Ivison, R. J. and Greve, T. R. and Dunlop, J. S. and Peacock, J. A. and Egami, E. and Smail, Ian and Ibar, E. and van Kampen, E. and Aretxaga, I. and Babbedge, T. and Biggs, A. D. and Blain, A. W. and Chapman, S. C. and Clements, D. L. and Coppin, K. and Farrah, D. and Halpern, M. and Hughes, D. H. and Jarvis, M. J. and Jenness, T. and Jones, J. R. and Mortier, A. M. J. and Oliver, S. and Papovich, C. and Pérez-González , P. G. and Pope, A. and Rawlings, S. and Rieke, G. H. and Rowan-Robinson, M. and Savage, R. S. and Scott, D. and Seigar, M. and Serjeant, S. and Simpson, C. and Stevens, J. A. and Vaccari, M. and Wagg, J. and Willott, C. J. (2007) The SCUBA HAlf Degree Extragalactic Survey – III. Identification of radio and mid-infrared counterparts to submillimetre galaxies. Monthly Notices of the Royal Astronomical Society, 380 (1). pp. 199-228. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20100420-110615215
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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, ~15–50/ sin i kpc at z∼ 2, consistent with early bursts seen in merger simulations.
|Additional Information:||© 2007 The Authors. Journal compilation © 2007 RAS. Accepted 2007 May 30; Received 2007 May 30; in original form 2007 February 20. AWB acknowledges support from the Alfred P. Sloan Foundation and the Research Corporation. IS acknowledges support from the Royal Society. CS and SR acknowledge financial support from the PPARC. IA and DHH acknowledge support from CONACYT grants 39548-F and 39953-F.|
|Subject Keywords:||galaxies: formation; galaxies: starburst; cosmology: observations; early Universe|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||20 Apr 2010 20:50|
|Last Modified:||26 Dec 2012 11:59|
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