JWST PRIMER: A new multi-field determination of the evolving galaxy UV luminosity function at redshifts 𝐳 ≃ 9-15

C. T. Donnan, R. J. McLure,J. S. Dunlop, D. J. McLeod, D. Magee, K. Z. Arellano-Córdova, L. Barrufet, R. Begley, R. A. A. Bowler, A. C. Carnall, F. Cullen, R. S. Ellis, A. Fontana, G. D. Illingworth,N. A. Grogin, M. L. Hamadouche, A. M. Koekemoer, Feng-Yuan Liu, C. Mason, P. Santini, T. M. Stanton

arxiv（2024）

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摘要

We present a new determination of the evolving galaxy UV luminosity function (LF) over the redshift range 8.58.5)>0.05) to undertake a statistical calculation of the evolving UV LF. Our new measurements span ≃4 magnitudes in UV luminosity at z=9-12.5, placing new constraints on both the shape and evolution of the LF at early times. We fit our observational data-points with a double-power law (DPL) function and explore the evolution of the DPL parameters. Our UV LF measurements yield a new estimate of the early evolution of cosmic star-formation rate density (ρ_SFR) which confirms the gradual, log-linear decline deduced from early JWST studies, at least out to z ≃ 12. Finally we show that the observed early evolution of the galaxy UV LF (and ρ_SFR) can be reproduced in a ΛCDM Universe, with no change in dust properties or star-formation efficiency required out to z ≃ 12. Instead, we show that a progressive trend towards younger stellar population ages can reproduce the observations, and we show that the typical ages required at z ≃ 8, 9, 10, and 11 all converge on a time ≃ 380-330 Myr after the Big Bang, indicative of a rapid emergence of early galaxies at z ≃ 12 - 13. This is consistent with the first indications of a steeper drop-off in the galaxy population we find beyond z ≃ 13, possibly reflecting the rapid evolution of the halo mass function at earlier times.

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