Table 2
Astrometric criteria based on the Gaia G-band magnitude (G) and their corresponding completeness, purity, and stellar contamination.
| Magnitude range | Astrometric criteria | Completeness | Purity | Stellar contamination | Source number in bin |
|---|---|---|---|---|---|
| 12 ⩽ G < 19 | log f0pm ⩾ −1 log f0plx ⩾ −1 | 91.33% | 96.71% | 3.29% | NQ = NS = 86 553 |
| 19 ⩽ G < 20 | log f0pm ⩾ −2 log f0plx ⩾ −2 | 97.50% | 77.10% | 22.90% | NQ = NS = 233 821 |
| 20 ⩽ G ⩽ 21 | log f0pm ⩾ −3 log f0plx ⩾ −2 | 97.65% | 61.80% | 38.20% | NQ = NS = 377 405 |
| 12 ⩽ G ⩽ 21 (Unbinned) | log f0pm ⩾ −3 log f0plx ⩾ −2 | 97.91% | 69.24% | 30.76% | NQ = NS = 697 779 |
| Total | Criteria of the first three bins | 96.82% | 69.37% | 30.63% | NQ = NS = 697 779 |
Notes. The fourth row displays selection results without binning the G magnitude. The last row is the comprehensive selection performance of the final multi-threshold astrometric criteria. The numbers of quasars (NQ) and stars (NS) before astrometric filtering in each magnitude bin are given in the last column.
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