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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Red, redder, reddest
T2 - SCUBA-2 imaging of colour-selected Herschel sources
AU - Duivenvoorden, S.
AU - Oliver, S.
AU - Scudder, J. M.
AU - Greenslade, J.
AU - Riechers, D. A.
AU - Wilkins, S. M.
AU - Buat, V.
AU - Chapman, S. C.
AU - Clements, D. L.
AU - Cooray, A.
AU - Coppin, K. E. K.
AU - Dannerbauer, H.
AU - De Zotti, G.
AU - Dunlop, J. S.
AU - Eales, S. A.
AU - Efstathiou, A.
AU - Farrah, D.
AU - Geach, J. E.
AU - Holland, W. S.
AU - Hurley, P. D.
AU - Ivison, R. J.
AU - Marchetti, L.
AU - Petitpas, G.
AU - Sargent, M. T.
AU - Scott, D.
AU - Symeonidis, M.
AU - Vaccari, M.
AU - Vieira, J. D.
AU - Wang, L.
AU - Wardlow, J.
AU - Zemcov, M.
N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
PY - 2018/6/1
Y1 - 2018/6/1
N2 - High-redshift, luminous, dusty star-forming galaxies (DSFGs) constrain the extremity of galaxy formation theories. The most extreme are discovered through follow-up on candidates in large area surveys. Here, we present extensive 850 μm SCUBA-2 follow-up observations of 188 red DSFG candidates from the Herschel Multitiered Extragalactic Survey (HerMES) Large Mode Survey, covering 274 deg2. We detected 87 per cent with a signal-to-noise ratio >3 at 850 μm. We introduce a new method for incorporating the confusion noise in our spectral energy distribution fitting by sampling correlated flux density fluctuations from a confusion limited map. The new 850 μm data provide a better constraint on the photometric redshifts of the candidates, with photometric redshift errors decreasing from σz/(1 + z) ≈ 0.21 to 0.15. Comparison spectroscopic redshifts also found little bias ( = 0.08). The mean photometric redshift is found to be 3.6 with a dispersion of 0.4 and we identify 21 DSFGs with a high probability of lying at z > 4. After simulating our selection effects we find number counts are consistent with phenomenological galaxy evolution models. There is a statistically significant excess of WISE-1 and SDSS sources near our red galaxies, giving a strong indication that lensing may explain some of the apparently extreme objects. Nevertheless, our sample includes examples of galaxies with the highest star formation rates in the Universe (≫103 M⊙ yr-1).
AB - High-redshift, luminous, dusty star-forming galaxies (DSFGs) constrain the extremity of galaxy formation theories. The most extreme are discovered through follow-up on candidates in large area surveys. Here, we present extensive 850 μm SCUBA-2 follow-up observations of 188 red DSFG candidates from the Herschel Multitiered Extragalactic Survey (HerMES) Large Mode Survey, covering 274 deg2. We detected 87 per cent with a signal-to-noise ratio >3 at 850 μm. We introduce a new method for incorporating the confusion noise in our spectral energy distribution fitting by sampling correlated flux density fluctuations from a confusion limited map. The new 850 μm data provide a better constraint on the photometric redshifts of the candidates, with photometric redshift errors decreasing from σz/(1 + z) ≈ 0.21 to 0.15. Comparison spectroscopic redshifts also found little bias ( = 0.08). The mean photometric redshift is found to be 3.6 with a dispersion of 0.4 and we identify 21 DSFGs with a high probability of lying at z > 4. After simulating our selection effects we find number counts are consistent with phenomenological galaxy evolution models. There is a statistically significant excess of WISE-1 and SDSS sources near our red galaxies, giving a strong indication that lensing may explain some of the apparently extreme objects. Nevertheless, our sample includes examples of galaxies with the highest star formation rates in the Universe (≫103 M⊙ yr-1).
KW - galaxies: high-redshift
KW - galaxies: starburst
KW - Infrared: galaxies
KW - submillimetre: galaxies
U2 - 10.1093/mnras/sty691
DO - 10.1093/mnras/sty691
M3 - Journal article
VL - 477
SP - 1099
EP - 1119
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 1
ER -