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The SCUBA-2 Cosmology Legacy Survey: 850 mu m maps, catalogues and number counts

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Title: The SCUBA-2 Cosmology Legacy Survey: 850 mu m maps, catalogues and number counts
Authors: Geach, JE
Dunlop, JS
Halpern, M
Smail, I
Van der Werf, P
Alexander, DM
Almaini, O
Aretxaga, I
Arumugam, V
Asboth, V
Banerji, M
Beanlands, J
Best, PN
Blain, AW
Birkinshaw, M
Chapin, EL
Chapman, SC
Chen, C-C
Chrysostomou, A
Clarke, C
Clements, DL
Conselice, C
Coppin, KEK
Cowley, WI
Danielson, ALR
Eales, S
Edge, AC
Farrah, D
Gibb, A
Harrison, CM
Hine, NK
Hughes, D
Ivison, RJ
Jarvis, M
Jenness, T
Jones, SF
Karim, A
Koprowski, M
Knudsen, KK
Lacey, CG
Mackenzie, T
Marsden, G
McAlpine, K
McMahon, R
Meijerink, R
Michalowski, MJ
Oliver, SJ
Page, MJ
Peacock, JA
Rigopoulou, D
Robson, EI
Roseboom, I
Rotermund, K
Scott, D
Serjeant, S
Simpson, C
Simpson, JM
Smith, DJB
Spaans, M
Stanley, F
Stevens, JA
Swinbank, AM
Targett, T
Thomson, AP
Valiante, E
Wake, DA
Webb, TMA
Willott, C
Zavala, JA
Zemcov, M
Item Type: Journal Article
Abstract: We present a catalogue of ∼3000 submillimetre sources detected (≥3.5σ) at 850 μm over ∼5 deg2 surveyed as part of the James Clerk Maxwell Telescope (JCMT) SCUBA-2 Cosmology Legacy Survey (S2CLS). This is the largest survey of its kind at 850 μm, increasing the sample size of 850 μm selected submillimetre galaxies by an order of magnitude. The wide 850 μm survey component of S2CLS covers the extragalactic fields: UKIDSS-UDS, COSMOS, Akari-NEP, Extended Groth Strip, Lockman Hole North, SSA22 and GOODS-North. The average 1σ depth of S2CLS is 1.2 mJy beam−1, approaching the SCUBA-2 850 μm confusion limit, which we determine to be σc ≈ 0.8 mJy beam−1. We measure the 850 μm number counts, reducing the Poisson errors on the differential counts to approximately 4 per cent at S850 ≈ 3 mJy. With several independent fields, we investigate field-to-field variance, finding that the number counts on 0.5°–1° scales are generally within 50 per cent of the S2CLS mean for S850 > 3 mJy, with scatter consistent with the Poisson and estimated cosmic variance uncertainties, although there is a marginal (2σ) density enhancement in GOODS-North. The observed counts are in reasonable agreement with recent phenomenological and semi-analytic models, although determining the shape of the faint-end slope (S850 < 3 mJy) remains a key test. The large solid angle of S2CLS allows us to measure the bright-end counts: at S850 > 10 mJy there are approximately 10 sources per square degree, and we detect the distinctive up-turn in the number counts indicative of the detection of local sources of 850 μm emission, and strongly lensed high-redshift galaxies. All calibrated maps and the catalogue are made publicly available.
Issue Date: 21-Feb-2017
Date of Acceptance: 19-Oct-2016
URI: http://hdl.handle.net/10044/1/61973
DOI: https://dx.doi.org/10.1093/mnras/stw2721
ISSN: 0035-8711
Publisher: Oxford University Press (OUP)
Start Page: 1789
End Page: 1806
Journal / Book Title: Monthly Notices of the Royal Astronomical Society
Volume: 465
Issue: 2
Copyright Statement: © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
catalogues
surveys
galaxies: evolution
galaxies: high-redshift
cosmology: observations
DEEP FIELD-SOUTH
SUBMILLIMETER GALAXY POPULATION
DEGREE EXTRAGALACTIC SURVEY
CLERK MAXWELL TELESCOPE
STAR-FORMING GALAXIES
SURVEY ALMA RESOLVES
14 HOUR FIELD
MOLECULAR GAS
BOLOMETER CAMERA
HIGH-REDSHIFT
0201 Astronomical And Space Sciences
Publication Status: Published
Open Access location: http://cdsads.u-strasbg.fr/cgi-bin/nph-data_query?bibcode=2016MNRAS.458.4321K&link_type=ARTICLE&db_key=AST&high=
Online Publication Date: 2016-11-10
Appears in Collections:Physics
Astrophysics



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