| Reliable, but incomplete, point source catalogue derived from UKIDSS GCS |
| This view defines a reliable subset of point-like sources from the UKIDSS Galactic Clusters Survey (GCS). If your application requires a seamless selection of reliable sources consistently classified as point-like (i.e. stars) in the GCS then use this view. NB: as always, there is a trade-off between completeness and reliability. If completeness is more important than high reliability, then use gcsPointSource since it is optimised for completeness and NOT high reliability. If a very clean, highly reliable selection is required, then use this view. Because reliability is optimised over completeness here, discrete classification codes are used as these are conservative in flagging ojects as point-like. The selection is based on stellar detecions in JHK (e.g. single passband detections will NOT appear in this view) with a tighter ellipticity cut than is in the notionally complete view. |
SELECT *
FROM gcsSource
WHERE (priOrSec<=0 OR priOrSec=frameSetID)-- seamless selection
AND ((zClass=-1 AND zEll<0.2) OR zClass = -9999)-- reliable Z point det OR no Z det
AND ((yClass=-1 AND yEll<0.2) OR yClass = -9999)-- reliable Y point det OR no Y det
AND jClass=-1 AND jEll<0.2 -- reliable J point det
AND hClass=-1 AND hEll<0.2 -- reliable H point det
AND k_1Class=-1 AND k_1Ell<0.2 -- reliable K1 point det
AND ((k_2Class=-1 AND k_2Ell<0.2) OR k_2Class = -9999) -- reliable K2 point det OR no K2 det