The SCUBA HAlf Degree Extragalactic Survey - III. Identification of radio and mid-infrared counterparts to submillimetre galaxies

R. J. Ivison, T. R. Greve, J. S. Dunlop, J. A. Peacock, E. Egami, Ian Smail, E. Ibar, E. Van Kampen, I. Aretxaga, T. Babbedge, A. D. Biggs, A. W. Blain, S. C. Chapman, D. L. Clements, K. Coppin, D. Farrah, M. Halpern, D. H. Hughes, M. J. Jarvis, T. JennessJ. R. Jones, A. M J Mortier, S. Oliver, C. Papovich, P. G. Pérez-González, A. Pope, S. Rawlings, George H. Rieke, M. Rowan-Robinson, R. S. Savage, D. Scott, M. Seigar, S. Serjeant, C. Simpson, J. A. Stevens, M. Vaccari, J. Wagg, C. J. Willott

Research output: Contribution to journalArticle

220 Citations (Scopus)

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, at z ∼ 2, consistent with early bursts seen in merger simulations.

Original languageEnglish (US)
Pages (from-to)199-228
Number of pages30
JournalMonthly Notices of the Royal Astronomical Society
Volume380
Issue number1
DOIs
StatePublished - Sep 2007

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radio
galaxies
color
set theory
pruning
catalogs
photometry
star formation
bursts
plots
merger
histories
trends
history
simulation

Keywords

  • Cosmology: observations
  • Early Universe
  • Galaxies: formation
  • Galaxies: starburst

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

The SCUBA HAlf Degree Extragalactic Survey - III. Identification of radio and mid-infrared counterparts to submillimetre galaxies. / Ivison, R. J.; Greve, T. R.; Dunlop, J. S.; Peacock, J. A.; Egami, E.; Smail, Ian; 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.; Pérez-González, P. G.; Pope, A.; Rawlings, S.; Rieke, George 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.

In: Monthly Notices of the Royal Astronomical Society, Vol. 380, No. 1, 09.2007, p. 199-228.

Research output: Contribution to journalArticle

Ivison, RJ, Greve, TR, Dunlop, JS, Peacock, JA, Egami, E, Smail, I, Ibar, E, Van Kampen, E, Aretxaga, I, Babbedge, T, Biggs, AD, Blain, AW, Chapman, SC, Clements, DL, Coppin, K, Farrah, D, Halpern, M, Hughes, DH, Jarvis, MJ, Jenness, T, Jones, JR, Mortier, AMJ, Oliver, S, Papovich, C, Pérez-González, PG, Pope, A, Rawlings, S, Rieke, GH, Rowan-Robinson, M, Savage, RS, Scott, D, Seigar, M, Serjeant, S, Simpson, C, Stevens, JA, Vaccari, M, Wagg, J & Willott, CJ 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, vol. 380, no. 1, pp. 199-228. https://doi.org/10.1111/j.1365-2966.2007.12044.x
Ivison, R. J. ; Greve, T. R. ; Dunlop, J. S. ; Peacock, J. A. ; Egami, E. ; Smail, Ian ; 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. ; Pérez-González, P. G. ; Pope, A. ; Rawlings, S. ; Rieke, George 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. / The SCUBA HAlf Degree Extragalactic Survey - III. Identification of radio and mid-infrared counterparts to submillimetre galaxies. In: Monthly Notices of the Royal Astronomical Society. 2007 ; Vol. 380, No. 1. pp. 199-228.
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T1 - The SCUBA HAlf Degree Extragalactic Survey - III. Identification of radio and mid-infrared counterparts to submillimetre galaxies

AU - Ivison, R. J.

AU - Greve, T. R.

AU - Dunlop, J. S.

AU - Peacock, J. A.

AU - Egami, E.

AU - Smail, Ian

AU - Ibar, E.

AU - Van Kampen, E.

AU - Aretxaga, I.

AU - Babbedge, T.

AU - Biggs, A. D.

AU - Blain, A. W.

AU - Chapman, S. C.

AU - Clements, D. L.

AU - Coppin, K.

AU - Farrah, D.

AU - Halpern, M.

AU - Hughes, D. H.

AU - Jarvis, M. J.

AU - Jenness, T.

AU - Jones, J. R.

AU - Mortier, A. M J

AU - Oliver, S.

AU - Papovich, C.

AU - Pérez-González, P. G.

AU - Pope, A.

AU - Rawlings, S.

AU - Rieke, George H.

AU - Rowan-Robinson, M.

AU - Savage, R. S.

AU - Scott, D.

AU - Seigar, M.

AU - Serjeant, S.

AU - Simpson, C.

AU - Stevens, J. A.

AU - Vaccari, M.

AU - Wagg, J.

AU - Willott, C. J.

PY - 2007/9

Y1 - 2007/9

N2 - 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, at z ∼ 2, consistent with early bursts seen in merger simulations.

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KW - Cosmology: observations

KW - Early Universe

KW - Galaxies: formation

KW - Galaxies: starburst

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