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

Duivenvoorden, S. and Oliver, S. and Scudder, J. M. and Greenslade, J. and Riechers, D. A. and Wilkins, S. M. and Buat, V. and Chapman, S. C. and Clements, D. L. and Cooray, A. and Coppin, K. E. K. and Dannerbauer, H. and De Zotti, G. and Dunlop, J. S. and Eales, S. A. and Efstathiou, A. and Farrah, D. and Geach, J. E. and Holland, W. S. and Hurley, P. D. and Ivison, R. J. and Marchetti, L. and Petitpas, G. and Sargent, M. T. and Scott, D. and Symeonidis, M. and Vaccari, M. and Vieira, J. D. and Wang, L. and Wardlow, J. and Zemcov, M. (2018) Red, redder, reddest : SCUBA-2 imaging of colour-selected Herschel sources. Monthly Notices of the Royal Astronomical Society, 477 (1). pp. 1099-1119. ISSN 0035-8711

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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).

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Journal Article
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Monthly Notices of the Royal Astronomical Society
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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.
Uncontrolled Keywords:
?? galaxies: high-redshiftgalaxies: starburstinfrared: galaxiessubmillimetre: galaxiesastronomy and astrophysicsspace and planetary science ??
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26 Oct 2018 10:22
Last Modified:
02 Jan 2024 00:20