J/ApJ/725/2485ivo://CDS.VizieR/J/ApJ/725/2485doi:10.26093/cds/vizier.17252485CDSKuhn M.A.Getman K.V.Feigelson E.D.Reipurth B.Rodney S.A.,Garmire G.P.2018-01-30T07:18:24Z2012-08-29T13:09:28ZCDS support team

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

cds-question@unistra.fropen-star-clustersh-ii-regionsx-ray-sourcesastronomical-object-identificationinfrared-photometryyoung-stellar-objectsThe young stellar cluster illuminating the W40 HII region, one of the nearest massive star-forming regions, has been observed with the ACIS detector on board the Chandra X-ray Observatory. Due to its high obscuration, this is a poorly studied stellar cluster with only a handful of bright stars visible in the optical band, including three OB stars identified as primary excitation sources. We detect 225 X-ray sources, of which 85% are confidently identified as young stellar members of the region. Two potential distances of the cluster, 260pc and 600pc, are used in the paper.2010ApJ...725.2485Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/725/2485CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/AJ/140/968 : A cluster of compact radio sources in W40 (Rodriguez+, 2010)J/ApJS/163/306 : Chandra study of the Cep B star-forming region (Getman+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/725/2485https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/725/2485http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/725/2485https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/725/2485https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/725/2485http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/725/2485GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/725/2485/cxow40 (Chandra sources basic properties, IR and radio counterparts and X-ray spectroscopy)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/725/2485/cxow40?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/725/2485/cxow40?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/725/2485/cxow40?GETtext/xml+votable180.050000true277.69271889-2.160348060.005555555555555556Cone search capability for table J/ApJ/725/2485/table3 (Additional non X-ray cluster members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/725/2485/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/725/2485/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/725/2485/table3?GETtext/xml+votable180.050000true277.7065833-2.18822220.0055555555555555566/303418.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/725/2485?format=asciiX-rayInfrareddefaultJ/ApJ/725/2485/cxow40Chandra sources basic properties, IR and radio counterparts and X-ray spectroscopyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqX-ray catalog sequence number; RA sortedmeta.id;meta.mainintCXOW40IAU designation (HHMMSS.ss+DDMMSS.s; J2000)meta.id;meta.maincharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainePos[0/1.5] Positional error (1)arcsecstat.error;posfloatthetaOff-axis angle {theta}arcmininstr.offsetfloatNCtExtracted net counts in full band (0.5-8keV)ctphot.count;em.X-rayfloate_NCtAverage 1{sigma} error in NCtctstat.errorfloatBCtBackground counts in the extraction regionctphot.count;em.X-rayfloatHCtExtracted net counts in hard band (2-8keV)ctphot.count;em.X-rayfloatPSFPSF fraction enclosed within extraction region (2)instr.det.psf;obs.field;arith.ratiofloatSigniSource significance (3)stat.fit.goodnessfloatAnom[0/1] Source anomalies (4)meta.codeintVar[1/4] Variability characterization (5)meta.code;src.varintExpEffective exposure (6)kstime.expofloatEmedMedian energy of net counts in full (0.5-8keV) bandkeVem.energyfloat2MASS2MASS source designation ("9999999999999999" when no information)meta.id.crosscharOffset[0/2.6]? Chandra-2MASS positional offsetarcsecpos;arith.difffloatnullableJmag? 2MASS J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Error on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H-band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Error on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmag? 2MASS K_S_-band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag? Error on Ksmagmagstat.error;phot.mag;em.IR.Kfloatnullablequal2MASS photometry quality and confusion flag ("999999" when no information)meta.code.qual;photcharMmMembership class (G1)srccharAv? Visual absorption from J vs. J-H diagrammagphys.absorptionfloatnullableMass? Stellar mass from J vs. J-H diagramsolMassphys.massfloatnullablee_Mass? Error on mass from J vs. J-H diagramsolMassstat.error;phys.massfloatnullableU[0/3] UKIRT counterparts (7)meta.codeintVLA[1/20]?=-99 VLA source (Rodriguez et al. 2010, Cat. J/AJ/140/968, <[RRR2010] W40-VLA NN> in Simbad)meta.id.crossintnullable2MDisplay the 2MASS data within 3" (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharLh1? Apparent hard-band (2-8keV) luminosity from XSPEC fitlog(1e-07W)phys.luminosity;em.X-rayfloatnullableLt1? Apparent full-band (0.5-8keV) luminosity from XSPEC fitlog(1e-07W)phys.luminosity;em.X-rayfloatnullablekT1? Plasma temperature inferred from XSPEC fitkeVphys.temperaturefloatnullableNH1? Column density inferred from XSPEC fitlog(cm**-2)phys.columnDensityfloatnullableLhc1? Intrinsic hard-band (2-8keV) luminosity from XSPEC fitlog(1e-07W)phys.luminosity;em.X-rayfloatnullableLtc1? Intrinsic full-band (0.5-8keV) luminosity from XSPEC fitlog(1e-07W)phys.luminosity;em.X-rayfloatnullableNH2? H_2_ column density obtained from XPHOTlog(cm**-2)phys.columnDensityfloatnullablee_NH2? Error on NH2log(cm**-2)stat.error;phys.columnDensityfloatnullableLhc2? Intrinsic hard-band (2-8keV) luminosity from XPHOTlog(1e-07W)phys.luminosity;em.X-rayfloatnullablee_Lhc2? Error on Lhc2log(1e-07W)stat.errorfloatnullableLtc2? Intrinsic full-band (0.5-8keV) luminosity from XPHOTlog(1e-07W)phys.luminosity;em.X-rayfloatnullablee_Ltc2? Error on Ltc2log(1e-07W)stat.errorfloatnullableJ/ApJ/725/2485/table3Additional non X-ray cluster membersName2MASS name (HHMMSSss+DDMMSSs) or OS 3ameta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJmag2MASS J-band magnitudemagphot.mag;em.IR.Jfloate_JmagJmag uncertaintymagstat.error;phot.mag;em.IR.JfloatHmag2MASS H-band magnitudemagphot.mag;em.IR.Hfloate_HmagHmag uncertaintymagstat.error;phot.mag;em.IR.HfloatKsmag2MASS Ks-band magnitudemagphot.mag;em.IR.Kfloate_KsmagKsmag uncertaintymagstat.error;phot.mag;em.IR.Kfloatqual2MASS photometry quality and confusion flagmeta.code.qual;photcharAvVisual absorption (1)magphys.absorption;em.opt.VfloatMassStellar mass (1)solMassphys.massfloate_MassMass uncertaintysolMassstat.error;phys.massfloat2MDisplay the 2MASS data within 3" (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from 2MASS name or SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS name or SIMBAD database (declination part)degpos.eq.dec;meta.main