The ALMA REBELS survey: the dust-obscured cosmic star formation rate density at redshift 7

Hiddo S.B. Algera, Hanae Inami, Pascal A. Oesch, Laura Sommovigo, Rychard J. Bouwens, Michael W. Topping, Sander Schouws, Mauro Stefanon, Daniel P. Stark, Manuel Aravena, Laia Barrufet, Elisabete da Cunha, Pratika Dayal, Ryan Endsley, Andrea Ferrara, Yoshinobu Fudamoto, Valentino Gonzalez, Luca Graziani, Jacqueline A. Hodge, Alexander P.S. HygateIlse de Looze, Themiya Nanayakkara, Raffaella Schneider, Paul P. van der Werf

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Cosmic dust is an essential component shaping both the evolution of galaxies and their observational signatures. How quickly dust builds up in the early Universe remains an open question that requires deep observations at (sub-)millimetre wavelengths to resolve. Here, we use Atacama Large Millimeter Array observations of 45 galaxies from the Reionization Era Bright Emission Line Survey (REBELS) and its pilot programs, designed to target [C II] and dust emission in UV-selected galaxies at z ∼ 7, to investigate the dust content of high-redshift galaxies through a stacking analysis. We find that the typical fraction of obscured star formation fobs = SFRIR/SFRUV+IR depends on stellar mass, similar to what is observed at lower redshift, and ranges from fobs ≈ 0.3 − 0.6 for galaxies with log10(M*/M) = 9.4–10.4. We further adopt the z ∼ 7 stellar mass function from the literature to extract the obscured cosmic star formation rate density (SFRD) from the REBELS survey. Our results suggest only a modest decrease in the SFRD between 3 ≲ z ≲ 7, with dust-obscured star formation still contributing ∼30 per cent at z ∼ 7. While we extensively discuss potential caveats, our analysis highlights the continued importance of dust-obscured star formation even well into the epoch of reionization.

Original languageEnglish (US)
Pages (from-to)6142-6157
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume518
Issue number4
DOIs
StatePublished - Feb 1 2023

Keywords

  • galaxies: evolution
  • galaxies: high-redshift
  • submillimetre: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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