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

Geach, J.E.; Dunlop, J.S.; Halpern, M.; Smail, I.; van der Werf, P.; Alexander, D.M.; Almaini, O.; Aretxaga, I.; Arumugam, V.; Asboth, V.; Banerji, M.; Beanlands, J.; Best, P.N.; Blain, A.W.; Birkinshaw, M.; Chapin, E.L.; Chapman, S.C.; Chen, C.-C.; Chrysostomou, A.; Clarke, C.; Clements, D.L.; Conselice, C.; Coppin, K.E.K.; Cowley, W.I.; Danielson, A.L.R.; Eales, S.; Edge, A.C.; Farrah, D.; Gibb, A.; Harrison, C.M.; Hine, N.K.; Hughes, D.; Ivison, R.J.; Jarvis, M.; Jenness, T.; Jones, S.F.; Karim, A.; Koprowski, M.; Knudsen, K.K.; Lacey, C.G.; Mackenzie, T.; Marsden, G.; McAlpine, K.; McMahon, R.; Meijerink, R.; Michałowski, M.J.; Oliver, S.J.; Page, M.J.; Peacock, J.A.; Rigopoulou, D.; Robson, E.I.; Roseboom, I.; Rotermund, K.; Scott, D.; Serjeant, S.; Simpson, C.; Simpson, J.M.; Smith, D.J.B.; Spaans, M.; Stanley, F.; Stevens, J.A.; Swinbank, A.M.; Targett, T.; Thomson, A.P.; Valiante, E.; Wake, D.A.; Webb, T.M.A.; Willott, C.; Zavala, J.A.; Zemcov, M.

The SCUBA-2 Cosmology Legacy Survey: 850 μm maps, catalogues and number counts Thumbnail


J.E. Geach

J.S. Dunlop

M. Halpern

P. van der Werf

O. Almaini

I. Aretxaga

V. Arumugam

V. Asboth

M. Banerji

J. Beanlands

P.N. Best

A.W. Blain

M. Birkinshaw

E.L. Chapin

S.C. Chapman

C.-C. Chen

A. Chrysostomou

C. Clarke

D.L. Clements

C. Conselice

K.E.K. Coppin

W.I. Cowley

A.L.R. Danielson

S. Eales

D. Farrah

A. Gibb

C.M. Harrison

N.K. Hine

D. Hughes

R.J. Ivison

M. Jarvis

T. Jenness

S.F. Jones

A. Karim

M. Koprowski

K.K. Knudsen

T. Mackenzie

G. Marsden

K. McAlpine

R. McMahon

R. Meijerink

M.J. Michałowski

S.J. Oliver

M.J. Page

J.A. Peacock

D. Rigopoulou

E.I. Robson

I. Roseboom

K. Rotermund

D. Scott

S. Serjeant

C. Simpson

J.M. Simpson

D.J.B. Smith

M. Spaans

F. Stanley

J.A. Stevens

T. Targett

A.P. Thomson

E. Valiante

D.A. Wake

T.M.A. Webb

C. Willott

J.A. Zavala

M. Zemcov


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.

Journal Article Type Article
Acceptance Date Oct 19, 2016
Online Publication Date Nov 10, 2016
Publication Date Feb 1, 2017
Deposit Date Feb 27, 2017
Publicly Available Date Mar 2, 2017
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 465
Issue 2
Pages 1789-1806
Public URL
Related Public URLs


Published Journal Article (7.7 Mb)

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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