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The SCUBA half-degree extragalactic survey - II. Submillimetre maps, catalogue and number counts.

Coppin, K. and Chapin, E.L. and Mortier, A.M.J. and Scott, S.E. and Borys, C. and Dunlop, J.S. and Halpern, M. and Hughes, D.H. and Pope, A. and Scott, D. and Serjeant, S. and Wagg, J. and Alexander, D.M. and Almaini, O. and Aretxaga, I. and Babbedge, T. and Best, P.N. and Blain, A. and Chapman, S. and Clements, D.L. and Crawford, M. and Dunne, L. and Eales, S.A. and Edge, A.C. and Farrah, D. and Gaztañaga, E. and Gear, W.K. and Granato, G.L. and Greve, T.R. and Fox, M. and Ivison, R.J. and Jarvis, M.J. and Jenness, T. and Lacey, C. and Lepage, K. and Mann, R.G. and Marsden, G. and Martinez-Sansigre, A. and Oliver, S. and Page, M.J. and Peacock, J.A. and Pearson, C.P. and Percival, W.J. and Priddey, R.S. and Rawlings, S. and Rowan-Robinson, M. and Savage, R.S. and Seigar, M. and Sekiguchi, K. and Silva, L. and Simpson, C. and Smail, I. and Stevens, J.A. and Takagi, T. and Vaccari, M. and van Kampen, E. and Willott, C.J. (2006) 'The SCUBA half-degree extragalactic survey - II. Submillimetre maps, catalogue and number counts.', Monthly notices of the Royal Astronomical Society., 372 (4). pp. 1621-1652.


We present maps, source catalogue and number counts of the largest, most complete and unbiased extragalactic submillimetre survey: the 850-μm SCUBA Half-Degree Extragalactic Survey (SHADES). Using the Submillimetre Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT), SHADES mapped two separate regions of sky: the Subaru/XMM–Newton Deep Field (SXDF) and the Lockman Hole East (LH). Encompassing 93 per cent of the overall acquired data (i.e. data taken up to 2004 February 1), these SCUBA maps cover 720 arcmin2 with a rms noise level of about 2 mJy and have uncovered >100 submillimetre galaxies. In order to ensure the utmost robustness of the resulting source catalogue, data reduction was independently carried out by four subgroups within the SHADES team, providing an unprecedented degree of reliability with respect to other SCUBA catalogues available from the literature. Individual source lists from the four groups were combined to produce a robust 120-object SHADES catalogue; an invaluable resource for follow-up campaigns aiming to study the properties of a complete and consistent sample of submillimetre galaxies. For the first time, we present deboosted flux densities for each submillimetre galaxy found in a large survey. Extensive simulations and tests were performed separately by each group in order to confirm the robustness of the source candidates and to evaluate the effects of false detections, completeness and flux density boosting. Corrections for these effects were then applied to the data to derive the submillimetre galaxy source counts. SHADES has a high enough number of detected sources that meaningful differential counts can be estimated, unlike most submillimetre surveys which have to consider integral counts. We present differential and integral source number counts and find that the differential counts are better fit with a broken power law or a Schechter function than with a single power law; the SHADES data alone significantly show that a break is required at several mJy, although the precise position of the break is not well constrained. We also find that a 850-μm survey complete down to 2 mJy would resolve 20–30 per cent of the far-infrared background into point sources.

Item Type:Article
Keywords:Surveys, Galaxies: evolution, Galaxies: formation, Galaxies: starburst, Cosmology: observations, Submillimetre.
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2006 The Author. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:20 February 2015
Date of first online publication:November 2006
Date first made open access:No date available

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