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An ALMA survey of the SCUBA-2 CLS UDS field : physical properties of 707 sub-millimetre galaxies.

Dudzevičiūtė, U. and Smail, I. and Swinbank, A.M. and Stach, S.M. and Almaini, O. and da Cunha, E. and An, Fang Xia and Arumugam, V. and Birkin, J. and Blain, A.W. and Chapman, S.C. and Chen, C-C. and Conselice, C.J. and Coppin, K.E.K. and Dunlop, J.S. and Farrah, D. and Geach, J.E. and Gullberg, B. and Hartley, W.G. and Hodge, J.A. and Ivison, R.J. and Maltby, D.T. and Scott, D. and Simpson, C.J. and Simpson, J.M. and Thomson, A.P. and Walter, F. and Wardlow, J.L. and Weiss, A. and van der Werf, P. (2020) 'An ALMA survey of the SCUBA-2 CLS UDS field : physical properties of 707 sub-millimetre galaxies.', Monthly notices of the Royal Astronomical Society., 494 (3). pp. 3828-3860.

Abstract

We analyse the physical properties of a large, homogeneously selected sample of ALMA-located sub-millimetre galaxies (SMGs). This survey, AS2UDS, identified 707 SMGs across the ∼ 1 deg2 field, including ∼ 17 per cent which are undetected at K ≳ 25.7 mag. We interpret their UV-to-radio data using MAGPHYS and determine a median redshift of z = 2.61±0.08 (1-σ range of z = 1.8–3.4) with just ∼ 6 per cent at z > 4. Our survey provides a sample of massive dusty galaxies at z ≳ 1, with median dust and stellar masses of Md = (6.8±0.3) × 108 M⊙ (thus, gas masses of ∼ 1011 M⊙) and M* = (1.26±0.05) × 1011 M⊙. We find no evolution in dust temperature at a constant far-infrared luminosity across z ∼ 1.5–4. The gas mass function of our sample increases to z ∼ 2–3 and then declines at z > 3. The space density and masses of SMGs suggest that almost all galaxies with M* ≳ 3 × 1011 M⊙ have passed through an SMG-like phase. The redshift distribution is well fit by a model combining evolution of the gas fraction in halos with the growth of halo mass past a critical threshold of Mh ∼ 6 × 1012 M⊙, thus SMGs may represent the highly efficient collapse of gas-rich massive halos. We show that SMGs are broadly consistent with simple homologous systems in the far-infrared, consistent with a centrally illuminated starburst. Our study provides strong support for an evolutionary link between the active, gas-rich SMG population at z > 1 and the formation of massive, bulge-dominated galaxies across the history of the Universe.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1093/mnras/staa769
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s) . Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:11 March 2020
Date deposited:03 April 2020
Date of first online publication:02 April 2020
Date first made open access:03 April 2020

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