VizieR Online Data Catalog: Catalog of QSO candidates with Gaia EDR3 (Wu+, 2023)

A quasar candidate catalog (QCC) of 1503373 sources (about 90% purity) is obtained by astrometric and mid-infrared methods in Gaia EDR3, which has 1,186,690 (78.9%) candidates in common with Gaia EDR3's AGN catalog. The purity of 316,683 newly identified quasar candidates is about 42.2%-58.5%. Compared with LQAC5 (Souchay et al., Cat. J/A+A/624/A145), the completeness of our catalog is around 80%, and we randomly select 4171 common sources of our catalog and SDSS DR16 (See Cat. V/154), according to the spectrums of SDSS, about 99.7% of which are quasars, 94.0% are point-like sources. Compared to the previous similar research (Guo et al., 2018A&A...618A.144G, Cat. J/A+A/618/A144), we have selected more quasar candidates (1503373 versus 662753) with higher purity (90% versus 77%). Star contamination is present in the newly identified subset and the purity of this subset improved significantly after we used more stringent astrometric and color conditions. In addition, we found that the purity of quasar candidates selected by mid-infrared and astrometric data decreases around the LMC/SMC, area near the Galactic Equator and at the fainter magnitude.

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