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

Duivenvoorden, S, Oliver, S, Scudder, J M, Greenslade, J, Reichers, D A, Wilkins, S M, Buat, V, Chapman, S C, Clements, D L, Cooray, A, Coppin, K E K, Dannerbauer, H, De Zotti, G, Dunlop, J S, Eales, S A, Efstathiou, A, Farrah, D, Geach, J E, Holland, W S, Hurley, P D, Ivison, R J, Marchetti, L, Petitpas, G, Sargent, M T, Scott, D, Symeonidis, M, Vaccari, M, Vieira, J D, Wang, L, Wardlow, J and Zemcov, M (2018) Red, redder, reddest: SCUBA-2 imaging of colour-selected Herschel sources. Monthly Notices Of The Royal Astronomical Society, sty691. ISSN 0035-8711

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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 Multi-tiered Extragalactic Survey (HerMES) Large Mode Survey, covering 274 deg2. We detected 87 per cent with a signal-to-noise ratio > 3 at 850 m. We introduce a new method for incorporating the confusion noise in our spectral energy distribution fitting by sampling correlated flux density uctuations 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 (<(z-zspec)=(1+zspec)> = 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 should include examples of galaxies with the highest star formation rates in the Universe (>> 103 M☉yr-1).

Item Type: Article
Keywords: Infrared: galaxies; galaxies: high-redshift; galaxies: starburst
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
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Depositing User: Billy Wichaidit
Date Deposited: 07 Mar 2018 15:27
Last Modified: 21 May 2018 09:49
URI: http://sro.sussex.ac.uk/id/eprint/74188

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Project NameSussex Project NumberFunderFunder Ref
Astrophysics and Cosmology - Sussex Consolidated GrantG1291STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/L000652/1