| Merged, seamless point source catalogue derived from the UKIDSS LAS |
| This view defines a subset of point-like sources from the UKIDSS Large Area Survey (LAS). If your science application requires a seamless selection of 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 this view since it is optimised for completeness and NOT high reliability. If a very clean, highly reliable but incomplete selection is required, then use view reliableLasPointSource. Because completeness is optimised over reliability here, discrete classification codes are not used; instead, morphological selection is done using cuts on profile statistics and image ellipticity. The selection is based on +/- 3 sigma profile statistic cuts, 33% image elongation cuts, and detection required in YJH. |
SELECT *
FROM lasSource
WHERE (priOrSec<=0 OR priOrSec=frameSetID) -- seamless selection
AND yClassStat BETWEEN -3.0 AND +3.0 AND yEll<0.25 -- good Y point det
AND j_1ClassStat BETWEEN -3.0 AND +3.0 AND j_1Ell<0.25 -- good J1 point det
AND hClassStat BETWEEN -3.0 AND +3.0 AND hEll<0.25 -- good H point det
AND ((j_2ClassStat BETWEEN -3.0 AND +3.0 AND j_2Ell<0.25) OR j_2Class = -9999) -- good J2 point det OR no J2 det
AND ((kClassStat BETWEEN -3.0 AND +3.0 AND kEll<0.25) OR kClass = -9999) -- good K point det OR no K det