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Title: The SCUBA-2 Cosmology Legacy Survey: the submillimetre properties of Lyman-break galaxies at z=3-5
Authors: Coppin, K. E. K.
Geach, J. E.
Almaini, O.
Arumugam, V.
Dunlop, J. S.
Hartley, W. G.
Ivison, R. J.
Simpson, C. J.
Smith, D. J. B.
Swinbank, A. M.
Blain, Andrew W.
Bourne, N.
Bremer, M.
Conselice, C.
Harrison, C. M.
Mortlock, A.
Chapman, S. C.
Davies, L. J. M.
Farrah, D.
Gibb, A.
Jenness, T.
Karim, A.
Knudsen, K. K.
Ibar, E.
Michalowski, M. J.
Peacock, J. A.
Rigopoulou, D.
Robson, I.
Scott, D.
Stevens, J.
van der Werf, P. P.
First Published: 11-Jan-2015
Publisher: Oxford University Press on behalf of the Royal Astronomical Society.
Citation: Monthly Notices of the Royal Astronomical Society, 2015, 446 (2), pp. 1293-1304
Abstract: We present detections at 850 μm of the Lyman-break galaxy (LBG) population at z ≈ 3, 4, and 5 using data from the Submillimetre Common User Bolometer Array 2 Cosmology Legacy Survey in the United Kingdom Infrared Deep Sky Survey ‘Ultra Deep Survey’ field. We employ stacking to probe beneath the survey limit, measuring the average 850 μm flux density of LBGs at z ≈ 3, 4, and 5 with typical ultraviolet luminosities of L1700 ≈ 10[superscript 29] erg s−1 Hz−1. We measure 850 μm flux densities of (0.25 ± 0.03), (0.41 ± 0.06), and (0.88 ± 0.23) mJy, respectively, finding that they contribute at most 20 per cent to the cosmic far-infrared (IR) background at 850 μm. Fitting an appropriate range of spectral energy distributions to the z ∼ 3, 4, and 5 LBG stacked 24–850 μm fluxes, we derive IR luminosities of L8-1000 μm ≈ 3.2, 5.5, and 11.0 × 1011 L⊙ [and star formation rates (SFRs) of ≈50–200 M⊙ yr−1], respectively. We find that the evolution in the IR luminosity density of LBGs is broadly consistent with model predictions for the expected contribution of luminous-to-ultraluminous IR galaxies at these epochs. We observe a positive correlation between stellar mass and IR luminosity and confirm that, for a fixed mass, the reddest LBGs (UV slope β → 0) are redder due to dust extinction, with SFR(IR)/SFR(UV) increasing by about an order of magnitude over −2 < β < 0 with SFR(IR)/SFR(UV) ∼ 20 for the reddest LBGs. Furthermore, the most massive LBGs tend to have higher obscured-to-unobscured ratios, hinting at a variation in the obscuration properties across the mass range.
DOI Link: 10.1093/mnras/stu2185
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website 04/01/2016.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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