the Big Bang. Our results confirm that the high-redshift LF is best described by a double power law (rather than a Schechter) function up to z ~ 10, and that the LF and the resulting derived ρUV (and thus ρSFR), continues to decline gradually and steadily up to z ~ 15 (as anticipated from previous studies which analysed the pre-existing data in a consistent manner to this study). We provide details of the 61 high-redshift galaxy candidates, 47 of which are new, that have enabled this new analysis. Our sample contains 6 galaxies at z ≥ 12, one of which appears to set a new redshift record as an apparently robust galaxy candidate at z ≃ 16.4, the properties of which we therefore consider in detail. The advances presented here emphasize the importance of achieving high dynamic range in studies of early galaxy evolution, and re-affirm the enormous potential of forthcoming larger JWST programmes to transform our understanding of the young Universe.
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Dates and versions

insu-03947312 , version 1 (12-07-2023)

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C. T. Donnan, D. J. Mcleod, J. S. Dunlop, R. J. Mclure, A. C. Carnall, et al.. The evolution of the galaxy UV luminosity function at redshifts z ≃ 8 - 15 from deep JWST and ground-based near-infrared imaging. Monthly Notices of the Royal Astronomical Society, 2023, 518, pp.6011-6040. ⟨10.1093/mnras/stac3472⟩. ⟨insu-03947312⟩
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