| 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). |
SELECT *
FROM gcsSource
/* Seamless selection of unique objects: */
WHERE (priOrSec <= 0 OR priOrSec = frameSetID)
/* High quality, highly likely point detection in J, H and K1: */
AND jClass = -1 AND jppErrBits = 0
AND hClass = -1 AND hppErrBits = 0
AND k_1Class = -1 AND k_1ppErrBits = 0
/* High quality, highly likely point detection, OR none, in Z, Y and K2: */
AND (zClass = -1 OR zClass = -9999) AND zppErrBits <= 0
AND (yClass = -1 OR yClass = -9999) AND yppErrBits <= 0
AND (k_2Class = -1 OR k_2Class = -9999) AND k_2ppErrBits <= 0
/* J, H and K (first epoch) positional coincidence within 1 arcsec: */
AND jXi BETWEEN -1.0 AND +1.0 AND jEta BETWEEN -1.0 AND +1.0
AND hXi BETWEEN -1.0 AND +1.0 AND hEta BETWEEN -1.0 AND +1.0
AND k_1Xi BETWEEN -1.0 AND +1.0 AND k_1Eta BETWEEN -1.0 AND +1.0
/* Z and Y positional coincidence within 1 arcsec when available: */
AND ((zXi BETWEEN -1.0 AND +1.0 AND zEta BETWEEN -1.0 AND +1.0) OR zXi < -0.9e9)
AND ((yXi BETWEEN -1.0 AND +1.0 AND yEta BETWEEN -1.0 AND +1.0) OR yXi < -0.9e9)
The details of the table defined by this view are available here.