The SCUBA-2 Cosmology Legacy Survey: the submillimetre properties of Lyman-break galaxies at z = 3-5

K.E.K. Coppin, J.E. Geach, O. Almaini, V. Arumugam, J. S. Dunlop, W. G. Hartley, R. J. Ivison, C. J. Simpson, D. J. B. Smith, A. M. Swinbank, A. W. Blain, N. Bourne, M. Bremer, C. Conselice, C. M. Harrison, A. Mortlock, S. C. Chapman, L. J. M. Davies, D. Farrah, A. GibbT. Jenness, A. Karim, K.K. Knudsen, E. Ibar, M.J. Michałowski, J.A. Peacock, D. Rigopoulou, E. I. Robson, D. Scott, J. Stevens, P. Van Der Werf

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


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 ≈ 1029 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
Original languageEnglish
Pages (from-to)1293-1304
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 1 Jan 2015


Dive into the research topics of 'The SCUBA-2 Cosmology Legacy Survey: the submillimetre properties of Lyman-break galaxies at z = 3-5'. Together they form a unique fingerprint.

Cite this