Semi-analytic forecasts for JWST – I. UV luminosity functions at z = 4–10

L. Y.Aaron Yung*, Rachel S. Somerville, Steven L. Finkelstein, Gergö Popping, Romeel Davé

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

In anticipation of the upcoming deployment of the James Webb Space Telescope (JWST), we present high-redshift predictions by the well-established Santa Cruz semi-analytic model. We update the models by re-calibrating them after adopting cosmological parameters consistent with recent constraints from Planck. We provide predictions for rest-frame UV luminosity functions for galaxy populations over a wide range of MUV from ∼−6 to ∼−24 between z = 4–10. In addition, we present the corresponding predictions for observed-frame galaxy number counts in different redshift bins in the full set of NIRCam filters. We provide predictions of the quantitative effect on these observables of varying the physical recipes implemented in the models, such as the molecular gas depletion time (star formation efficiency), scalings or the scalings of outflow rates driven by stars, and supernovae with galaxy circular velocity. Based on these results, we discuss what may be learned about the physical processes that shape galaxy formation from JWST observations of galaxy number densities at different intrinsic luminosities. All data tables for the results presented in this work are available at

Original languageEnglish
Pages (from-to)2983-3006
Number of pages24
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date29 Nov 2018
Publication statusPublished - 1 Mar 2019

Keywords / Materials (for Non-textual outputs)

  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: high-redshifts
  • Galaxies: star formation
  • Galaxies: statistics


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