VII/285ivo://CDS.VizieR/VII/285CDSBailer-Jones C.A.L.Fouesneau M.Andrae R.2020-04-07T13:27:00Z2019-11-25T14:48:40ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsurveysquasarsgalaxiesWe provide probabilistic quasar and galaxy classifications for 2.7 million sources in Gaia Data Release 2. This has been achieved using a supervised classification method (Gaussian Mixture Models) based only on photometric and astrometric data (8 features) in Gaia-DR2. The model is trained empirically to classify objects into three classes - star, quasar, galaxy - for all objects with G>=14.5mag down to the Gaia magnitude limit of G=21.0mag. We provide the probabilities for being a quasar (pqso) and a galaxy (pgal); the probability of being a star is pstar = 1-(pqso+pgal), and all other Gaia data can be obtained by cross-matching Gaia-DR2 using the source identifier. As our main goal is to identify extragalactic objects, we only report objects with pqso+pgal>0.5. These probabilities incorporate a sensible class prior, namely that quasars are 500 times rarer than stars, and that galaxies 7500 times rarer than stars. See the paper for details of the purity and completeness of samples drawn from this catalogue, and for more details of its construction, contents, and validation.2019MNRAS.490.5615Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/VII/285CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=VII/285https://vizier.iucaa.in/viz-bin/VizieR-2?-source=VII/285http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=VII/285https://vizier.cds.unistra.fr/viz-bin/votable?-source=VII/285https://vizier.iucaa.in/viz-bin/votable?-source=VII/285http://vizieridia.saao.ac.za/viz-bin/votable?-source=VII/285GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table VII/285/gdr2ext (GDR2 extragalactic catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/VII/285/gdr2ext?https://vizier.iucaa.in/viz-bin/conesearch/VII/285/gdr2ext?http://vizieridia.saao.ac.za/viz-bin/conesearch/VII/285/gdr2ext?GETtext/xml+votable180.050000true44.99495431928010.161376070330.0055555555555555560/1 2 4 6 8 1/30 42 43 44 45 46 2/1 2 8 9 10 48 49 52 53 58 59 62 80 82 85 87 88 90 91 113 114 116 117 124 126 127 144 145 146 149 151 152 154 156 157 159 160 161 162 188 189 190 3/0 2 3 12 14 15 23 26 29 44 45 46 48 53 55 61 62 63 200 201 202 204 205 206 216 217 219 220 221 222 225 226 227 230 231 247 254 255 324 326 327 332 333 337 339 345 356 358 359 368 370 372 373 375 378 448 449 451 460 462 472 476 477 479 500 502 503 588 592 593 595 600 601 603 620 622 632 633 635 653 654 655 656 657 658 660 661 666 667 669 670 764 765 766 4/4 5 6 52 54 55 64 74 75 82 83 85 86 87 90 97 98 99 108 121 123 125 127 188 200 202 208 219 224 226 237 238 239 241 242 243 812 813 814 828 829 830 872 873 875 898 899 914 915 960 961 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49150https://cdsarc.cds.unistra.fr/viz-bin/moc/VII/285?format=asciidefaultVII/285/gdr2extGDR2 extragalactic cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGDR2Gaia-DR2 identification number (source_id)meta.id;meta.mainpqsoQuasar probabilitystat.fit.goodnessdoublepgalGalaxy probabilitystat.fit.goodnessdoubleRA_ICRSGaia DR2 right ascension (ICRS) at Ep=2015.5 (added by CDS)degpos.eq.ra;meta.mainindexedDE_ICRSGaia DR2 declination (ICRS) at Ep=2015.5 (added by CDS)degpos.eq.dec;meta.mainindexed_RA.icrsRight ascension (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed