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Título: | z ∼ 2–9 Galaxies magnified by the Hubble frontier field clusters. II. Luminosity functions and constraints on a faint-end turnover |
Autor: | Bouwens, Rychard; Illingworth, Garth; Ellis, Richard S.; Oesch, Pascal A.; Stefanon, Mauro | Fecha de publicación: | 2022 | Editor: | IOP Publishing | Citación: | Astrophysical Journal 940(1): 55 (2022) | Resumen: | We present new determinations of the rest-UV luminosity functions (LFs) at z = 2–9 to extremely low luminosities (>−14 mag) from a sample of >2500 lensed galaxies found behind the Hubble Frontier Fields (HFF) clusters. For the first time, we present faint-end slope results from lensed samples that are fully consistent with blank-field results over the redshift range z = 2–9, while reaching to much lower luminosities than possible from the blank-field studies. Combining the deep lensed sample with the large blank-field samples allows us to set tight constraints on the faint-end slope α of the z = 2–9 UV LFs and its evolution. We find a smooth flattening in α from −2.28 ± 0.10 (z = 9) to −1.53 ± 0.03 (z = 2) with cosmic time (dα/dz = −0.11 ± 0.01), fully consistent with dark matter halo buildup. We utilize these new results to present new measurements of the evolution in the UV luminosity density ρUV brighter than −13 mag from z ∼ 9 to z ∼ 2. Accounting for the star formation rate (SFR) densities to faint luminosities implied by our LF results, we find that unobscured star formation dominates the SFR density at z ≳ 4, with obscured star formation dominant thereafter. Having shown we can quantify the faint-end slope α of the LF accurately with our lensed HFF samples, we also quantify the apparent curvature in the shape of the UV LF through a curvature parameter δ. The constraints on the curvature δ strongly rule out the presence of a turn-over brighter than −13.1 mag at z ∼ 3, −14.3 mag at z ∼ 6, and −15.5 mag at all other redshifts between z ∼ 9 and z ∼ 2. | Versión del editor: | https://doi.org/10.3847/1538-4357/ac86d1 | URI: | http://hdl.handle.net/10261/306594 | DOI: | 10.3847/1538-4357/ac86d1 | E-ISSN: | 1538-4357 |
Aparece en las colecciones: | (IFCA) Artículos |
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Faint-endurnover.pdf | 3,03 MB | Adobe PDF | Visualizar/Abrir |
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