| High reliability sub-selection of galaxies from Source. |
| This view of table Source defines a reliable selection of extended objects (ie. galaxies) from Source. Reliable in this context means that each galaxy must appear on the UKJ, UKR and UKI plates; must be classed as non-stellar on UKJ & UKR; must not be deblended on UKJ or UKR; and must have good quality UKJ, UKR & UKI (ie. quality < 128). A magnitude cut of Bj < 20.0 provides a reliability of better than approximately 90%. The use of this, or any other, SSA view depends on the particular science application. If your science application needs a highly reliable selection of galaxies, then use this view. But be aware that this selection is not in any sense complete, particularly at faint magnitudes. Note also that because the SSA has general poor completeness of extragalactic objects at low Galactic latitudes and severe contamination by blended stars which are indistinguishable from extended sources, this view is currently limited to |b| > 35.0 and Galactic Centre distance d > 45.0 (to avoid the crowded Bulge region). |
SELECT *
FROM Source
WHERE objidB > 0 AND objidR2 > 0 AND objidI > 0 AND
classB = 1 AND classR2 = 1 AND
blendB = 0 AND blendR2 = 0 AND
qualB < 128 AND qualR2 < 128 AND qualI < 128 AND
gcormagB < 20.0 AND
d > 45.0 AND (b > +35.0 OR b < -35.0)