The Astrophysical Journal (Jan 2024)

EPOCHS. II. The Ultraviolet Luminosity Function from 7.5 < z < 13.5 Using 180 arcmin2 of Deep, Blank Fields from the PEARLS Survey and Public JWST Data

  • Nathan J. Adams,
  • Christopher J. Conselice,
  • Duncan Austin,
  • Thomas Harvey,
  • Leonardo Ferreira,
  • James Trussler,
  • Ignas Juodžbalis,
  • Qiong Li,
  • Rogier Windhorst,
  • Seth H. Cohen,
  • Rolf A. Jansen,
  • Jake Summers,
  • Scott Tompkins,
  • Simon P. Driver,
  • Aaron Robotham,
  • Jordan C. J. D’Silva,
  • Haojing Yan,
  • Dan Coe,
  • Brenda Frye,
  • Norman A. Grogin,
  • Anton M. Koekemoer,
  • Madeline A. Marshall,
  • Nor Pirzkal,
  • Russell E. Ryan Jr.,
  • W. Peter Maksym,
  • Michael J. Rutkowski,
  • Christopher N. A. Willmer,
  • Heidi B. Hammel,
  • Mario Nonino,
  • Rachana Bhatawdekar,
  • Stephen M. Wilkins,
  • Larry D. Bradley,
  • Tom Broadhurst,
  • Cheng Cheng,
  • Hervé Dole,
  • Nimish P. Hathi,
  • Adi Zitrin

DOI
https://doi.org/10.3847/1538-4357/ad2a7b
Journal volume & issue
Vol. 965, no. 2
p. 169

Abstract

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We present an analysis of the ultraviolet luminosity function (UV LF) and star formation rate density of distant galaxies (7.5 6.5) galaxies from a consistently processed set of deep, near-infrared imaging. Within an area of 180 arcmin ^2 , we identify 1046 candidate galaxies at redshifts z > 6.5 and we use this sample to study the UV LF in four redshift bins between 7.5 < z < 13.5. The measured number density of galaxies at z = 8 and z = 9 matches those of past observations undertaken by the Hubble Space Telescope (HST). Our z = 10.5 measurements lie between early James Webb Space Telescope (JWST) results and past HST results, indicating cosmic variance may be the cause of previous high density measurements. However, the number densities of UV-luminous galaxies at z = 12.5 are high compared to predictions from simulations. When examining the star formation rate density of galaxies at this period, our observations are still largely consistent with a constant star formation efficiency, are slightly lower than previous early estimations using JWST, and support galaxy driven reionization at z ≤ 8.

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