What question did this study set out to answer?

The study aims to analyze the faint end of the luminosity function of galaxies at redshifts z ∼ 7-9.

February 24, 2026

A GLIMPSE into the very faint end of the Hbeta+[O iii] lambda lambda 4960; 5008 luminosity function at z ∼ 7 - 9 behind Abell S1063

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This analysis constrains the faint end of the luminosity function in galaxies, suggesting limited contributions to cosmic re-ionization.

The study aims to analyze the faint end of the luminosity function of galaxies at redshifts z ∼ 7-9.
Utilized the GLIMPSE JWST/NIRCam survey for deep observations
Conducted spectral energy distribution fitting on 164 lensed galaxies
Measured combined flux to construct the emission line luminosity function
Explored several models to explain observed differences in luminosity functions
Converted luminosity function to calculate ionising photon-production rates.
Derived a faint-end slope of the luminosity function at α=-1.78 for z=8-9, which is flatter than the UV luminosity function
Galaxies with luminosities ≥ 10^39 contribute significantly to the ionising photon budget (31%-90% at z=7-8)
Found that very faint galaxies have a negligible effect on the total ionising photon-production rate
Consistent results with previous findings on cosmic star formation rate density.

Korber et al. (2026) studied this question.

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