J/ApJ/654/338ivo://CDS.VizieR/J/ApJ/654/338doi:10.26093/cds/vizier.16540338CDSRuch G.T.Jones T.J.Woodward C.E.Polomski E.F.Gehrz R.D.,Megeath S.T.2009-02-05T10:32:30Z2009-02-05T11:28:02ZCDS support team

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

cds-question@unistra.frmolecular-cloudspre-main-sequence-starsinfrared-photometryWe present new images of the giant molecular cloud W3 obtained with the Infrared Array Camera (IRAC) and the Multiband Imaging Photometer for Spitzer (MIPS) on board the Spitzer Space Telescope. The images encompass the star forming regions W3 Main, W3(OH), and a region that we refer to as the Central Cluster, which encloses the emission nebula IC 1795. We present a star count analysis of the point sources detected in W3. The star count analysis shows that the stellar population of the Central Cluster, when compared to that in the background, contains an over density of sources. The Central Cluster also contains an excess of sources with colors consistent with Class II young stellar objects (YSOs). An analysis of the color-color diagrams also reveals a large number of Class II YSOs in the Central Cluster. Our results suggest that an earlier epoch of star formation created the Central Cluster, created a cavity, and triggered the active star formation in the W3 Main and W3(OH) regions. We also detect a new outflow and its candidate exciting star.2007ApJ...654..338Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/654/338CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/654/338https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/654/338http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/654/338https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/654/338https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/654/338http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/654/338GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/654/338/table3 (IRAC magnitudes of sources detected in all 4 bands)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/654/338/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/654/338/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/654/338/table3?GETtext/xml+votable180.050000true36.16257562.05802190.0055555555555555566/3649https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/654/338?format=asciiInfrareddefaultJ/ApJ/654/338/table3IRAC magnitudes of sources detected in all 4 bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[RJW2007]The IRAC identification numbermeta.id;meta.mainint2MASSThe 2MASS identification number (HHMMSSss+DDMMSSs)meta.idchar3.6magThe IRAC 3.6 micron magnitudemagphot.flux.density;em.IR.3-4umfloate_3.6magUncertainty in 3.6magmagstat.errorfloat4.5magThe IRAC 4.5 micron magnitudemagphot.mag;em.IR.4-8umfloate_4.5magUncertainty in 4.5magmagstat.errorfloat5.8magThe IRAC 5.8 micron magnitudemagphot.flux.density;em.IR.4-8umfloate_5.8magUncertainty in 5.8magmagstat.errorfloat8.0magThe IRAC 8.0 micron magnitudemagphot.flux.density;em.IR.8-15umfloate_8.0magUncertainty in 8.0magmagstat.errorfloat24mag? The MIPS 24.0 micron magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_24mag? Uncertainty in 24.0magmagstat.errorfloatnullableRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.main