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An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: Source catalogue and properties

Stach, Stuart M; Dudzevičiūtė, U; Smail, Ian; Swinbank, AM; Geach, JE; Simpson, JM; An, Fang Xia; Almaini, Omar; Arumugam, Vinodiran; Blain, AW; Chapman, SC; Chen, Chian-Chou; Conselice, CJ; Cooke, EA; Coppin, KEK; da Cunha, E; Dunlop, JS; Farrah, Duncan; Gullberg, B; Hodge, JA; Ivison, R; Kocevski, Dale D; Michałowski, MJ; Miyaji, Takamitsu; Scott, Douglas; Thomson, AP; Wardlow, JL; Weiss, Axel; Werf, P van der

An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: Source catalogue and properties Thumbnail


Authors

Stuart M Stach

JE Geach

JM Simpson

Fang Xia An

Omar Almaini

Vinodiran Arumugam

AW Blain

SC Chapman

Chian-Chou Chen

CJ Conselice

EA Cooke

KEK Coppin

E da Cunha

JS Dunlop

Duncan Farrah

B Gullberg

JA Hodge

R Ivison

Dale D Kocevski

MJ Michałowski

Takamitsu Miyaji

Douglas Scott

AP Thomson

JL Wardlow

Axel Weiss

P van der Werf



Abstract

We present the catalogue and basic properties of sources in AS2UDS, an 870-μm continuum survey with the Atacama Large Millimetre/sub-millimetre Array (ALMA) of 716 single-dish sub-millimetre sources detected in the UKIDSS/UDS field by the SCUBA-2 Cosmology Legacy Survey. In our sensitive ALMA follow-up observations we detect 708 sub-millimetre galaxies (SMGs) at > 4.3σ significance across the ∼ 1-degree diameter field. We combine our precise ALMA positions with the extensive multi-wavelength coverage in the UDS field which yields spectral energy distributions for our SMGs and a median redshift of zphot = 2.61±0.09. This large sample reveals a statistically significant trend of increasing sub-millimetre flux with redshift suggestive of galaxy downsizing. 101 ALMA maps do not show a > 4.3σ SMG, but we demonstrate from stacking Herschel SPIRE observations at these positions, that the vast majority of these blank maps correspond to real single-dish sub-millimetre sources. We further show that these blank maps contain an excess of galaxies at zphot = 1.5–4 compared to random fields, similar to the redshift range of the ALMA-detected SMGs. In addition, we combine X-ray and mid-infrared active galaxy nuclei activity (AGN) indicators to yield a likely range for the AGN fraction of 8–28 % in our sample. Finally, we compare the redshifts of this population of high-redshift, strongly star-forming galaxies with the inferred formation redshifts of massive, passive galaxies being found out to z ∼ 2, finding reasonable agreement – in support of an evolutionary connection between these two classes of massive galaxy.

Journal Article Type Article
Acceptance Date May 28, 2019
Online Publication Date Jun 6, 2019
Publication Date Aug 31, 2019
Deposit Date Jun 6, 2019
Publicly Available Date Jun 6, 2019
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 487
Issue 4
Pages 4648-4668
DOI https://doi.org/10.1093/mnras/stz1536
Public URL https://durham-repository.worktribe.com/output/1295048

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© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.






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