What question did this study set out to answer?

This research aims to refine the understanding of the UV luminosity function and star-formation rate density in the early universe, focusing on redshifts greater than 12.

May 18, 2026Open Access

A search for the first galaxies across >0.6 deg² of JWST imaging: new evidence for a rapid decline in star-formation activity at z>12

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Authors

DMD. J. McLeod JDJ. S. Dunlop RMR. J. McLure

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Implication

New evidence shows a rapid decline in star-formation activity among early galaxies, suggesting important shifts in cosmic history.

Key Points

This research aims to refine the understanding of the UV luminosity function and star-formation rate density in the early universe, focusing on redshifts greater than 12.
Analyzed JWST NIRCam imaging over an area of >0.6 deg² with >150 independent sight-lines.
Measured the evolving UV luminosity function and inferred star-formation rate density from observed galaxy candidates at extreme redshifts.
Utilized both log-linear and piece-wise model approaches to assess changes in star-formation rates over time.
Observed a significant decline in the star-formation rate density at z=15.5, lower than predictions from simpler models.
Found a steeper decline in star-formation rates for z>12 compared to rates for z<12, approximately 4 times steeper.
Results align with theoretical models suggesting early galaxy evolution and star-formation efficiency adjustments.

Cite This Study

McLeod et al. (2026) studied this question.

synapsesocial.com/papers/6a0aad2a5ba8ef6d83b70a28 https://doi.org/10.13016/m2e7hg-oopz

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A search for the first galaxies across >0.6 deg² of JWST imaging: new evidence for a rapid decline in star-formation activity at z>12

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Key Points

Cite This Study

A search for the first galaxies across >0.6 deg² of JWST imaging: new evidence for a rapid decline in star-formation activity at z>12

Discussion

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Implication

Key Points

Cite This Study

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