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The Herschel Bright Sources (HerBS): sample definition and SCUBA-2 observations

Bakx, Tom, Eales, Stephen, Negrello, Mattia, Smith, Matthew, Valiante, Elisabetta, Holland, W. S., Baes, M., Bourne, N., Clements, D. L., Dannerbauer, H., De Zotti, G., Dunne, Loretta, Dye, S., Furlanetto, C., Ivison, R. J., Maddox, Steve, Marchetti, L., Michałowski, M. J., Omont, A., Oteo, I., Wardlow, J. L., Werf, P. van der and Yang, C. 2018. The Herschel Bright Sources (HerBS): sample definition and SCUBA-2 observations. Monthly Notices of the Royal Astronomical Society 473 (2) , pp. 1751-1773. 10.1093/mnras/stx2267

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Abstract

We present the Herschel Bright Sources (HerBS) sample, a sample of bright, high-redshift Herschel sources detected in the 616.4 square degree H-ATLAS survey. The HerBS sample contains 209 galaxies, selected with a 500 µm flux density greater than 80 mJy and an estimated redshift greater than 2. The sample consists of a combination of HyLIRGs and lensed ULIRGs during the epoch of peak cosmic star formation. In this paper, we present SCUBA-2 observations at 850 µm of 189 galaxies of the HerBS sample, 152 of these sources were detected. We fit a spectral template to the Herschel-SPIRE and 850 µm SCUBA-2 flux densities of 22 sources with spectroscopically determined redshifts, using a two-component modified blackbody spectrum as a template. We find a cold- and hot-dust temperature of 21.29+1.35 −1.66 K and 45.80+2.88 −3.48 K, a cold-to-hot dust mass ratio of 26.62+5.61 −6.74 and a β of 1.83+0.14 −0.28. The poor quality of the fit suggests that the sample of galaxies is too diverse to be explained by our simple model. Comparison of our sample to a galaxy evolution model indicates that the fraction of lenses is high. Out of the 152 SCUBA-2 detected galaxies, the model predicts 128.4 ± 2.1 of those galaxies to be lensed (84.5%). The SPIRE 500 µm flux suggests that out of all 209 HerBS sources, we expect 158.1 ± 1.7 lensed sources, giving a total lensing fraction of 76 per cent.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 15 September 2017
Date of Acceptance: 4 September 2017
Last Modified: 25 Feb 2019 23:25
URI: http://orca.cf.ac.uk/id/eprint/104690

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