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Table 2

Selection criteria.

Parameter QSO candidates Star candidates Galaxy candidates
γ > 0.13 < 0.1
log10(A) > 0.11 > 0.01 < 0.1 ∧ > 0.01
gr < 0.2 >1
zW1 > 2.8 < 2 ⋁ < 1 + 1.25(gr) > 2.3 + 1.25(gr)
W1 – W2 > 0.75 < −0.05 > 0.25 Λ < 0.35
W2 < 15 < 15

Notes. Criteria for selection of candidate QSOs, stars, and galaxies. These are based on the SDSS distributions of Fig. 2 and the parameter regions are plotted in Fig. B.2.

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