J/MNRAS/439/3719ivo://CDS.VizieR/J/MNRAS/439/3719doi:10.26093/cds/vizier.74393719CDSChavarria L.Allen L.Brunt C.Hora J.L.Muench A.Fazio G.2024-08-08T20:12:50Z2018-12-12T12:27:39ZCDS support team

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

cds-question@unistra.frh-ii-regionsyoung-stellar-objectsinfrared-photometryWe present Spitzer, near-IR (NIR) and millimetre observations of the massive star-forming regions W5-east, S235, S252, S254-S258 and NGC 7538. Spitzer data is combined with NIR observations to identify and classify the young population while ^12^CO and ^13^CO observations are used to examine the parental molecular cloud. We detect in total 3021 young stellar objects (YSOs). Of those, 539 are classified as Class I, and 1186 as Class II sources. YSOs are distributed in groups surrounded by a more scattered population. Class I sources are more hierarchically organized than Class II and associated with the most dense molecular material. We identify in total 41 embedded clusters containing between 52 and 73 per cent of the YSOs. Clusters are in general non-virialized, turbulent and have star formation efficiencies between 5 and 50 per cent. We compare the physical properties of embedded clusters harbouring massive stars (MEC) and low-mass embedded clusters (LEC) and find that both groups follow similar correlations where the MEC are an extrapolation of the LEC. The mean separation between MEC members is smaller compared to the cluster Jeans length than for LEC members. These results are in agreement with a scenario where stars are formed in hierarchically distributed dusty filaments where fragmentation is mainly driven by turbulence for the more massive clusters. We find several young OB-type stars having IR-excess emission which may be due to the presence of an accretion disc.2014MNRAS.439.3719Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/439/3719CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/439/3719https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/439/3719http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/439/3719https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/439/3719https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/439/3719http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/439/3719GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/439/3719/table2 (Identified YSOs per region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/439/3719/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/439/3719/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/439/3719/table2?GETtext/xml+votable180.050000true45.0901488960.301571110.0055555555555555566/3279 3290 3312 14316-14317 23968-23969 23980 23982 245542.483060040379131e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/439/3719?format=asciiInfrareddefaultJ/MNRAS/439/3719/table2Identified YSOs per regionSimbadNameSimbad column added by the CDSmeta.idcharRegionRegion namemeta.id;obs.fieldcharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/3021] Sequential numbermeta.recordintJmag? J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.magfloatnullableHmag? H-band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.magfloatnullableKmag? K-band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.magfloatnullableIRAC1? IRAC ch1 (3.4um) magnitudemagphot.mag;em.IR.3-4umfloatnullablee_IRAC1? rms uncertainty on IRAC1magstat.errorfloatnullableIRAC2? IRAC ch2 (4.5um) magnitudemagphot.mag;em.IR.4-8umfloatnullablee_IRAC2? rms uncertainty on IRAC2magstat.errorfloatnullableIRAC3? IRAC ch3 (5.8um) magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_IRAC3? rms uncertainty on IRAC3magstat.errorfloatnullableIRAC4? IRAC ch4 (8.0um) magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_IRAC4? rms uncertainty on IRAC4magstat.errorfloatnullableClass[1/2]? YSO class (1.0 or 2.0) (1)meta.code.classfloatnullablealpha? YSO IRAC alpha indexspect.indexfloatnullableSchemaYSO classification scheme used (IRAC, HK2, NIR or MIPS)meta.codechar