JWST PRIMER: A new multi-field determination of the evolving galaxy UV luminosity function at redshifts $\mathbf{z \simeq 9-15}$
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| 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. |
| author_facet | 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. |
| contents | We present a new determination of the evolving galaxy UV luminosity function (LF) over the redshift range $8.5<z<15.5$ using a combination of several major Cycle-1 JWST imaging programmes - PRIMER, JADES and NGDEEP. This multi-field approach yields a total of $\simeq370$ sq. arcmin of JWST/NIRCam imaging, reaching (5-$σ$) depths of $\simeq30$ AB mag in the deepest regions. We select a sample of 2548 galaxies with a significant probability of lying at high redshift ($p(z>8.5)>0.05$) 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 ($ρ_{\rm{SFR}}$) 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 $ρ_{\rm{SFR}}$) can be reproduced in a ${\rm Λ}$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 $ρ_{\rm{SFR}}$ we find beyond $z \simeq 13$, possibly reflecting the rapid evolution of the halo mass function at earlier times. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_03171 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | JWST PRIMER: A new multi-field determination of the evolving galaxy UV luminosity function at redshifts $\mathbf{z \simeq 9-15}$ 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. Astrophysics of Galaxies We present a new determination of the evolving galaxy UV luminosity function (LF) over the redshift range $8.5<z<15.5$ using a combination of several major Cycle-1 JWST imaging programmes - PRIMER, JADES and NGDEEP. This multi-field approach yields a total of $\simeq370$ sq. arcmin of JWST/NIRCam imaging, reaching (5-$σ$) depths of $\simeq30$ AB mag in the deepest regions. We select a sample of 2548 galaxies with a significant probability of lying at high redshift ($p(z>8.5)>0.05$) 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 ($ρ_{\rm{SFR}}$) 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 $ρ_{\rm{SFR}}$) can be reproduced in a ${\rm Λ}$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 $ρ_{\rm{SFR}}$ we find beyond $z \simeq 13$, possibly reflecting the rapid evolution of the halo mass function at earlier times. |
| title | JWST PRIMER: A new multi-field determination of the evolving galaxy UV luminosity function at redshifts $\mathbf{z \simeq 9-15}$ |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2403.03171 |