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This research aims to reconcile JWST observations of luminous galaxies at high redshifts with ΛCDM halo models.

February 12, 2026The Astrophysical JournalOpen Access

Matching JWST Ultraviolet Luminosity Functions with Refined ΛCDM Halo Models

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This research aims to reconcile JWST observations of luminous galaxies at high redshifts with ΛCDM halo models.
Revisiting dark matter halo formation physics
Employing refined halo mass functions incorporating angular momentum and dynamical friction
Using a semiempirical framework linking halo mass to ultraviolet luminosity
Performing normalized reduced χ2 analysis for statistical verification
Demonstrated enhancement in halo abundance at redshift z ≳ 7 compared to conventional models
The DP2 model aligns well with observed UV luminosity functions from z = 7 to 14 under moderate star formation efficiencies
The ST model necessitates implausibly high efficiencies for a good fit
Identified oversimplified gravitational collapse treatments as a source for discrepancies with JWST observations

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Analysis shows a refined halo model enhances UV luminosity in high-redshift galaxies, suggesting improved understanding of early structures.

Fakhry et al. (2026) studied this question.

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Analysis shows a refined halo model enhances UV luminosity in high-redshift galaxies, suggesting improved understanding of early structures.