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An ALMA survey of the SCUBA-2 CLS UDS field: Physical properties of 707 Sub-millimetre Galaxies

Dudzevičiūtė, U; Smail, Ian; Swinbank, AM; Stach, SM; Almaini, O; da Cunha, E; An, Fang Xia; Arumugam, V; Birkin, J; Blain, AW; Chapman, SC; Chen, C-C; Conselice, CJ; Coppin, KEK; Dunlop, JS; Farrah, D; Geach, JE; Gullberg, B; Hartley, WG; Hodge, JA; Ivison, RJ; Maltby, DT; Scott, D; Simpson, CJ; Simpson, JM; Thomson, AP; Walter, F; Wardlow, JL; Weiss, A; van der Werf, P

An ALMA survey of the SCUBA-2 CLS UDS field: Physical properties of 707 Sub-millimetre Galaxies Thumbnail


Authors

SM Stach

O Almaini

E da Cunha

Fang Xia An

V Arumugam

J Birkin

AW Blain

SC Chapman

C-C Chen

CJ Conselice

KEK Coppin

JS Dunlop

D Farrah

JE Geach

B Gullberg

WG Hartley

JA Hodge

RJ Ivison

DT Maltby

D Scott

CJ Simpson

JM Simpson

AP Thomson

F Walter

JL Wardlow

A Weiss

P van der Werf



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.

Citation

Dudzevičiūtė, U., Smail, I., Swinbank, A., Stach, S., Almaini, O., da Cunha, E., …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), 3828-3860. https://doi.org/10.1093/mnras/staa769

Journal Article Type Article
Acceptance Date Mar 11, 2020
Online Publication Date Apr 2, 2020
Publication Date May 31, 2020
Deposit Date Apr 3, 2020
Publicly Available Date Apr 3, 2020
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 494
Issue 3
Pages 3828-3860
DOI https://doi.org/10.1093/mnras/staa769
Public URL https://durham-repository.worktribe.com/output/1273875

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Copyright 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.






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