| Reliable, but incomplete, point source catalogue derived from UKIDSS LAS |
| This view defines a reliable subset of point-like sources from the UKIDSS Large Area Survey (LAS). If your science application requires a seamless selection of reliable sources consistently classified as point-like (e.g. stars or QSOs) in the LAS 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 lasPointSource 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 YJH (i.e. single passband detections will NOT appear in this view) with a tighter ellipticity cut than is in the notionally complete view. |
SELECT *
FROM lasSource
WHERE (priOrSec<=0 OR priOrSec=frameSetID)-- seamless selection
AND yClass=-1 AND yEll<0.2 -- reliable Y point det
AND j_1Class=-1 AND j_1Ell<0.2 -- reliable J1 point det
AND hClass=-1 AND hEll<0.2 -- reliable H point det
AND ((j_2Class=-1 AND j_2Ell<0.2) OR j_2Class = -9999) -- reliable J2 point det OR no J2 det
AND ((kClass=-1 AND kEll<0.2) OR kClass = -9999) -- reliable K point det OR no K det