J/ApJ/779/113ivo://CDS.VizieR/J/ApJ/779/113doi:10.26093/cds/vizier.17790113CDSMallick K.K.Kumar M.S.N.Ojha D.K.Bachiller R.Samal M.R.Pirogov L.2015-09-16T14:29:37Z2015-06-12T10:25:39ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinfrared-photometryh-ii-regionsWe present a multiwavelength study of the W40 star-forming region using infrared (IR) observations in the UKIRT JHK bands, Spitzer Infrared Array Camera bands, and Herschel PACS bands, 2.12{mu}m H_2_ narrowband imaging, and radio continuum observations from GMRT (610 and 1280MHz), in a field of view (FoV) of ~34'x40'. Archival Spitzer observations in conjunction with near-IR observations are used to identify 1162 Class II/III and 40 Class I sources in the FoV. The nearest-neighbor stellar surface density analysis shows that the majority of these young stellar objects (YSOs) constitute the embedded cluster centered on the high-mass source IRS 1A South. Some YSOs, predominantly the younger population, are distributed along and trace the filamentary structures at lower stellar surface density. The cluster radius is measured to be 0.44pc -- matching well with the extent of radio emission -- with a peak density of 650/pc2. The JHK data are used to map the extinction in the region, which is subsequently used to compute the cloud mass -- 126M_{sun}_ and 71M_{sun}_ for the central cluster and the northern IRS 5 region, respectively. H_2_ narrowband imaging shows significant emission, which prominently resembles fluorescent emission arising at the borders of dense regions. Radio continuum analysis shows that this region has a blister morphology, with the radio peak coinciding with a protostellar source. Free-free emission spectral energy distribution analysis is used to obtain physical parameters of the overall photoionized region and the IRS 5 sub-region.2013ApJ...779..113Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/779/113CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVI/139 : Herschel Observation Log (Herschel Science Centre, 2013)II/316 : UKIDSS-DR6 Galactic Plane Survey (Lucas+ 2012)VII/244 : Atlas and Catalog of Dark Clouds (Dobashi+, 2005)II/332 : c2d Spitzer final data release (DR4) (Evans+, 2003)VIII/64 : Westerhout's Catalogue of 82 Discrete Sources (Westerhout 1958)J/ApJS/209/29 : MYStIX: Mid-IR observations and catalogs (Kuhn+, 2013)J/A+A/527/A62 : HK photometry in an UCHII region near Sh2-217 (Brand+, 2011)J/ApJ/725/2485 : X-rays from the star-forming complex W40 (Kuhn+, 2010)J/AJ/140/968 : A cluster of compact radio sources in W40 (Rodriguez+, 2010)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/MNRAS/396/964 : T Tauri in and around bright-rimmed clouds (Chauhan+, 2009)J/ApJ/682/445 : Spitzer observations of S254-S258 (Chavarria+, 2008)J/A+A/463/1029 : DCld303-14.8 + Thumbprint Nebula JHKs (Kainulainen+, 2007)J/ApJ/653/1226 : Physical properties of galactic HII regions (Quireza+, 2006)J/MNRAS/362/689 : AAO/UKST SuperCOSMOS H{alpha} survey (Parker+, 2005)J/ApJS/155/123 : JHKs photometry of ultracompact HII regions (Alvarez+, 2004)J/other/AuJPA/14.133 : Galactic radio sources. III. (shaver+ 1970)J/other/AuJPA/14.1 : 5000MHz galactic radio sources (Goss+, 1970)http://irsa.ipac.caltech.edu/data/SPITZER/C2D/ : C2D Spitzer NASA/IPAC archivehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/779/113https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/779/113http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/779/113https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/779/113https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/779/113http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/779/113GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/779/113/table2 (YSOs identified in the field of view (FoV))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/779/113/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/779/113/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/779/113/table2?GETtext/xml+votable180.050000true277.63562-2.305891110.0055555555555555566/30341 30343 30352 303542.0616683193919197e-20 1.6867587740958882e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/779/113?format=asciiInfrareddefaultJ/ApJ/779/113/table2YSOs identified in the field of view (FoV)Kmag[4.8/16.4]? UKIRT/WFCAM K band magnitude in MKO system (1)magphot.mag;em.IR.KfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainJmag[7.1/20]? UKIRT/WFCAM J band magnitude in MKO systemmagphot.mag;em.IR.Jfloatnullablee_Jmag[0.001/0.09]? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? UKIRT/WFCAM H band magnitude in MKO system (1)magphot.mag;em.IR.Hfloatnullablee_Hmag? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.Hfloatnullablee_Kmag[0.001/0.2]? Uncertainty in Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6][4.9/15.4]? Spitzer/IRAC 3.6um band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6][0.001/0.5]? 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.4-8umfloatnullablee_[5.8]? Uncertainty in [5.8]magstat.errorfloatnullable[8.0][3.8/12.5]? Spitzer/IRAC 8.0um band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0][0.001/0.6]? Uncertainty in [8.0]magstat.errorfloatnullableClassYSO classification ("1" for Class-I, and "2" for Class II/III sources)src.classcharUKIDSSSources within 0.5" from UKIDSS-DR6 (II/316)meta.ref.urlintnullable