<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 K_s-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 Z−J and J−K_s 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.