What type of study is this?

This is a Quantitative Study study.

October 18, 2025Open Access

A census of quiescent galaxies across 0. 5 < z < 8 with JWST/MIRI: Mass-dependent number density evolution of quiescent galaxies in the early Universe

Puntos clave

The study finds a rapid decrease in high-mass quiescent galaxies from a density of 1×10^{-5} at z=3-4 to negligible levels at z > 5.
Nearly all point-like quiescent galaxy candidates are inaccurately estimated due to photometric redshift issues, affecting density calculations.
Using deep NIRCam and MIRI imaging allows for more robust stellar mass measurements and improved identification of quiescent galaxies.
Comparisons with hydrodynamical models show a significant underestimation of high-mass quiescent galaxy densities at z > 4.

Resumen

JWST observations reveal numerous quiescent galaxies (QGs) at high redshift (z 4-8), challenging models of early galaxy formation and quenching. Accurate number density estimates are crucial for comparison with theory but remain uncertain. We systematically study QGs at 0. 5 10. 3) decreases rapidly from n = 110^-5~Mpc^-3 at z=3-4 to n=210^-6~Mpc^-3 at z = 4-5, becoming negligible (n 10^-6~Mpc^-3) at z > 5. Conversely, low-mass QGs (9 4 are likely temporarily quenched, akin to mini-quenched galaxies. Comparison with major hydrodynamical and semi-analytical models shows most underestimate high-mass QG densities at z>4 and fail to reproduce the constant low-mass QG density at z>5.

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