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Published November 21, 2013 | Supplemental Material + Published + Submitted
Journal Article Open

The SCUBA-2 Cosmology Legacy Survey: demographics of the 450-μm population


We investigate the multiwavelength properties of a sample of 450-μm-selected sources from the SCUBA-2 Cosmology Legacy Survey. A total of 69 sources were identified above 4σ in deep SCUBA-2 450-μm observations overlapping the UDS and COSMOS fields and covering 210 arcmin^2 to a typical depth of σ_450 = 1.5 mJy. Reliable cross-identifications are found for 58 sources (84 per cent) in Spitzer and Hubble Space Telescope WFC3/IR data. The photometric redshift distribution (dN/dz) of 450-μm-selected sources is presented, showing a broad peak in the redshift range 1 < z < 3 and a median of z = 1.4. Combining the SCUBA-2 photometry with Herschel SPIRE data from HerMES, the submm spectral energy distribution (SED) is examined via the use of modified blackbody fits, yielding aggregate values for the IR luminosity, dust temperature and emissivity of 〈LIR〉 = 10^(12 ± 0.8) L_⊙, 〈T_D〉 = 42 ± 11 K and 〈β_D〉 = 1.6 ± 0.5, respectively. The relationship between these SED parameters and the physical properties of galaxies is investigated, revealing correlations between TD and LIR and between βD and both stellar mass and effective radius. The connection between the star formation rate (SFR) and stellar mass is explored, with 24 per cent of 450-μm sources found to be 'starbursts', i.e. displaying anomalously high specific SFRs. However, both the number density and observed properties of these 'starburst' galaxies are found to be consistent with the population of normal star-forming galaxies.

Additional Information

© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 August 20. Received 2013 August 9; in original form 2013 May 15. First published online: September 28, 2013. We thank the anonymous referee for suggestions which greatly enhanced this work. We also thank B. Sidthorpe and W. Holland for many useful discussions related to the reduction and analysis of SCUBA-2 imaging. JSD acknowledges the support of the Royal Society via a Wolfson Research Merit award and the support of the European Research Council via the award of an Advanced Grant. IRS acknowledges support from STFC (ST/I001573/1), a Leverhulme Fellowship, the ERC Advanced Investigator programme DUSTYGAL and a Royal Society/Wolfson Merit Award. LW and SJO were supported by the Science and Technology Facilities Council (grant number ST/I000976/1). Many thanks to the JCMT telescope operators: J.Hoge, J. Wouterloot and W.Montgomerie, without whom these observations would not be possible. The James Clerk Maxwell Telescope is operated by the Joint Astronomy Centre on behalf of the Science and Technology Facilities Council of the United Kingdom, the National Research Council of Canada and (until 2013 March 31) the Netherlands Organisation for Scientific Research. Additional funds for the construction of SCUBA-2 were provided by the Canada Foundation for Innovation. SPIRE has been developed by a consortium of institutes led by Cardiff Univ. (UK), including Univ. Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, Univ. Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, Univ. Sussex (UK); and Caltech, JPL, NHSC, Univ. Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC, UKSA (UK); and NASA (USA). All the data used in this analysis are available through the JCMT, Herschel, HST and Spitzer archives.

Attached Files

Published - MNRAS-2013-Roseboom-430-48.pdf

Submitted - 1308.4443.pdf

Supplemental Material - 3409207_Supplementary_Data.zip

Supplemental Material - tablea1_cosmos.txt

Supplemental Material - tablea2_uds.txt

Supplemental Material - tablea3_seds.txt


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