TY - JOUR
T1 - The SCUBA-2 Cosmology Legacy Survey: the submillimetre properties of Lyman-break galaxies at z = 3-5
AU - Coppin, K.E.K.
AU - Geach, J.E.
AU - Almaini, O.
AU - Arumugam, V.
AU - Dunlop, J. S.
AU - Hartley, W. G.
AU - Ivison, R. J.
AU - Simpson, C. J.
AU - Smith, D. J. B.
AU - Swinbank, A. M.
AU - Blain, A. W.
AU - Bourne, N.
AU - Bremer, M.
AU - Conselice, C.
AU - Harrison, C. M.
AU - Mortlock, A.
AU - Chapman, S. C.
AU - Davies, L. J. M.
AU - Farrah, D.
AU - Gibb, A.
AU - Jenness, T.
AU - Karim, A.
AU - Knudsen, K.K.
AU - Ibar, E.
AU - Michałowski, M.J.
AU - Peacock, J.A.
AU - Rigopoulou, D.
AU - Robson, E. I.
AU - Scott, D.
AU - Stevens, J.
AU - Van Der Werf, P.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - 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
AB - 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
KW - galaxies: evolution - galaxies: formation
KW - galaxies: high-redshift
KW - galaxies: star formation
KW - submillimetre: galaxies
KW - ultraviolet: galaxies
U2 - 10.1093/mnras/stu2185
DO - 10.1093/mnras/stu2185
M3 - Article
SN - 0035-8711
VL - 446
SP - 1293
EP - 1304
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -