VII/293ivo://CDS.VizieR/VII/293CDSWilson A.J.Lakeland B.S.Wilson T.J.Naylor T.2023-05-26T09:03:56Z2023-03-07T08:33:29ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsgalaxy-planesmilky-way-galaxyastrometryvisible-astronomytrigonometric-parallaxphotometryvariable-starsA naive Bayes classifier for identifying Class II YSOs has been constructed and applied to a region of the Northern Galactic Plane containing 8 million sources with good quality Gaia EDR3 parallaxes. The classifier uses the five features: Gaia G-band variability, WISE mid-infrared excess, UKIDSS and 2MASS near-infrared excess, IGAPS H{alpha} excess and overluminosity with respect to the main sequence. A list of candidate Class II YSOs is obtained by choosing a posterior threshold appropriate to the task at hand, balancing the competing demands of completeness and purity. At a threshold posterior greater than 0.5 our classifier identifies 6504 candidate Class II YSOs. At this threshold we find a false positive rate around 0.02 per cent and a true positive rate of approximately 87 per cent for identifying Class II YSOs. The ROC curve rises rapidly to almost one with an area under the curve around 0.998 or better, indicating the classifier is efficient at identifying candidate Class II YSOs. Our map of these candidates shows what are potentially three previously undiscovered clusters or associations. When comparing our results to published catalogues from other young star classifiers, we find between one quarter and three quarters of high probability candidates are unique to each classifier, telling us no single classifier is finding all young stars.2023MNRAS.521..354Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/VII/293CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/350 : Gaia EDR3 (Gaia Collaboration, 2020)II/328 : AllWISE Data Release (Cutri+ 2013)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)V/165 : IGAPS merged IPHAS and UVEX northern Galactic plane (Monguio+, 2020)http://wsa.roe.ac.uk : UKIDSSDR11plus reliableGpsPointSource (Lucas+ 2008)https://stilism.obspm.fr : Stilism homepage (Lallement+ 2014,Capitanio+ 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=VII/293https://vizier.iucaa.in/viz-bin/VizieR-2?-source=VII/293http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=VII/293https://vizier.cds.unistra.fr/viz-bin/votable?-source=VII/293https://vizier.iucaa.in/viz-bin/votable?-source=VII/293http://vizieridia.saao.ac.za/viz-bin/votable?-source=VII/293GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table VII/293/catalog (Results from the naive Bayes classifier)https://vizier.cds.unistra.fr/viz-bin/conesearch/VII/293/catalog?https://vizier.iucaa.in/viz-bin/conesearch/VII/293/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/VII/293/catalog?GETtext/xml+votable180.050000true79.5153024416230.77165895580.0055555555555555563/223 228-229 380 382 4/81 83 89 91 111-112 114 120 122 189-191 197 199 204-206 225-228 232 810-811 879 890-891 896-897 900-901 903 960-961 964-965 976-977 1377 1379-1380 1382 1388 1390-1391 1477 1479 1485 1490 1496 1498 1845 1888 1890-1891 1894-1895 1900-1901 1912-1913 1915 1918-1919 5/321 323 329 331 336 338 344 346 353 355 361-363 368 413 415 437-439 452-454 460 462 735 751 755 785 787 793-795 807 813-815 828 830 832 834 840 899 920 932-934 936-938 3258-3259 3262-3263 3306-3307 3327 3498-3499 3502-3503 3513-3515 3550-3551 3558-3559 3596-3597 3608-3609 3848-3850 3852-3853 3864-3865 3868-3869 3912 3920-3922 3924 5434 5505 5534 5541 5543 5556 5558-5559 5904-5905 5907 5913 5915 5948-5949 5951-5952 5954 5990 5996 5998 6037 6039 6128 6130 6136 6138 7294-7295 7379 7385 7388-7389 7391 7556 7558-7559 7570 7588-7589 7613 7626-7627 7630 7656-7657 7659 7664 7666-7667 7670-7671 8016-8017 8020-8021 8023 6/1281 1283 1289 1291 1313 1315 1321 1323 1348 1350 1356 1358 1380 1382 1388 1390 1409 1411 1417 1419 1441-1443 1480-1482 1504 1506 1623 1629 1631 1659 1745 1747 1767 1773 1775 1820 1822 1844 1936-1938 1944 1946 2935 2939 2999 3003 3015 3019 3135 3147 3169-3171 3221 3223 3247 3249-3251 3316 3318 3332 3334 3340 3368 3370 3456 3589-3591 3593 3595 3664-3666 3672 3684 3686 3688-3690 3740 3756 3760 3776 12936 12938-12939 12942-12943 12954 13024 13026-13027 13030-13031 13042 13240 13242-13243 13246-13247 13290-13291 13294-13295 13305-13307 14002-14003 14006-14007 14047 14050-14051 14191 14198-14199 14218-14219 14221-14223 14230-14231 14368-14369 14372-14373 14397 14440-14441 14444-14445 14725 14736-14737 14740-14741 14784-14785 15404-15406 15416-15417 15420-15421 15464-15465 15468-15469 15652-15654 15664-15665 15668 15692-15694 15700-15702 15704 21679 21690-21691 21693-21695 21740 21742 22028-22029 22031 22053 22055 22104 22106 22128 22130-22131 22142 22161 22163 22169 22196-22197 22199 22205 22207 22228 22230 22432 22434 22440 22442-22443 23625 23627 23649 23749 23751 23757 23801 23803 23820 23822 23866 23952 23954 23990 23996 23998 24145 24180-24181 24183 24189 24191 24277 24416 24418 24424 24426 24556 24558 29167 29170-29171 29509 29511 29549 29560-29561 29864 29866-29867 29870-29871 30230-30231 30274 30284 30286-30287 30298-30299 30336-30337 30340-30341 30343 30361 30364-30365 30436-30437 30448-30449 30451 30498-30499 30502 30526-30527 30632-30633 30660 30662-30663 30674-30675 32017 32020-32021 32023 32076-32077 32088-32089 32091https://cdsarc.cds.unistra.fr/viz-bin/moc/VII/293?format=asciiOpticaldefaultVII/293/catalogResults from the naive Bayes classifierGvarCIICap[0/1] Variability CII likelihood capped (GvarCIICapped)meta.codeintGvarOCap[0/1] Variability Other likelihood capped (GvarOtherCapped)meta.codeintW1-W2[-1.93/1.95]? AllWISE (W1-W2) (W1mW2)magphot.color;em.IR;em.IRfloatnullableW1-W2CIIL[0.09/1] (W1-W2) CII likelihood (W1mW2CIILike)stat.likelihooddoubleW1-W2OL[0/1] (W1-W2) Other likelihood (W1mW2OtherLike)stat.likelihooddoubleW1-W2LR[0.09/999] (W1-W2) CII/Other likelihood ratio (W1mW2LikeRatio)stat.likelihood;arith.ratiodoubleW1-W2Calc[0/1] (W1-W2) likelihood calculated (W1mW2Calc)meta.codeintW1-W2CIICap[0/1] (W1-W2) CII likelihood capped (W1mW2CIICapped)meta.codeintW1-W2OCap[0/1] (W1-W2) Other likelihood capped (W1mW2OtherCapped)meta.codeintH-KEx[-1.94/2.61]? (H-K) offset (HmKEx)magphot.mag;arith.zpfloatnullableH-KExCIIL[0.04/2.25] (H-K) CII likelihood (HmKExCIILike)stat.likelihooddoubleH-KExOL[0/1] (H-K) Other likelihood (HmKExOtherLike)stat.likelihooddoubleH-KExLR[0.04/999.0] (H-K) CII/Other likelihood ratio (HmKExLikeRatio)phot.color;em.IR.H;em.IR.KdoubleH-KExCalc[0/1] (H-K) likelihood calculated (HmKExCalc)meta.codeintH-KExCIICap[0/1] (H-K) CII likelihood capped (HmKExCIICapped)meta.codeintH-KExOCap[0/1] (H-K) Other likelihood capped (HmKExOtherCapped)meta.codeintr-HaEx[-1.47/1.7]? IGAPS (r-Ha) offset (rmHaEx)magphot.mag;arith.zpfloatnullabler-HaExCIIL[0.07/2.01] H-alpha CII likelihood (rmHaExCIILike)stat.likelihooddoubler-HaExOL[0/5.23] H-alpha Other likelihood (rmHaExOtherLike)stat.likelihooddoubler-HaExLR[0.33/999.0] H-alpha CII/Other likelihood ratio (rmHaExLikeRatio)meta.notedoubler-HaExCalc[0/1] H-alpha likelihood calculated (rmHaExCalc)meta.codeintr-HaExCIICap[0/1] H-alpha CII likelihood capped (rmHaExCIICapped)meta.codeintr-HaExOCap[0/1] H-alpha Other likelihood capped (rmHaExOtherCapped)meta.codeintlog10Age[-6.9/15.0]? Isochronal age log10(age) (log10Age)log(yr)time.agefloatnullableOldMaxIsoAge[0/1] Iso age older than isochrones flag (OlderMaxIsoAge)meta.codeintYoungMinIsoAge[0/1] Iso age younger than isochrones flag (YoungerMinIsoAge)meta.codeintGoodClIIYSOFit[0/1] Iso age good fit to YSO isochrones flag (GoodClassIIYSOFit)meta.codeintIsoAgeCIIL[0.04/1] Iso age CII likelihood (IsoAgeCIILike)stat.likelihooddoubleIsoAgeOL[0/1] Iso age Other likelihood (IsoAgeOtherLike)stat.likelihooddoubleIsoAgeLR[0.18/31.84] Iso age CII/Other likelihood ratio (IsoAgeLikeRatio)stat.likelihood;time.age;arith.ratiodoubleIsoAgeCalc[0/1] Iso age calculated (IsoAgeCalc)meta.codeintIsoAgeCIICap[0/1] Iso age CII likelihood capped (IsoAgeCIICapped)meta.codeintIsoAgeOCap[0/1] Iso age Other likelihood capped (IsoAgeOtherCapped)meta.codeintH-KExSource(H-K) feature photometry source, 2MASS, UKIDSS or "No data" (HmKExSource)meta.bibcharGaiaEDR3Gaia EDR3 unique source designation (GaiaEDR3SourceId)meta.id;meta.main_RA.icrsRight ascension (ICRS) at Epoch=J2016. (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.raindexed_DE.icrsDeclination (ICRS) at Epoch=J2016. (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.decindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA_ICRS[0/360] Right ascension (ICRS) at Ep=2016.0 from Gaia EDR3 (RAdeg)degpos.eq.ra;meta.mainindexedDE_ICRS[-13.32/66.88] Declination (ICRS) at Ep=2016.0 from Gaia EDR3 (DEdeg)degpos.eq.dec;meta.mainindexedGLON[20/220] Galactic longitude from Gaia EDR3 (GLON)degpos.galactic.lonGLAT[-4/4] Galactic latitude from Gaia EDR3 (GLAT)degpos.galactic.latdoubleplx[0.5/169.03] Gaia EDR3 parallax zero-point adjusted (plx)maspos.parallax.trigdoubleE(B-V)[0/4.73] E(B-V) from STILISM (EBmV)magphot.color.excessfloatSuspRedd[0/1] Suspect reddening flag (SuspectReddening)meta.codeintGmagCorr[6.81/20.45] Gaia EDR3 G magnitude with official correction (GmagCorr)magphot.mag;em.optfloatrmagCorr[-6.94/15.68]? Parallax corrected dereddened IGAPS r magnitude using Ar=2.38E(B-V) (rmagParCorrDered)magphot.mag;em.opt.Rfloatnullable(r-i)0[-2.53/4.81]? IGAPS (r-i) dereddened (rmiDered)magphot.color;em.opt.R;em.opt.IfloatnullableNFeat[0/5] Number of features in the Bayes calculation (FeaturesCalc)meta.numberintPriorCII[0.001] CII prior (PriorCII)meta.codefloatPriorO[0.999] Other prior (PriorOther)meta.codefloatPostrCII[0/1] Naive Bayes CII posterior (PosteriorCII)meta.codedoublePostO[0/1] Naive Bayes Other posterior (PosteriorOther)meta.codedoubleGFSDFlux[0/1.7] Gaia EDR3 G observed fractional standard deviation of flux (GFracStdDevFlux)stat.stdevdoubleGvarCIIL[0/37.41] Variability CII likelihood (GvarCIILike)stat.likelihooddoubleGvarOL[0/1749.37] Variability Other likelihood (GvarOtherLike)stat.likelihooddoubleGvarLR[0.01/999] Variability CII/Other likelihood ratio (GvarLikeRatio)stat.likelihood;src.var;arith.ratiodoubleGvarCalc[0/1] Variability likelihood calculated (GvarCalc)meta.codeint