학술논문
JWST PRIMER: A new multi-field determination of the evolving galaxy UV luminosity function at redshifts $\mathbf{z \simeq 9-15}$
Document Type
Working Paper
Author
Donnan, C. T.; McLure, R. J.; Dunlop, J. S.; McLeod, D. J.; Magee, D.; Arellano-Córdova, K. Z.; Barrufet, L.; Begley, R.; Bowler, R. A. A.; Carnall, A. C.; Cullen, F.; Ellis, R. S.; Fontana, A.; Illingworth, G. D.; Grogin, N. A.; Hamadouche, M. L.; Koekemoer, A. M.; Liu, F. -Y.; Mason, C.; Santini, P.; Stanton, T. M.
Source
Subject
Language
Abstract
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 UV LF. Our new measurements span $\simeq4$ magnitudes in UV luminosity at $z=9-12.5$, placing new constraints on both the shape and evolution of the LF at early times. Our measurements yield a new estimate of the early evolution of cosmic star-formation rate density ($\rho_{\rm{SFR}}$) confirming the gradual decline deduced from early JWST studies, at least out to $z \simeq 12$. Finally we show that the observed early evolution of the galaxy UV LF (and $\rho_{\rm{SFR}}$) can be reproduced in a ${\rm \Lambda}$CDM Universe, with no change in dust properties or star-formation efficiency required out to $z \simeq 12$. Instead, a progressive trend towards younger stellar population ages can reproduce the observations, and the typical ages required at $z \simeq$ 8, 9, 10, and 11 all converge on $\simeq 380-330$ Myr after the Big Bang, indicative of a rapid emergence of early galaxies at $z \simeq 12 - 13$. This is consistent with the first indications of a steeper drop-off in $\rho_{\rm{SFR}}$ we find beyond $z \simeq 13$, possibly reflecting the rapid evolution of the halo mass function at earlier times.
Comment: 15 pages, 9 figures, submitted to MNRAS. v2: updated in response to reviewer comments
Comment: 15 pages, 9 figures, submitted to MNRAS. v2: updated in response to reviewer comments