Journal Article

<i>Herschel</i>-ATLAS: VISTA VIKING near-infrared counterparts in the Phase 1 GAMA 9-h data

S. Fleuren, W. Sutherland, L. Dunne, D. J. B. Smith, S. J. Maddox, J. González-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. Michałowski, M. Negrello, E. Pascale, M. Pohlen, M. Prescott, E. E. Rigby, A. Robotham, D. Scott, P. Temi, M. A. Thompson, E. Valiante and P. van der Werf

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 3, pages 2407-2424
Published in print July 2012 | ISSN: 0035-8711
Published online June 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21048.x
Herschel-ATLAS: VISTA VIKING near-infrared counterparts in the Phase 1 GAMA 9-h data

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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 5σ detection at . We estimate the fraction of SPIRE sources with a counterpart above the magnitude limit of the VIKING survey to be Q0≈ 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 ZJ and JKs 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.

Keywords: methods: statistical; infrared: galaxies; submillimetre: galaxies

Journal Article.  13063 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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