Stuart M Stach
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
Authors
Ugne Dudzeviciute ugne.dudzeviciute2@durham.ac.uk
PGR Student Doctor of Philosophy
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
Professor Mark Swinbank a.m.swinbank@durham.ac.uk
Professor
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.
Citation
Stach, S. M., Dudzevičiūtė, U., Smail, I., Swinbank, A., Geach, J., Simpson, J., …Werf, P. V. D. (2019). An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: Source catalogue and properties. Monthly Notices of the Royal Astronomical Society, 487(4), 4648-4668. https://doi.org/10.1093/mnras/stz1536
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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