The ALMA REBELS Survey: the first infrared luminosity function measurement at z ∼ 7
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The ALMA REBELS Survey : the first infrared luminosity function measurement at z ∼ 7. / Barrufet, L.; Oesch, P. A.; Bouwens, R.; Inami, H.; Sommovigo, L.; Algera, H.; da Cunha, E.; Aravena, M.; Dayal, P.; Ferrara, A.; Fudamoto, Y.; Gonzalez, V.; Graziani, L.; Hygate, A. P.S.; de Looze, I.; Nanayakkara, T.; Pallottini, A.; Schneider, R.; Stefanon, M.; Topping, M.; van der Werf, P.
In: Monthly Notices of the Royal Astronomical Society, Vol. 522, No. 3, 01.07.2023, p. 3926-3934.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The ALMA REBELS Survey
T2 - the first infrared luminosity function measurement at z ∼ 7
AU - Barrufet, L.
AU - Oesch, P. A.
AU - Bouwens, R.
AU - Inami, H.
AU - Sommovigo, L.
AU - Algera, H.
AU - da Cunha, E.
AU - Aravena, M.
AU - Dayal, P.
AU - Ferrara, A.
AU - Fudamoto, Y.
AU - Gonzalez, V.
AU - Graziani, L.
AU - Hygate, A. P.S.
AU - de Looze, I.
AU - Nanayakkara, T.
AU - Pallottini, A.
AU - Schneider, R.
AU - Stefanon, M.
AU - Topping, M.
AU - van der Werf, P.
N1 - Publisher Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2023/7/1
Y1 - 2023/7/1
N2 - 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 μm 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∗/L☉ = 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 log(SFRD/M☉ 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.
AB - 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 μm 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∗/L☉ = 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 log(SFRD/M☉ 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.
KW - galaxies: high-redshift
KW - galaxies: luminosity function, mass function
KW - infrared: galaxies
U2 - 10.1093/mnras/stad1259
DO - 10.1093/mnras/stad1259
M3 - Journal article
AN - SCOPUS:85159778324
VL - 522
SP - 3926
EP - 3934
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 3
ER -
ID: 360822971