The ALMA REBELS survey: [O iii]88μm line scans of UV-bright z ⪆ 7.6 galaxies

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Van Leeuwen, IF orcid iconORCID: 0009-0005-6803-6805, Bouwens, RJ, Hodge, JA, Van Der Werf, PP, Algera, HSB orcid iconORCID: 0000-0002-4205-9567, Schouws, S, Aravena, M, Bowler, RAA orcid iconORCID: 0000-0003-3917-1678, Dayal, P orcid iconORCID: 0000-0001-8460-1564, Ferrara, A, Fisher, R orcid iconORCID: 0009-0008-3946-0502, Fudamoto, Y orcid iconORCID: 0000-0001-7440-8832, Gulis, C, Herard-Demanche, T orcid iconORCID: 0000-0003-2164-7949, Inami, H orcid iconORCID: 0000-0003-4268-0393, De Looze, I orcid iconORCID: 0000-0001-9419-6355, Pallottini, A orcid iconORCID: 0000-0002-7129-5761, Smit, R orcid iconORCID: 0000-0001-8034-7802, Sommovigo, L orcid iconORCID: 0000-0002-2906-2200 and Stefanon, M (2025) The ALMA REBELS survey: [O iii]88μm line scans of UV-bright z ⪆ 7.6 galaxies. Monthly Notices of the Royal Astronomical Society, 542 (2). pp. 1388-1402. ISSN 0035-8711

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Abstract

We present the [O iii] spectral scan results from the ALMA Large Program REBELS (Reionization Era Bright Emission Line Survey). The generally high luminosity of [O iii] and ALMA's Band 7 efficiency motivated its use for line scans of REBELS targets at z>8. Spectral scans of four sources covered 326.4-373.0 GHz (-9.39), reaching [O iii] luminosities of () for a full width at half maximum (FWHM) of 400 km s. No credible lines are detected for the four targets. For REBELS-04, the non-detection is unexpected given the coverage of the redshift likelihood distribution and its estimated star formation rate of 40. Possible explanations for the faint [O iii] emission (assuming an FWHM of 100 km s) include high interstellar medium densities (n_{\text{crit}} \approx 510\ \text{cm}^{-3}$]]>) and low ionization parameters (). For REBELS-37, a subsequent detection of [C ii] () confirmed it lay outside our scan range. For REBELS-11 and REBELS-13, it remains unclear if the non-detection is due to the depth of the line scan or redshift coverage. REBELS-04 and REBELS-37 show significant () dust continuum emission in Band 7. If the photometric redshift of REBELS-04 is accurate, i.e. or accounting for additional neutral hydrogen in the circumgalactic medium, REBELS-04 would constitute the most distant dust-detected galaxy identified with ALMA to date. Additional Band 6 dust observations of REBELS-37 constrain the shape of the far-IR spectral energy distribution, ruling out cold dust temperatures (K) at. Further insight into these galaxies will require spectroscopic redshifts and deeper multiband dust observations.

Item Type: Article
Uncontrolled Keywords: 5101 Astronomical Sciences; 51 Physical Sciences; 7 Affordable and Clean Energy; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics; 5101 Astronomical sciences; 5107 Particle and high energy physics; 5109 Space sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date of acceptance: 30 July 2025
Date of first compliant Open Access: 12 June 2026
Date Deposited: 12 Jun 2026 14:15
Last Modified: 12 Jun 2026 14:15
DOI or ID number: 10.1093/mnras/staf1287
URI: https://researchonline.ljmu.ac.uk/id/eprint/28832
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