| 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). |
SELECT *
FROM lasSource
/* Seamless selection of unique objects: */
WHERE (priOrSec<=0 OR priOrSec=frameSetID)
/* High quality, highly likely point detection in Y, J1 and H: */
AND yClass = -1 AND yppErrBits = 0
AND j_1Class = -1 AND j_1ppErrBits = 0
AND hClass = -1 AND hppErrBits = 0
/* High quality, highly likely point detection, OR none, in J2 and K: */
AND (j_2Class=-1 OR j_2Class = -9999) AND j_2ppErrBits <= 0
AND (kClass=-1 OR kClass = -9999) AND kppErrBits <= 0
/* Y, J (first epoch), H and K positional coincidence within 1 arcsec: */
AND yXi BETWEEN -1.0 AND +1.0 AND yEta BETWEEN -1.0 AND +1.0
AND j_1Xi BETWEEN -1.0 AND +1.0 AND j_1Eta BETWEEN -1.0 AND +1.0
AND hXi BETWEEN -1.0 AND +1.0 AND hEta BETWEEN -1.0 AND +1.0
AND ((kXi BETWEEN -1.0 AND +1.0 AND kEta BETWEEN -1.0 AND +1.0) OR kXi < -0.9e9)
The details of the table defined by this view are available here.