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Title: The SCUBA HAlf degree extragalactic survey - III. Identification of radio and mid-infrared counterparts to submillimetre galaxies
Authors: Ivison, R. J.
Greve, T. R.
Dunlop, J. S.
Peacock, J. A.
Egami, E.
Smail, I.
Ibar, E.
van Kampen E.
Aretxaga, I.
Babbedge, T.
Biggs, A. D.
Blain, A. W.
Chapman, S. C.
Clements, D. L.
Coppin, K.
Farrah, D.
Halpern, M.
Hughes, D. H.
Jarvis, M. J.
Jenness, T.
Jones, J. R.
Mortier, A. M. J.
Oliver, S.
Papovich, C.
Perez-Gonzalez, P. G.
Pope, A.
Rawlings, S.
Rieke, G. H.
Rowan-Robinson, M.
Savage, R. S.
Scott, D.
Seigar, M.
Serjeant, S.
Simpson, C.
Stevens, J. A.
Vaccari, M.
Wagg, J.
Willott, C. J.
First Published: 1-Sep-2007
Publisher: Royal Astronomical Society (RAS)
Citation: Monthly Notices of the Royal Astronomical Society, 2007, 380 (1), pp. 199-228
Abstract: Determining an accurate position for a submillimetre (submm) galaxy (SMG) is the crucial step that enables us to move from the basic properties of an SMG sample – source counts and 2D clustering – to an assessment of their detailed, multiwavelength properties, their contribution to the history of cosmic star formation and their links with present-day galaxy populations. In this paper, we identify robust radio and/or infrared (IR) counterparts, and hence accurate positions, for over two-thirds of the SCUBA HAlf-Degree Extragalactic Survey (SHADES) Source Catalogue, presenting optical, 24-μm and radio images of each SMG. Observed trends in identification rate have given no strong rationale for pruning the sample. Uncertainties in submm position are found to be consistent with theoretical expectations, with no evidence for significant additional sources of error. Employing the submm/radio redshift indicator, via a parametrization appropriate for radio-identified SMGs with spectroscopic redshifts, yields a median redshift of 2.8 for the radio-identified subset of SHADES, somewhat higher than the median spectroscopic redshift. We present a diagnostic colour–colour plot, exploiting Spitzer photometry, in which we identify regions commensurate with SMGs at very high redshift. Finally, we find that significantly more SMGs have multiple robust counterparts than would be expected by chance, indicative of physical associations. These multiple systems are most common amongst the brightest SMGs and are typically separated by 2–6 arcsec, Graphic at z∼ 2, consistent with early bursts seen in merger simulations.
DOI Link: 10.1111/j.1365-2966.2007.12044.x
ISSN: 0035-8711
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2007 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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