The ionizing photon production efficiency of bright z ∼ 2 − 5 galaxies M. Castellano, D. Belfiori, L. Pentericci, A. Calabrò, S. Mascia, L. Napolitano, F. Caro, S. Charlot, J. Chevallard, E. Curtis Lake et al. (20 more) A&A, 675 (2023) A121 Published online: 07 July 2023 DOI: 10.1051/0004-6361/202346069