J/MNRAS/517/140ivo://CDS.VizieR/J/MNRAS/517/140doi:10.26093/cds/vizier.75170140CDSKinson D.A.Oliveira J.M.van Loon J.T2024-08-22T20:16:22Z2022-11-13T17:14:09ZCDS support team

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

cds-question@unistra.frgalaxiesyoung-stellar-objectsmillimeter-astronomyphotometrysubmillimeter-astronomyinfrared-photometryWe present a supervised machine learning classification of stellar populations in the Local Group spiral galaxy M 33. The Probabilistic Random Forest (PRF) methodology, previously applied to populations in NGC 6822, utilizes both near and far-IR classification features. It classifies sources into nine target classes: young stellar objects (YSOs), oxygen, and carbon-rich asymptotic giant branch stars, red giant branch, and red super-giant stars, active galactic nuclei, blue stars (e.g. O-, B-, and A-type main sequence stars), Wolf-Rayet stars, and Galactic foreground stars. Across 100 classification runs the PRF classified 162746 sources with an average estimated accuracy of ~86 per cent, based on confusion matrices. We identified 4985 YSOs across the disc of M 33, applying a density-based clustering analysis to identify 68 star forming regions (SFRs) primarily in the galaxy's spiral arms. SFR counterparts to known HII regions were recovered with ~91 per cent of SFRs spatially coincident with giant molecular clouds identified in the literature. Using photometric measurements, as well as SFRs in NGC 6822 with an established evolutionary sequence as a benchmark, we employed a novel approach combining ratios of [Halpha]/[24um] and [250um]/[500um] to estimate the relative evolutionary status of all M 33 SFRs. Masses were estimated for each YSO ranging from 6-27M_{sun}_. Using these masses, we estimate star formation rates based on direct YSO counts of 0.63M_{sun}_/yr in M 33's SFRs, 0.79+/-0.16M_{sun}_/yr in its centre and 1.42=/-0.16M_{sun}_/yr globally.2022MNRAS.517..140Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/517/140CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/517/140https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/517/140http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/517/140https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/517/140https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/517/140http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/517/140GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/517/140/table3 (Catalogue of YSOs in M33 classified using the PRF analysis)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/517/140/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/517/140/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/517/140/table3?GETtext/xml+votable180.050000true23.4548291730.671576670.0055555555555555566/2154-2155 22417.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/517/140?format=asciiInfraredMillimeterdefaultJ/MNRAS/517/140/table3Catalogue of YSOs in M33 classified using the PRF analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJmag? J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? J magnitude errormagstat.error;phot.magfloatnullableHmag? H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? H magnitude errormagstat.error;phot.magfloatnullableKmagK magnitudemagphot.mag;em.IR.Kdoublee_KmagK magnitude errormagstat.error;phot.magdoubleSFR-IDSFR identification numbermeta.idintMassEstimated YSO masssolMassphys.massfloatFlag[*] Flag (1)meta.code.errorchar