J/ApJ/752/127ivo://CDS.VizieR/J/ApJ/752/127doi:10.26093/cds/vizier.17520127CDSMasiunas L.C.Gutermuth R.A.Pipher J.L.Megeath S.T.Myers P.C.,Allen L.E.Kirk H.M.Fazio G.G.2017-10-16T14:57:50Z2014-03-04T10:04:33ZCDS support team

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

cds-question@unistra.frinfrared-photometryyoung-stellar-objectsstellar-associationsWe present Spitzer IRAC and MIPS observations of the star-forming region containing intermediate-mass young stellar object (YSO) AFGL 490. We supplement these data with near-IR Two Micron All Sky Survey photometry and with deep Simultaneous Quad Infrared Imaging Device observations off the central high-extinction region. We have more than doubled the known membership of this region to 57 Class I and 303 Class II YSOs via the combined 1-24{mu}m photometric catalog derived from these data. We construct and analyze the minimum spanning tree of their projected positions, isolating one locally overdense cluster core containing 219 YSOs (60.8% of the region's members). We find this cluster core to be larger yet less dense than similarly analyzed clusters. Although the structure of this cluster core appears irregular, we demonstrate that the parsec-scale surface densities of both YSOs and gas are correlated with a power-law slope of 2.8, as found for other similarly analyzed nearby molecular clouds. We also explore the mass segregation implications of AFGL 490's offset from the center of its core, finding that it has no apparent preferential central position relative to the low-mass members.2012ApJ...752..127Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/752/127CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJ/727/64 : Young stellar groups & their most massive stars (Kirk+, 2011)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)J/BaltA/17/1 : IR photometry in GL490 star-forming region (Straizys+ 2008)J/AJ/126/1916 : JHK photometry of young clusters near the Sun (Porras+, 2003)J/ApJS/94/615 : Molecular outflow sources (Hodapp, 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/752/127https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/752/127http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/752/127https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/752/127https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/752/127http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/752/127GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/752/127/table1 (Spitzer-identified YSOs in AFGL490 region: IRAC, MIPS, and near-IR magnitudes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/752/127/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/752/127/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/752/127/table1?GETtext/xml+votable180.050000true51.814558.83350.0055555555555555566/3195 3198 32846.772611666688002e-21 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/752/127?format=asciiInfrareddefaultJ/ApJ/752/127/table1Spitzer-identified YSOs in AFGL490 region: IRAC, MIPS, and near-IR magnitudesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqYSO index number; <[GMM2009] AFGL490 NNN> in Simbadmeta.id;meta.mainintRAJ2000[3] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[58/59] Degree of Declination (J2000)pos.eq.dec;meta.mainJmag[11.2/19.3]? 2MASS or SQIID J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.01/0.2]? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag[10.6/18.8]? 2MASS or SQIID H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag[9.4/17.2]? 2MASS or SQIID Ks band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? Uncertainty in Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6][7.3/17] Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloate_[3.6][0.01/0.2] Uncertainty in [3.6]magstat.errorfloat[4.5][6.4/15.4] Spitzer/IRAC 4.5{mu}m band magnitudemagphot.mag;em.IR.4-8umfloate_[4.5]Uncertainty in [4.5]magstat.errorfloat[5.8][5.9/14.8]? Spitzer/IRAC 5.8{mu}m band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? Uncertainty in [5.8]magstat.errorfloatnullable[8.0][5/13.9]? Spitzer/IRAC 8.0{mu}m band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? Uncertainty in [8.0]magstat.errorfloatnullable[24][0.3/9.8]? Spitzer/MIPS 24{mu}m band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_[24][0.01/0.2]? Uncertainty in [24]magstat.errorfloatnullableAK[0/4.2]? The Ks band extinction (1)magphys.absorptionfloatnullablealpha[-2.6/4.1]? Spectral index {alpha} of IRAC bands (2)spect.indexfloatnullableG09[ *I] Gutermuth et al. 2009, Cat. J/ApJS/184/18, classification (3)src.classcharClassClassification from this work (same classification as G09 + "Field star") (3)src.classchar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246) within 3"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar