J/ApJ/827/96ivo://CDS.VizieR/J/ApJ/827/96doi:10.26093/cds/vizier.18270096CDSFischer W.J.Padgett D.L.Stapelfeldt K.L.Sewilo M.2018-10-08T11:57:16Z2017-01-04T13:01:16ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinfrared-photometryWith the Wide-field Infrared Survey Explorer (WISE), we searched for young stellar objects (YSOs) in a 100deg^2^ region centered on the lightly studied Canis Major star-forming region. Applying stringent magnitude cuts to exclude the majority of extragalactic contaminants, we find 144 Class I candidates and 335 Class II candidates. The sensitivity to Class II candidates is limited by their faintness at the distance to Canis Major (assumed as 1000pc). More than half the candidates (53%) are found in 16 groups of more than four members, including four groups with more than 25 members each. The ratio of Class II to Class I objects, N_II_/N_I_, varies from 0.4 to 8.3 in just the largest four groups. We compare our results to those obtainable with combined Two Micron All Sky Survey and post-cryogenic Spitzer Space Telescope data; the latter approach recovers missing Class II sources. Via a comparison to protostars characterized with the Herschel Space Observatory, we propose new WISE color criteria for flat-spectrum and Class 0 protostars, finding 80 and 7 of these, respectively. The distribution of YSOs in CMa OB1 is consistent with supernova-induced star formation, although the diverse N_II_/N_I_ ratios are unexpected if this parameter traces age and the YSOs are due to the same supernova. Less massive clouds feature larger N_II_/N_I_ ratios, suggesting that initial conditions play a role in determining this quantity.2016ApJ...827...96Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/827/96CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/328 : AllWISE Data Release (Cutri+ 2013)II/311 : WISE All-Sky Data Release (Cutri+ 2012)J/ApJS/224/5 : Herschel Orion Protostar Survey (HOPS): SEDs (Furlan+, 2016)J/AJ/150/100 : WISE YSO cand. near {sigma} and {lambda} Ori (Koenig+, 2015)J/ApJ/787/107 : Spatial structure of young stellar clusters. I. (Kuhn+, 2014)J/ApJ/772/45 : Hi-GAL obs.: star formation in the 3rd quadrant (Elia+, 2013)J/ApJ/767/36 : APEX observations of HOPS protostars (Stutz+, 2013)J/AJ/145/94 : Protostar luminosities from 2 Spitzer surveys (Dunham+, 2013)J/A+A/547/A49 : Herschel EPoS: high-mass overview (Ragan+, 2012)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/ApJ/693/L81 : Extinction in star-forming regions (McClure, 2009)J/PASJ/56/313 : 13CO survey of Mon + CMa molecular clouds (Kim+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/827/96https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/827/96http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/827/96https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/827/96https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/827/96http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/827/96GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/827/96/table1 (WISE YSO candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/827/96/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/827/96/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/827/96/table1?GETtext/xml+votable180.050000true101.75103-9.995810.0055555555555555565/5409 5411 5417 5418 5419 5422 6/20948 20952 20977 20981 20983 21515 21518 21537 21539 21540 21542 21548 21550 21551 21560 21562 21633 21634 21635 21641 21642 21643 21648 21649 21651 21653 21657 21658 21659 21660 21662 21665 21666 21667 21680 21681 21683 21684 21685 22020 22021 22023 220328.157980699529898e-21 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/827/96?format=asciiInfrareddefaultJ/ApJ/827/96/table1WISE YSO candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWISEAWISE identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainJmag[9.3/18.8]? 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.02/0.3]? Uncertainty in Jmag (1)magstat.error;phot.mag;em.IR.JfloatnullableHmag[8.3/17.5]? 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.02/0.3]? Uncertainty in Hmag (1)magstat.error;phot.mag;em.IR.HfloatnullableKsmag[7.4/15.2]? 2MASS K_s_ band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag[0.01/0.2]? Uncertainty in Ksmag (1)magstat.error;phot.mag;em.IR.Kfloatnullable3.4mag[6.3/18.6] WISE W1 3.4 micron band magnitudemagphot.mag;em.IR.3-4umfloate_3.4mag[0.01/0.6] Uncertainty in 3.4magmagstat.errorfloat4.6mag[4.4/14.4] WISE W2 4.6 micron band magnitudemagphot.mag;em.IR.4-8umfloate_4.6mag[0.01/0.2] Uncertainty in 4.6magmagstat.errorfloat12mag[1.5/11.7] WISE W3 12 micron band magnitudemagphot.flux.density;em.IR.8-15umfloate_12mag[0.01/0.5]? Uncertainty in 12mag (1)magstat.errorfloatnullable22mag[0.2/8.9] WISE W4 22 micron band magnitudemagphot.flux.density;em.IR.15-30umfloate_22mag[0.005/0.5]? Uncertainty in 22mag (1)magstat.errorfloatnullableClassYSO classification ("I": 144 sources or "II": 335 sources)src.classcharQQuality code from visual inspection (2)meta.code.qualchar2MDisplay the 2MASS data (Cutri+ 2003, II/246) within 1"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar