Jack Birkin jack.birkin@durham.ac.uk
PGR Student Doctor of Philosophy
Jack Birkin jack.birkin@durham.ac.uk
PGR Student Doctor of Philosophy
Axel Weiss
JL Wardlow
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
Professor Mark Swinbank a.m.swinbank@durham.ac.uk
Professor
Ugne Dudzeviciute ugne.dudzeviciute2@durham.ac.uk
PGR Student Doctor of Philosophy
Fang Xia An
Y Ao
SC Chapman
Chian-Chou Chen
E da Cunha
H Dannerbauer
B Gullberg
JA Hodge
S Ikarashi
RJ Ivison
Y Matsuda
SM Stach
F Walter
W-H Wang
P van der Werf
We have used ALMA and NOEMA to study the molecular gas reservoirs in 61 ALMA-identified submillimetre galaxies (SMGs) in the COSMOS, UDS, and ECDFS fields. We detect 12CO (Jup= 2–5) emission lines in 50 sources, and [C I](3P1 − 3P0) emission in eight, at z= 1.2–4.8 and with a median redshift of 2.9 ± 0.2. By supplementing our data with literature sources, we construct a statistical CO spectral line energy distribution and find that the 12CO line luminosities in SMGs peak at Jup ∼ 6, consistent with similar studies. We also test the correlations of the CO, [C I], and dust as tracers of the gas mass, finding the three to correlate well, although the CO and dust mass as estimated from the 3-mm continuum are preferable. We estimate that SMGs lie mostly on or just above the star-forming main sequence, with a median gas depletion timescale, tdep = Mgas/SFR, of 210 ± 40 Myr for our sample. Additionally, tdep declines with redshift across z ∼ 1–5, while the molecular gas fraction, μgas = Mgas/M*, increases across the same redshift range. Finally, we demonstrate that the distribution of total baryonic mass and dynamical line width, Mbaryon–σ, for our SMGs is consistent with that followed by early-type galaxies in the Coma cluster, providing strong support to the suggestion that SMGs are progenitors of massive local spheroidal galaxies. On the basis of this, we suggest that the SMG populations above and below an 870-μm flux limit of S870 ∼ 5 mJy may correspond to the division between slow and fast rotators seen in local early-type galaxies.
Birkin, J. E., Weiss, A., Wardlow, J., Smail, I., Swinbank, A., Dudzevičiūtė, U., …van der Werf, P. (2021). An ALMA/NOEMA survey of the molecular gas properties of high-redshift star-forming galaxies. Monthly Notices of the Royal Astronomical Society, 501(3), 3926-3950. https://doi.org/10.1093/mnras/staa3862
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 4, 2021 |
Online Publication Date | Dec 17, 2021 |
Publication Date | 2021-03 |
Deposit Date | Apr 8, 2021 |
Publicly Available Date | Apr 8, 2021 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 501 |
Issue | 3 |
Pages | 3926-3950 |
DOI | https://doi.org/10.1093/mnras/staa3862 |
Public URL | https://durham-repository.worktribe.com/output/1277909 |
Published Journal Article
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020. The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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