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The SCUBA-2 cosmology legacy survey : demographics of the 450-μm population.

Roseboom, I.G. and Dunlop, J.S. and Cirasuolo, M. and Geach, J.E. and Smail, I. and Halpern, M. and van der Werf, P. and Almaini, O. and Arumugam, V. and Asboth, V. and Auld, R. and Blain, A. and Bremer, M.N. and Bock, J. and Bowler, R.A.A. and Buitrago, F. and Chapin, E. and Chapman, S. and Chrysostomou, A. and Clarke, C. and Conley, A. and Coppin, K.E.K. and Danielson, A.L.R. and Farrah, D. and Glenn, J. and Hatziminaoglou, E. and Ibar, E. and Ivison, R.J. and Jenness, T. and van Kampen, E. and Karim, A. and Mackenzie, T. and Marsden, G. and Meijerink, R. and Michałowski, M.J. and Oliver, S.J. and Page, M.J. and Pearson, E. and Scott, D. and Simpson, J.M. and Smith, D.J.B. and Spaans, M. and Swinbank, A.M. and Symeonidis, M. and Targett, T. and Valiante, E. and Viero, M. and Wang, L. and Willott, C.J. and Zemcov, M. (2013) 'The SCUBA-2 cosmology legacy survey : demographics of the 450-μm population.', Monthly notices of the Royal Astronomical Society., 436 (1). pp. 430-448.

Abstract

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 arcmin2 to a typical depth of σ450 = 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〉 = 1012 ± 0.8 L⊙, 〈TD〉 = 42 ± 11 K and 〈βD〉 = 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.

Item Type:Article
Keywords:Galaxies: evolution, Galaxies: starburst, Submillimetre: galaxies.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1093/mnras/stt1577
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2013 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
Record Created:25 Jun 2014 10:35
Last Modified:03 Jul 2014 10:34

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