University of Hertfordshire

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  • 906140

    Accepted author manuscript, 3 MB, PDF document

  • S. Fleuren
  • W. Sutherland
  • L. Dunne
  • S. J. Maddox
  • J. Gonzalez-Nuevo
  • J. Findlay
  • R. Auld
  • M. Baes
  • N. A. Bond
  • D. G. Bonfield
  • N. Bourne
  • A. Cooray
  • S. Buttiglione
  • A. Cava
  • A. Dariush
  • G. De Zotti
  • S. P. Driver
  • S. Dye
  • S. Eales
  • J. Fritz
  • M. L. P. Gunawardhana
  • R. Hopwood
  • E. Ibar
  • R. J. Ivison
  • M.J. Jarvis
  • L. Kelvin
  • A. Lapi
  • J. Liske
  • M. J. Michalowski
  • M. Negrello
  • E. Pascale
  • M. Pohlen
  • M. Prescott
  • E. E. Rigby
  • A. Robotham
  • D. Scott
  • P. Temi
  • E. Valiante
  • P. van der Werf
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Original languageEnglish
Number of pages18
Pages (from-to)2407-2424
JournalMonthly Notices of the Royal Astronomical Society
Journal publication dateJul 2012
Volume423
Issue3
Early online date10 May 2012
DOIs
Publication statusPublished - Jul 2012

Abstract

We identify near-infrared Ks-band counterparts to Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) submillimetre (submm) sources, using a preliminary object catalogue from the VISTA Kilo-degree Infrared Galaxy (VIKING) survey. The submm sources are selected from the H-ATLAS Phase 1 catalogue of the Galaxy and Mass Assembly 9-h field, which includes all objects detected at 250, 350 or with the instrument. We apply and discuss a likelihood ratio method for VIKING candidates within a search radius of 10 arcsec of the 22 000 SPIRE sources with a 5s detection at . We estimate the fraction of SPIRE sources with a counterpart above the magnitude limit of the VIKING survey to be Q0 similar to 0.73. We find that 11 294 (51 per cent) of the SPIRE sources have a best VIKING counterpart with a reliability R= 0.8, and the false identification rate of these is estimated to be 4.2 per cent. We expect to miss 5 per cent of true VIKING counterparts. There is evidence from Z-J and J-Ks colours that the reliable counterparts to SPIRE galaxies are marginally redder than the field population. We obtain photometric redshifts for 68 per cent of all (non-stellar) VIKING candidates with a median redshift of . We have spectroscopic redshifts for 3147 (28 per cent) of the reliable counterparts from existing redshift surveys. Comparing to the results of the optical identifications supplied with the Phase 1 catalogue, we find that the use of medium-deep near-infrared data improves the identification rate of reliable counterparts from 36 to 51 per cent.

ID: 961423