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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  Q  0 ≈ 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.

Herschel ‐ATLAS: VISTA VIKING near‐infrared counterparts in the Phase 1 GAMA 9‐h data ★