Life beyond 30: Probing the −20 < M UV < −17 Luminosity Function at 8 < z < 13 with the NIRCam Parallel Field of the MIRI Deep Survey

[摘要] We present the ultraviolet luminosity function and an estimate of the cosmic star formation rate density at 8 8 galaxy candidates based on their dropout nature in the F115W and/or F150W filters, a high probability for their photometric redshifts, estimated with three different codes, being atz> 8, good fits based onχ ² calculations, and predominant solutions compared toz< 8 alternatives. We find mild evolution in the luminosity function fromz∼ 13 toz∼ 8, i.e., only a small increase in the average number density of ∼0.2 dex, while the faint-end slope and absolute magnitude of the knee remain approximately constant, with valuesα= − 2.2 ± 0.1, andM ^* = − 20.8 ± 0.2 mag. Comparing our results with the predictions of state-of-the-art galaxy evolution models, we find two main results: (1) a slower increase with time in the cosmic star formation rate density compared to a steeper rise predicted by models; (2) nearly a factor of 10 higher star formation activity concentrated in scales around 2 kpc in galaxies with stellar masses ∼10⁸ M _⊙ during the first 350 Myr of the universe,z∼ 12, with models matching better the luminosity density observational estimations ∼150 Myr later, byz∼ 9.