Herschel-ATLAS : VISTA VIKING near-infrared counterparts in the Phase 1 GAMA 9-h data
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.
Item Type | Article |
---|---|
Date Deposited | 26 Jul 2024 16:31 |
Last Modified | 26 Jul 2024 16:31 |
Explore Further
Read more research from the creator(s):
- Fleuren, S.
- Sutherland, W.
- Dunne, L.
- Smith, Daniel
- Maddox, S. J.
- Gonzalez-Nuevo, J.
- Findlay, J.
- Auld, R.
- Baes, M.
- Bond, N. A.
- Bonfield, D. G.
- Bourne, N.
- Cooray, A.
- Buttiglione, S.
- Cava, A.
- Dariush, A.
- De Zotti, G.
- Driver, S. P.
- Dye, S.
- Eales, S.
- Fritz, J.
- Gunawardhana, M. L. P.
- Hopwood, R.
- Ibar, E.
- Ivison, R. J.
- Jarvis, M.J.
- Kelvin, L.
- Lapi, A.
- Liske, J.
- Michalowski, M. J.
- Negrello, M.
- Pascale, E.
- Pohlen, M.
- Prescott, M.
- Rigby, E. E.
- Robotham, A.
- Scott, D.
- Temi, P.
- Thompson, Mark
- Valiante, E.
- van der Werf, P.
Find work associated with the faculties and division(s):