J/ApJ/794/124ivo://CDS.VizieR/J/ApJ/794/124doi:10.26093/cds/vizier.17940124CDSRapson V.A.Pipher J.L.Gutermuth R.A.Megeath S.T.Allen T.S.,Myers P.C.Allen L.E.2017-06-06T07:38:34Z2017-05-16T15:52:53ZCDS support team

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

cds-question@unistra.frmolecular-cloudsyoung-stellar-objectsinfrared-photometryinfrared-sourcesWe present Spitzer 3.6, 4.5, 5.8, 8.0, and 24 {mu}m images of the Mon OB1 East giant molecular cloud, which contains the young star forming region NGC 2264, as well as more extended star formation. With Spitzer data and Two Micron All Sky Survey photometry, we identify and classify young stellar objects (YSOs) with dusty circumstellar disks and/or envelopes in Mon OB1 East by their infrared-excess emission and study their distribution with respect to cloud material. We find a correlation between the local surface density of YSOs and column density of molecular gas as traced by dust extinction that is roughly described as a power law in these quantities. NGC 2264 follows a power-law index of ~2.7, exhibiting a large YSO surface density for a given gas column density. Outside of NGC 2264 where the surface density of YSOs is lower, the power law is shallower and the region exhibits a larger gas column density for a YSO surface density, suggesting the star formation is more recent. In order to measure the fraction of cloud members with circumstellar disks/envelopes, we estimate the number of diskless pre-main-sequence stars by statistical removal of background star detections. We find that the disk fraction of the NGC 2264 region is 45%, while the surrounding, more distributed regions show a disk fraction of 19%. This may be explained by the presence of an older, more dispersed population of stars. In total, the Spitzer observations provide evidence for heterogenous, non-coeval star formation throughout the Mon OB1 cloud.2014ApJ...794..124Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/794/124CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/642/972 : IR photometry of a star-forming core in NGC 2264 (Young+, 2006)J/AJ/135/441 : VRIH{alpha} photometry in NGC 2264 (Sung+, 2008)J/AJ/138/1116 : A Spitzer view of NGC 2264 (Sung+, 2009)J/ApJ/741/35 : NIR photometry and polarization in NGC 2264 (Kwon+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/794/124https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/794/124http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/794/124https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/794/124https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/794/124http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/794/124GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/794/124/table1 (Catalog of sources detected with Spitzer Space Telescope IRAC and MIPS instruments which are classified as potential YSOs/field stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/794/124/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/794/124/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/794/124/table1?GETtext/xml+votable180.050000true100.81158.749550.0055555555555555565/5909 6/22270 22271 23810 238166.772611666688002e-21 6.185923063528282e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/794/124?format=asciiInfrareddefaultJ/ApJ/794/124/table1Catalog of sources detected with Spitzer Space Telescope IRAC and MIPS instruments which are classified as potential YSOs/field starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource identifier (NNNNN)meta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.main3.6mag? Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_3.6mag? Uncertainty in 3.6magmagstat.errorfloatnullable4.5mag? Spitzer/IRAC 4.5 micron band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_4.5mag? Uncertainty in 4.5magmagstat.errorfloatnullable5.8mag? Spitzer/IRAC 5.8 micron band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_5.8mag? Uncertainty in 5.8magmagstat.errorfloatnullable8mag? Spitzer/IRAC 8 micron band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_8mag? Uncertainty in 8magmagstat.errorfloatnullable24mag? Spitzer/MIPS 24 micron band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_24mag? Uncertainty in 24magmagstat.errorfloatnullableClassSource classification (1)meta.code.classcharOClassOther source classification (2)meta.code.classchar