Duivenvoorden, S;
Oliver, S;
Scudder, JM;
Greenslade, J;
Riechers, DA;
Wilkins, SM;
Buat, V;
... Zemcov, M; + view all
(2018)
Red, redder, reddest: SCUBA-2 imaging of colour-selected Herschel sources.
Monthly Notices of the Royal Astronomical Society
, 477
(1)
pp. 1099-1119.
10.1093/mnras/sty691.
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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 Multitiered Extragalactic Survey (HerMES) LargeMode 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 ($(z−zspec)/(1+zspec)$ = 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 includes examples of galaxies with the highest star formation rates in the Universe ($103 M$ yr−1).
| Type: | Article |
|---|---|
| Title: | Red, redder, reddest: SCUBA-2 imaging of colour-selected Herschel sources |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/sty691 |
| Publisher version: | https://doi.org/10.1093/mnras/sty691 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, galaxies: high-redshift, galaxies: starburst, Infrared: galaxies, submillimetre: galaxies, SPECTRAL ENERGY-DISTRIBUTIONS, DEGREE EXTRAGALACTIC SURVEY, STAR-FORMATION HISTORY, DEEP FIELD-SOUTH, COSMOLOGY LEGACY SURVEY, SUBMILLIMETER GALAXIES, HIGH-REDSHIFT, MU-M, NUMBER COUNTS, CROSS-CORRELATION |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10068472 |
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