II/360ivo://CDS.VizieR/II/360CDSMarton G.Abraham P.Szegedi-Elek E.Varga J.Kun M.Kospal A.,Varga-Verebelyi E.Hodgkin S.Szabados L.Beck R.Kiss Cs.2024-01-08T13:57:31Z2020-02-20T08:33:02ZCDS support team

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

cds-question@unistra.frsurveysvisible-astronomynarrow-band-photometryinfrared-photometryastronomical-object-identificationThe second Gaia Data Release (DR2) contains astrometric and photometric data for more than 1.6 billion objects with mean Gaia G magnitude <20.7, including many Young Stellar Objects (YSOs) in different evolutionary stages. In order to explore the YSO population of the Milky Way, we combined the Gaia DR2 database with WISE and Planck measurements and made an all-sky probabilistic catalogue of YSOs using machine learning techniques, such as Support Vector Machines, Random Forests, or Neural Networks. Our input catalogue contains 103 million objects from the DR2xAllWISE cross-match table. We classified each object into four main classes: YSOs, extragalactic objects, main-sequence stars and evolved stars. At a 90% prob- ability threshold we identified 1 129 295 YSO candidates. To demonstrate the quality and potential of our YSO catalogue, here we present two applications of it. (1) We explore the 3D structure of the Orion A star forming complex and show that the spatial distribution of the YSOs classified by our procedure is in agreement with recent results from the literature. (2) We use our catalogue to classify published Gaia Science Alerts. As Gaia measures the sources at multiple epochs, it can efficiently discover transient events, including sudden brightness changes of YSOs caused by dynamic processes of their circumstellar disk. However, in many cases the physical nature of the published alert sources are not known. A cross-check with our new catalogue shows that about 30% more of the published Gaia alerts can most likely be attributed to YSO activity. The catalogue can be also useful to identify YSOs among future Gaia alerts.2019MNRAS.487.2522Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/II/360CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)II/328 : AllWISE Data Release (Cutri+ 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=II/360https://vizier.iucaa.in/viz-bin/VizieR-2?-source=II/360http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=II/360https://vizier.cds.unistra.fr/viz-bin/votable?-source=II/360https://vizier.iucaa.in/viz-bin/votable?-source=II/360http://vizieridia.saao.ac.za/viz-bin/votable?-source=II/360GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table II/360/catalog (Gaia DR2 X AllWise catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/II/360/catalog?https://vizier.iucaa.in/viz-bin/conesearch/II/360/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/II/360/catalog?GETtext/xml+votable180.050000true44.841162924.090051050.005555555555555556Hips catalogue for table II/360/cataloghttps://hipscat.cds.unistra.fr/HiPSCatService/II/360/catalog2/4-5 12 14 55 60-61 92 94-95 114-115 118 147 153 162 3/1 5 13 24-25 27-28 30-31 45-47 52 54 60 62 202-203 206 218-219 224-225 228-229 252-253 325 327 333 335-336 338 344 346-347 367 374 450-451 454-455 466-467 476 478-481 484 496-497 500-501 581 583 592-594 600 602 620-621 623-624 652-654 658-659 662-665 668-669 671-672 4/9 12 16-18 27-28 30 48-49 61 104-105 107 116-118 159 179 212 214 222 244 252 255 424 819 828 830-831 859-860 863 866-867 870-871 904-905 908 920-921 924-925 996-997 999 1020-1021 1297 1305 1307 1329 1331 1337-1339 1356 1358 1380 1382-1383 1428-1429 1431 1446-1447 1453 1455 1458 1463-1465 1467 1488 1490 1502 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48796 48798 48812 48824-48825 48827 48842-48843 48864-48865 48867 48994-48996 48998-49001 49004 49006 49010-49011 49016-49017 49019-49020 49064 49066 49105 49107-49108 49110 491131.1166583743361574e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/II/360?format=asciiOpticalInfrareddefaultII/360/catalogGaia DR2 X AllWise catalogLEGProbability of the source being an extragalactic object using all WISE bands (LEG)stat.fit.goodnessdoublee_LEGError of the LEG probability (LEGerr)stat.errordoubleLMSProbability of the source being a main-sequence star using all WISE bands (LMS)stat.fit.goodnessdoublee_LMSError of the LMS probability (LMSerr)stat.errordoubleSourceGaia DR2 source ID (gid)meta.id;meta.mainindexedRA_ICRSBarycentric right ascension (ICRS) at Ep=2015.5 (ra)degpos.eq.ra;meta.mainDE_ICRSBarycentric declination (ICRS) at Ep=2015.5 (dec)degpos.eq.dec;meta.mainLEProbability of the source being an evolved star using all WISE bands (LE)stat.fit.goodnessdoublee_LEError of the LE probability (LEerr)stat.errordoubleLYProbability of the source being a YSO using all WISE bands (LY)stat.fit.goodnessdoublee_LYError of the LY probability (LYerr)stat.errordoubleGmagG-band mean magnitude (Vega) (gmean)magphot.mag;em.optdoubletau353GHz R2.01 Planck dust opacity value (tau)phys.absorption.coeffdoubleAllWISEAllWISE designation (wid)meta.id.crosscharindexedRAAdegAllWISE Right ascension (J2000) (raw)degpos.eq.raDEAdegAllWISE Declination (J2000) (decw)degpos.eq.decW1magAllWISE W1 magnitude (W1mag)magphot.mag;em.IR.3-4umfloatW2magAllWISE W2 magnitude (W2mag)magphot.mag;em.IR.4-8umfloatW3magAllWISE W3 magnitude (W3mag)magphot.flux.density;em.IR.8-15umfloatW4magAllWISE W4 magnitude (W4mag)magphot.flux.density;em.IR.15-30umfloatJmag2MASS J magnitude (Jmag)magphot.mag;em.IR.JfloatHmag2MASS H magnitude (Hmag)magphot.mag;em.IR.JfloatKmag2MASS K magnitude (Kmag)magphot.mag;em.IR.Kfloate_W1mag? AllWISE W1 Magnitude error (e_W1mag)magstat.error;phot.mag;em.IRfloatnullablee_W2mag? AllWISE W2 Magnitude error (e_W2mag)magstat.error;phot.mag;em.IRfloatnullablee_W3mag? AllWISE W3 Magnitude error (e_W3mag)magstat.error;phot.mag;em.IRfloatnullablee_W4mag? AllWISE W4 Magnitude error (e_W4mag)magstat.error;phot.mag;em.IRfloatnullablee_Jmag? 2MASS J magnitude error (e_Jmag)magstat.error;phot.mag;em.IR.Jfloatnullablee_Hmag? 2MASS H magnitude error (e_Hmag)magstat.error;phot.mag;em.IR.Jfloatnullablee_Kmag? 2MASS K magnitude error (e_Kmag)magstat.error;phot.mag;em.IR.KfloatnullableRProbability that WISE W3 and W4 detections are real (R)phot.mag;em.opt.RfloatSEProbability of the source being an evolved star without W3 and W4 WISE bands (SE)stat.fit.goodnessdoublee_SEError of the SE probability (SEerr)stat.errordoubleSEGProbability of the source being an extragalactic object without W3 and W4 WISE bands (SEG)stat.fit.goodnessdoublee_SEGError of the SEG probability (SEGerr)stat.errordoubleSMSProbability of the source being a main-sequence star without W3 and W4 WISE bands (SMS)stat.fit.goodnessdoublee_SMSError of the SMS probability (SMSerr)stat.errordoubleSYProbability of the source being a YSO without W3 and W4 WISE bands (SY)stat.fit.goodnessdoublee_SYError of the SY probability (SYerr)stat.errordouble