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The ALMA REBELS survey: the dust content of <i>z</i> ∼ 7 lyman break galaxies

Dayal, P, Ferrara, A, Sommovigo, L, Bouwens, R, Oesch, PA, Smit, R, Gonzalez, V, Schouws, S, Stefanon, M, Kobayashi, C, Bremer, J, Algera, HSB, Aravena, M, Bowler, RAA, da Cunha, E, Fudamoto, Y, Graziani, L, Hodge, J, Inami, H, De Looze, I , Pallottini, A, Riechers, D, Schneider, R, Stark, D and Endsley, R The ALMA REBELS survey: the dust content of <i>z</i> ∼ 7 lyman break galaxies. Monthly Notices of the Royal Astronomical Society. ISSN 0035-8711 (Accepted)

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We include a fully coupled treatment of metal and dust enrichment into the DELPHI semi-analytic model of galaxy formation to explain the dust content of 13 Lyman Break Galaxies (LBGs) detected by the Atacama Large millimetre Array (ALMA) REBELS Large Program at z ≃ 7. We find that the galaxy dust mass, Md, is regulated by the combination of SNII dust production, astration, shock destruction, and ejection in outflows; grain growth (with a standard timescale τ0 = 30 Myr) plays a negligible role. The model predicts a dust-to-stellar mass ratio of ∼0.07−0.1 per cent and a UV-to-total star formation rate relation such that log(ψUV) = −0.05 [log(ψ)]2 + 0.86 log(ψ) − 0.05 (implying that 55-80 per cent of the star formation is obscured) for REBELS galaxies with stellar mass M∗=109−10M⊙⁠. This relation reconciles the intrinsic UV luminosity of LBGs with their observed luminosity function at z = 7. However, 2 out of the 13 systems show dust-to-stellar mass ratios (⁠∼0.94−1.1 per cent⁠) that are up to 18 × larger than expected from the fiducial relation. Due to the physical coupling between dust and metal enrichment, even decreasing τ0 to very low values (0.3 Myr) only increases the dust-to-stellar mass ratio by a factor ∼2. Given that grain growth is not a viable explanation for such high observed ratios of the dust-to-stellar mass, we propose alternative solutions.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record P Dayal, A Ferrara, L Sommovigo, R Bouwens, P A Oesch, R Smit, V Gonzalez, S Schouws, M Stefanon, C Kobayashi, J Bremer, H S B Algera, M Aravena, R A A Bowler, E da Cunha, Y Fudamoto, L Graziani, J Hodge, H Inami, I De Looze, A Pallottini, D Riechers, R Schneider, D Stark, R Endsley, The ALMA REBELS survey: the dust content of z ∼ 7 lyman break galaxies, Monthly Notices of the Royal Astronomical Society, 2022;, stac537, is available online at: https://doi.org/10.1093/mnras/stac537
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
Date Deposited: 08 Mar 2022 15:18
Last Modified: 08 Mar 2022 15:30
DOI or Identification number: 10.1093/mnras/stac537
URI: https://researchonline.ljmu.ac.uk/id/eprint/16468

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