Catalog of QSO candidates with Gaia EDR3 J/other/RAA/23.B ivo://CDS.VizieR/J/other/RAA/23.B5006 doi:10.26093/cds/vizier/dx/cdkmfaag CDS Wu Q. Liao S. Qi Z. Luo H. Tang Z. Cao Z. 2026-02-10T20:08:10Z 2023-02-01T13:30:40Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr quasars surveys infrared-sources visible-astronomy trigonometric-parallax proper-motions Quasars are very important in materializing the reference frame. The excess emission of AGNs (active galactic nuclei) in the mid-infrared band can be used to identify quasar candidates. As extremely distant and point-like objects, quasars also could be further selected by astrometry method. Increasing the number of reliable quasar candidates is necessary in characterizing the properties of Gaia astrometric solution and evaluating the reliability of Gaia's own quasars classification. We identify quasars by using appropriate AllWISE [W1-W2] color and different combinations of astrometric criteria. Together with the contamination and completeness, the magnitude, astrometric properties, density distribution, and the morphological indexes of these selected quasars are evaluated. We obtain a quasar candidate catalog of 1503373 sources, which contains 1186690 candidates (78.9%) in common with the Gaia EDR3_AGN catalog and 316683 newly identified quasar candidates. The completeness of this catalog is around 80% compared to LQAC5, and the purity of the overall catalog is about 90%. 2023RAA....23b5006W https://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/RAA/23.B5006 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/350 : Gaia EDR3 (Gaia Collaboration, 2020) II/328 : AllWISE Data Release (Cutri+ 2013) V/154 : Sloan Digital Sky Surveys (SDSS) DR16 (Ahumada+, 2020) J/A+A/624/A145 : Astrometric Catalogue 5, LQAC-5 (Souchay+, 2019) J/A+A/618/A144 : QSO candidates catalog with APOP + ALLWISE (QCC) (Guo+, 2018) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/RAA/23.B5006 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/RAA/23.B5006 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/RAA/23.B5006 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/RAA/23.B5006 https://vizier.iucaa.in/viz-bin/votable?-source=J/other/RAA/23.B5006 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/RAA/23.B5006 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/other/RAA/23.B5006/qcc (Quasar Candidates Catalog) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/RAA/23.B5006/qcc? https://vizier.iucaa.in/viz-bin/conesearch/J/other/RAA/23.B5006/qcc? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/RAA/23.B5006/qcc? 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42826-42829 42831 42834 42845 42848-42849 42851-42853 42857-42860 42862-42863 42868-42870 42968-42969 42971 43037-43038 43063 43065-43067 43069 43071 43073 43083 43085-43087 43092-43094 43096 43098-43099 43143 43169-43171 47792-47793 47795 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/RAA/23.B5006?format=ascii Optical Infrared default J/other/RAA/23.B5006/qcc Quasar Candidates Catalog Solved [31/95] 31 for five-parameter solutions, 95 for six-parameter solutions (astrometric_params_solved) meta.code int W1-W2 AllWISE W1-W2 colour (W1_mag-W2mag) mag phot.color;em.IR;em.IR double Class [A/B/RQC] A, B for quasar candidates in QCC-A and QCC-B, RQC for the reliable quasar candidates in QCC-B (Class) meta.code.class char Flag ABQ for abnormal astrometric quasar candidates (Flag) meta.code.error char _RA.icrs Right ascension (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.ra nullable indexed _DE.icrs Declination (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.dec nullable indexed recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaEDR3 Unique Gaia EDR3 source identifier (source_id) meta.id;meta.main WISE Unique AllWISE source identifier (WISE_id) meta.id char RA_ICRS Right Ascension (ICRS) at Ep=2016.0 (ra) deg pos.eq.ra;meta.main indexed e_RA_ICRS Error of right ascension (ra_error) mas stat.error;pos.eq.ra float DE_ICRS Declination (ICRS) at Ep=2016.0 (dec) deg pos.eq.dec;meta.main indexed e_DE_ICRS Error of right declination (dec_error) mas stat.error;pos.eq.dec float plx Parallax of the source at J2016.0 (parallax) mas pos.parallax.trig double e_plx Error of parallax (parallax_error) mas stat.error;pos.parallax double PM Total proper motion (pm) mas/yr pos.pm double pmRA Proper motion in right ascension direction (pmra) mas/yr pos.pm;pos.eq.ra double e_pmRA Error of proper motion in right ascension direction (pmra_error) mas/yr stat.error;pos.pm;pos.eq.ra float pmDE Proper motion in declination direction (pmdec) mas/yr pos.pm;pos.eq.dec double e_pmDE Error of proper motion in declination direction (pmdec_error) mas/yr stat.error;pos.pm;pos.eq.dec float pmRApmDEcor [-1/1] Correlation between pmRA and pmDE (pmra_pmdec_corr) pos.pm;pos.eq.ra float NgAL Number of good observations AL (ngood_AL) meta.number int Gmag ? G-band mean magnitude (G_mag) mag phot.mag;em.opt double nullable