J/ApJ/743/166ivo://CDS.VizieR/J/ApJ/743/166doi:10.26093/cds/vizier.17430166CDSWinston E.Wolk S.J.Bourke T.L.Megeath S.T.Gutermuth R.,Spitzbart B.2018-01-08T10:04:22Z2013-04-26T13:32:39ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsinfrared-photometryx-ray-sourcesWe present a study of the structure of the high-mass star-forming region RCW 38 and the spatial distribution of its young stellar population. Spitzer Infrared Array Camera (IRAC) photometry (3-8um) is combined with Two Micron All Sky Survey near-IR data to identify young stellar objects (YSOs) by IR-excess emission from their circumstellar material. Chandra X-ray data are used to identify class III pre-main-sequence stars lacking circumstellar material. We identify 624 YSOs: 23 class 0/I and 90 flat spectrum protostars, 437 class II stars, and 74 class III stars. We also identify 29 (27 new) O star candidates over the IRAC field. Seventy-two stars exhibit IR-variability, including 7 class 0/I and 12 flat spectrum YSOs. A further 177 tentative candidates are identified by their location in the IRAC [3.6] versus [3.6]-[5.8] color-magnitude diagram. We find strong evidence of subclustering in the region.2011ApJ...743..166Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/743/166CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/132/1100 : X-ray and IR sources in RCW 38 (Wolk+, 2006)J/AJ/138/33 : VLT JHKs imaging of RCW 38 (Derose+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/743/166https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/743/166http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/743/166https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/743/166https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/743/166http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/743/166GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/743/166/table2 (RCW 38: Chandra X-ray source photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/166/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/166/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/166/table2?GETtext/xml+votable180.050000true134.9815833-47.47466670.005555555555555556Cone search capability for table J/ApJ/743/166/peculiar (Combined table from original tables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/166/peculiar?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/166/peculiar?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/166/peculiar?GETtext/xml+votable180.050000true134.619-47.650250.005555555555555556Cone search capability for table J/ApJ/743/166/sources (Astrometry and photometry in RCW 38 {(tables 3 and 4 of paper)})https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/166/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/166/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/166/sources?GETtext/xml+votable180.050000true134.7744167-47.60816940.005555555555555556Cone search capability for table J/ApJ/743/166/table5 (Photometry of the candidate YSOs in RCW 38 (with [3.6] versus [3.6-5.8]))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/166/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/166/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/166/table5?GETtext/xml+votable180.050000true134.880125-47.58928610.0055555555555555566/37861 378722.0616683193919197e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/743/166?format=asciiInfraredX-raydefaultJ/ApJ/743/166/table2RCW 38: Chandra X-ray source photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDX[1/536] Chandra identification numbermeta.id;meta.mainintirexistence of IR counterparts in the Spitzer sources (r<1.5")meta.numberintnullableRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainRCtsRaw countsct/sphot.count;em.X-rayfloatNCtsNet counts (1)ct/sphot.count;em.X-rayfloatNH? HI column density1e+22cm**-2phys.columnDensityfloatnullablee_NH? Uncertainty in NH1e+22cm**-2stat.errorfloatnullablekT? EnergykeVem.energyfloatnullablee_kT? Uncertainty in kTkeVstat.error;phys.energyfloatnullableFabs? Absorbed flux; in erg/cm^2^/smW.m**-2phot.flux;em.X-raydoublenullableFtot? Total unabsorbed flux; in erg/cm^2^/smW.m**-2phot.flux;em.X-raydoublenullablechi2? Model {chi}^2^stat.fit.chi2floatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/743/166/peculiarCombined table from original tablesSimbadNameSimbad column added by the CDSmeta.idcharNameSpitzer identifier (1)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTsrc.classcharEp[1/4] Epoch identifiermeta.idintMSpitzer counterpartsmeta.numberintnullableRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJmag? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? 2MASS Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6]? Spitzer/IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? rms uncertainty on [3.6]magstat.errorfloatnullable[4.5]? Spitzer/IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? rms uncertainty on [4.5]magstat.errorfloatnullable[5.8]? Spitzer/IRAC 5.8um magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? rms uncertainty on [5.8]magstat.errorfloatnullable[8.0]? Spitzer/IRAC 8.0um magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? rms uncertainty on [8.0]magstat.errorfloatnullableAK? The Ks band extinctionmagphys.absorptionfloatnullableClassYSO Class (only for table6) (G1)src.classchar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharJ/ApJ/743/166/sourcesAstrometry and photometry in RCW 38 {(tables 3 and 4 of paper)}e_[5.8]? Uncertainty in [5.8]magstat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClassYSO class (G1)src.classcharID[1/814] Spitzer identifiermeta.id;meta.mainintprimaryXexistence of X-ray counterparts in the Chandra sources (r<1.5")meta.numberintnullableEp[1/4] Epoch identifiermeta.idintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainNoteX-ray and/or variable source (2)meta.notecharppeculiar star (variable and/or O-star and/or 24{mu}m emission)meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharTypeYSO typesrc.classcharJmag? 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? 2MASS Ks band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? Uncertainty in Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6]? Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? Uncertainty in [3.6]magstat.errorfloatnullable[4.5]? Spitzer/IRAC 4.5 micron band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? Uncertainty in [4.5]magstat.errorfloatnullable[5.8]? Spitzer/IRAC 5.8 micron band magnitudemagphot.flux.density;em.IR.4-8umfloatnullable[8.0]? Spitzer/IRAC 8.0 micron band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? Uncertainty in [8.0]magstat.errorfloatnullablealpha? Spectral index of the IRAC band dataspect.indexfloatnullableAK? The Ks band extinctionmagphys.absorptionfloatnullable2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharJ/ApJ/743/166/table5Photometry of the candidate YSOs in RCW 38 (with [3.6] versus [3.6-5.8])recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[605/802] Spitzer identifiermeta.id;meta.mainintprimaryEp[1/4] Epoch identifiermeta.idintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJmag? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? 2MASS Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6]? Spitzer/IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? rms uncertainty on [3.6]magstat.errorfloatnullable[4.5]? Spitzer/IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? rms uncertainty on [4.5]magstat.errorfloatnullable[5.8]? Spitzer/IRAC 5.8um magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? rms uncertainty on [5.8]magstat.errorfloatnullable[8.0]? Spitzer/IRAC 8.0um magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? rms uncertainty on [8.0]magstat.errorfloatnullable2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar