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

Bakx, Tom, Eales, Stephen ORCID: https://orcid.org/0000-0002-7394-426X, Negrello, Mattia ORCID: https://orcid.org/0000-0002-7925-7663, Smith, Matthew ORCID: https://orcid.org/0000-0002-3532-6970, Valiante, Elisabetta, Holland, W. S., Baes, M., Bourne, N., Clements, D. L., Dannerbauer, H., De Zotti, G., Dunne, Loretta ORCID: https://orcid.org/0000-0001-9880-2543, Dye, S., Furlanetto, C., Ivison, R. J., Maddox, Steve ORCID: https://orcid.org/0000-0001-5549-195X, 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
Additional Information:	Erratum recorded at http://orca.cf.ac.uk/134926
Publisher:	Oxford University Press
ISSN:	0035-8711
Date of First Compliant Deposit:	15 September 2017
Date of Acceptance:	4 September 2017
Last Modified:	14 Nov 2024 01:00
URI:	https://orca.cardiff.ac.uk/id/eprint/104690

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