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Red, redder, reddest: SCUBA-2 imaging of colour-selected Herschel sources

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  • S. Duivenvoorden
  • S. Oliver
  • J. M. Scudder
  • J. Greenslade
  • D. A. Riechers
  • S. M. Wilkins
  • V. Buat
  • S. C. Chapman
  • D. L. Clements
  • A. Cooray
  • K. E. K. Coppin
  • H. Dannerbauer
  • G. De Zotti
  • J. S. Dunlop
  • S. A. Eales
  • A. Efstathiou
  • D. Farrah
  • J. E. Geach
  • W. S. Holland
  • P. D. Hurley
  • R. J. Ivison
  • L. Marchetti
  • G. Petitpas
  • M. T. Sargent
  • D. Scott
  • M. Symeonidis
  • M. Vaccari
  • J. D. Vieira
  • L. Wang
  • M. Zemcov
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<mark>Journal publication date</mark>1/06/2018
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number1
Volume477
Number of pages21
Pages (from-to)1099-1119
Publication StatusPublished
Early online date15/03/18
<mark>Original language</mark>English

Abstract

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).

Bibliographic note

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.