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The SCUBA-2 cosmology legacy survey : blank-field number counts of 450-μm-selected galaxies and their contribution to the cosmic infrared background.

Geach, J. E. and Chapin, E. L. and Coppin, K. E. K. and Dunlop, J. S. and Halpern, M. and Smail, Ian and van der Werf, P. and Serjeant, S. and Farrah, D. and Roseboom, I. and Targett, T. and Arumugam, V. and Asboth, V. and Blain, A. and Chrysostomou, A. and Clarke, C. and Ivison, R. J. and Jones, S. L. and Karim, A. and Mackenzie, T. and Meijerink, R. and Michałowski, M. J. and Scott, Douglas and Simpson, J. M. and Swinbank, A. M. and Alexander, D. M. and Almaini, O. and Aretxaga, I. and Best, P. and Chapman, S. and Clements, D. L. and Conselice, C. and Danielson, A. L. R. and Eales, S. and Edge, A. C. and Gibb, A. G. and Hughes, D. and Jenness, T. and Knudsen, K. K. and Lacey, Cedric G. and Marsden, G. and McMahon, R. and Oliver, S. J. and Page, M. J. and Peacock, J. A. and Rigopoulou, D. and Robson, E. I. and Spaans, M. and Stevens, J. and Webb, T. M. A. and Willott, C. and Wilson, C. D. and Zemcov, M. (2013) 'The SCUBA-2 cosmology legacy survey : blank-field number counts of 450-μm-selected galaxies and their contribution to the cosmic infrared background.', Monthly Notices of the Royal Astronomical Society., 432 (1). pp. 53-61.

Abstract

The first deep blank-field 450 μm map (1σ ≈ 1.3 mJy) from the Submillimetre Common-User Bolometer Array-2 SCUBA-2 Cosmology Legacy Survey (S2CLS), conducted with the James Clerk Maxwell Telescope (JCMT) is presented. Our map covers 140 arcmin2 of the Cosmological Evolution Survey field, in the footprint of the Hubble Space Telescope (HST) Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey. Using 60 submillimetre galaxies detected at ≥3.75σ, we evaluate the number counts of 450-μm-selected galaxies with flux densities S450 > 5 mJy. The 8 arcsec JCMT beam and high sensitivity of SCUBA-2 now make it possible to directly resolve a larger fraction of the cosmic infrared background (CIB, peaking at λ ˜ 200 μm) into the individual galaxies responsible for its emission than has previously been possible at this wavelength. At S450 > 5 mJy, we resolve (7.4 ± 0.7) × 10-2 MJy sr-1 of the CIB at 450 μm (equivalent to 16 ± 7 per cent of the absolute brightness measured by the Cosmic Background Explorer at this wavelength) into point sources. A further ˜40 per cent of the CIB can be recovered through a statistical stack of 24 μm emitters in this field, indicating that the majority (≈60 per cent) of the CIB at 450 μm is emitted by galaxies with S450 > 2 mJy. The average redshift of 450 μm emitters identified with an optical/near-infrared counterpart is estimated to be <z> = 1.3, implying that the galaxies in the sample are in the ultraluminous class (L_IR≈ 1.1× 10^{12} {L_{⊙}}). If the galaxies contributing to the statistical stack lie at similar redshifts, then the majority of the CIB at 450 μm is emitted by galaxies in the luminous infrared galaxy (LIRG) class with LIR > 3.6 × 1011 L⊙.

Item Type:Article
Keywords:Galaxies, High-redshift, Cosmology, Observations, Submillimetre.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1093/mnras/stt352
Publisher statement:This article has been published in the Monthly Notices of the Royal Astronomical Society © 2013 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:20 November 2013
Date of first online publication:2013
Date first made open access:No date available

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