The completeness of the QUBRICS Survey J/A+A/708/A363 ivo://CDS.VizieR/J/A+A/708/A363 CDS Porru M. Cristiani S. Guarneri F. Calderone G. Grazian A. Boutsia K.,Trost A. D'Odorico V. Cupani G. Marques C.M.J. Chiti Tegli F.,Fontanot F. 2026-05-04T07:43:19Z 2026-04-23T09:13:32Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr surveys quasars redshifted visible-astronomy Quasi-Stellar Objects (QSOs) are essential for investigating the structure and evolution of the Universe. Historically, their identification has been concentrated in the northern hemisphere, primarily due to the sky coverage of major astronomical surveys. The QUBRICS (QUasars as BRIght beacons for Cosmology in the Southern hemisphere) survey, started in 2019 to address this asymmetry, has identified more than 1300 new bright (i<19.5) high-redshift (2.5<z<6) QSOs in the southern sky. This study aims to quantify, using an independent QSO sample, the completeness and recall of the QUBRICS QSO selection methods, based on XGB (eXtreme Gradient Boosting) and PRF (Probabilistic Random Forest), since completeness is a fundamental metric for ensuring the statistical robustness of QSO-based cosmological investigations. A subset (G<18.25, |b|>25deg, negligible parallax and proper motion) of Gaia DR3 sources with low-resolution spectra was analyzed, obtaining a sample of 3501 QSOs.To determine how many QSOs were correctly identified as candidates, we crossmatched this independent sample with the datasets used for selection: 894 QSOs with z>2.5 fell within the XGB dataset footprint, of which 152 were unclassified and thus eligible for completeness testing. Similarly, 675 QSOs with z>2.5 were within the PRF dataset footprint, including 69 unclassified objects. The XGB correctly identified as candidates 136 (89%) of the 152 QSOs with z>2.5 present in the XGB dataset as unclassified objects.The PRF correctly identified as candidates 46 (66%) of the 69 QSOs with z>2.5 present in the PRF dataset as unclassified objects.These findings confirm the high efficiency of the QUBRICS selection methods (recall=89%) and provide the completeness estimate for spectroscopically confirmed QSOs (82%), necessary for cosmological studies using QUBRICS data. This work also provides reliable redshifts for 1223 new QSOs (median redshift z=2.1 and magnitude G=17.8), that will help improve the performance of future selections. 2026A&A...708A.363P https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A363 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/355 : Gaia DR3 Main Source catalog (Gaia Collaboration, 2022) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/708/A363 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/708/A363 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/708/A363 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/708/A363 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/708/A363 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/708/A363 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/708/A363/table1 (QSOs identified from Gaia DR3 spectra) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/708/A363/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/708/A363/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/708/A363/table1? 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49000 49012 49026 49028 49031 49048 49072 49083 49085-49086 49094 49124 49126-49127 49131 49135 1.9867573869263685e-19 3.916500758235022e-19 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/708/A363?format=ascii Optical default J/A+A/708/A363/table1 QSOs identified from Gaia DR3 spectra recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Qid QUBRICS unique identifier meta.id int GaiaDR3 Gaia DR3 unique source identifier meta.id;meta.main RA_ICRS Gaia DR3 Right Ascension (ICRS) at Ep=2000 pos.eq.ra;meta.main DE_ICRS Gaia DR3 Declination (ICRS) at Ep=2000 pos.eq.dec;meta.main Gmag Gaia DR3 G magnitude mag phot.mag;em.opt.V float QOP Spectrum quality rating meta.code.qual int zQUG Spectroscopic redshift src.redshift;pos.heliocentric float