The ALMA REBELS Survey: the first infrared luminosity function measurement at z ∼ 7

Article Article scientifique Article The ALMA REBELS Survey: the first infrared luminosity function measurement at z ∼ 7 eng 2023-04-26 2023-07-02 author Barrufet De Soto Laia 0000-0003-1641-6185 943979 author Oesch Pascal 0000-0001-5851-6649 846811 Département d'astronomie (ASTRO) author Bouwens R. author Inami Hanae 0000-0003-4268-0393 author Sommovigo Laura 0000-0002-2906-2200 author Algera Hiddo 0000-0002-4205-9567 author da Cunha E. author Aravena M. author Dayal P. 0000-0002-3766-2265 author Ferrara A. author Fudamoto Yoshinobu 861140 author Gonzalez V. author Graziani Luca 0000-0002-9231-1505 author Hygate Alexander 0000-0002-6488-471X author de Looze I. author Nanayakkara T. author Pallottini Andrea 0000-0002-7129-5761 author Schneider Raffaella 0000-0001-9317-2888 author Stefanon M. author Topping Michael 0000-0001-8426-1141 author van der Werf P. 3926-3934 10.1093/mnras/stad1259 0035-8711 https://academic.oup.com/mnras/article/522/3/3926/7143796 <p>We present the first observational infrared luminosity function (IRLF) measurement in the Epoch of Reionization (EoR) based on a ultraviolet (UV)-selected galaxy sample with the Atacama Large Millimeter Array (ALMA) spectroscopic observations. Our analysis is based on the ALMA large program Reionization Era Bright Emission Line Survey (REBELS), which targets 42 galaxies at z = 6.4–7.7 with [C ii] 158 $\rm{\mu m}$ line scans. 16 sources exhibit dust detection, 15 of which are also spectroscopically confirmed through the [C ii] line. The infrared (IR) luminosities of the sample range from log LIR/L⊙ = 11.4 to 12.2. Using the UV luminosity function as a proxy to derive the effective volume for each of our target sources, we derive IRLF estimates, both for detections and for the full sample including IR luminosity upper limits. The resulting IRLFs are well reproduced by a Schechter function with the characteristic luminosity of $\log L_{*}/\mathrm{ L}_\odot =11.6^{+0.2}_{-0.1}$ . Our observational results are in broad agreement with the average of predicted IRLFs from simulations at z ∼ 7. Conversely, our IRLFs lie significantly below lower redshift estimates, suggesting a rapid evolution from z ∼ 4 to z ∼ 7, into the reionization epoch. The IR obscured contribution to the cosmic star formation rate density at z ∼ 7 amounts to $\mathrm{log(SFRD/{\rm M}_{\odot }\,yr^{-1}\,Mpc^{-3}) = -2.66^{+0.17}_{-0.14} }$ that is at least ∼10 per cent of UV-based estimates. We conclude that the presence of dust is already abundant in the EoR and discuss the possibility of unveiling larger samples of dusty galaxies with future ALMA and JWST observations.</p> Galaxies: high-redshift Galaxies: luminosity function, mass function Infrared: galaxies Dewey 520 Swiss National Science Foundation Galaxy Build-up at Cosmic Dawn 190079 CH Careers European Commission DELPHI: a framework to study Dark Matter and the emergence of galaxies in the epoch of reionization 717001 DELPHI EU H2020 European Commission The Interstellar Medium of High Redshift Galaxies 740120 INTERSTELLAR EU H2020 26 Département d'astronomie 12 false Monthly notices of the Royal Astronomical Society 522 3 ec2e064c-610f-47d4-a5cc-906957bfa70d Article (Published version) Public Article_scientifique_from_crossref.pdf 1321257 application/pdf CC BY-4.0 61021a6557e52347b2ba2012ab0d74ea0f0697e8626a4eb8df8c51b66ff3b816 openAccess Faculté des sciences / Département d'astronomie

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The ALMA REBELS Survey: the first infrared luminosity function measurement at z ∼ 7	Monthly notices of the Royal Astronomical Society	2023	46	125
A Panchromatic View of Galaxy Build-up in the First 2 Gyrs of Cosmic History		2020	503	269

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Fudamoto, Yoshinobu