An ALMA/NOEMA survey of the molecular gas properties of high-redshift star-forming galaxies
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Date
2021
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Publisher
Oxford University Press
Abstract
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.
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Keywords
Galaxies: evolution, Galaxies: Star formation, Submillimetre: galaxies
Citation
An, F.X. et al. (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