J/MNRAS/527/1066ivo://CDS.VizieR/J/MNRAS/527/10668doi:10.26093/cds/vizier/bg-gf-adcCDSPeltonen J.Rosolowsky E.Williams T.G.Koch E.W.Dolphin A.,Chastenet J.Dalcanton J.J.Ginsburg A.Johnson L.C.Leroy A.K.,Richardson T.Sandstrom K.M.Sarbadhicary S.K.Smercina A.Wainer T.,Williams B.F.2026-08-03T07:33:03Z2024-01-10T14:16:20ZCDS support team

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

cds-question@unistra.frgalaxiesyoung-stellar-objectsmillimeter-astronomyphotometrysubmillimeter-astronomyYoung stellar objects (YSOs) are the gold standard for tracing star formation in galaxies but have been unobservable beyond the Milky Way and Magellanic Clouds. But that all changed when the JWST was launched, which we use to identify YSOs in the Local Group galaxy M33, marking the first time that individual YSOs have been identified at these large distances. We present Mid-Infrared Instrument (MIRI) imaging mosaics at 5.6 and 21um that cover a significant portion of one of M33's spiral arms that has existing panchromatic imaging from the Hubble Space Telescope and deep Atacama Large Millimeter/submillimeter Array CO measurements. Using these MIRI and Hubble Space Telescope images, we identify point sources using the new DOLPHOT MIRI module. We identify 793 candidate YSOs from cuts based on colour, proximity to giant molecular clouds (GMCs), and visual inspection. Similar to Milky Way GMCs, we find that higher mass GMCs contain more YSOs and YSO emission, which further show YSOs identify star formation better than most tracers that cannot capture this relationship at cloud scales. We find evidence of enhanced star formation efficiency in the southern spiral arm by comparing the YSOs to the molecular gas mass.2024MNRAS.52710668Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/527/10668CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/527/10668https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/527/10668http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/527/10668https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/527/10668https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/527/10668http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/527/10668GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/527/10668/table1 (M33 young stellar object candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/527/10668/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/527/10668/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/527/10668/table1?GETtext/xml+votable180.050000true23.4072688930.531583890.0055555555555555566/2155https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/527/10668?format=asciiMillimeterdefaultJ/MNRAS/527/10668/table1M33 young stellar object candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA_ICRS[23.37/23.54] Right ascension (ICRS)degpos.eq.ra;meta.mainDE_ICRS[30.52/30.65] Declination (ICRS)degpos.eq.dec;meta.mainF21um[5.0/40218.54] JWST MIRI 21 micron band flux, MIRI filter F2100WuJyphot.flux.density;em.IR.15-30umdoublee_F21umUncertainty in F21umuJystat.errorfloatF5.6um[2.04/775.58] JWST MIRI 5.6 micron band flux, MIRI filter F560WuJyphot.flux.density;em.IR.4-8umfloate_F5.6umUncertainty in F5.6umuJystat.errorfloatF1.6um[0.67/26.82] HST 1.6 micron band flux, HST filter F160WuJyphot.flux.density;em.IR.Hfloate_F1.6um[0.02/0.08] Uncertainty in F1.6umuJystat.errorfloat