J/ApJS/269/9ivo://CDS.VizieR/J/ApJS/269/9doi:10.26093/cds/vizier.22690009CDSGuarcello M.G.Drake J.J.Wright N.J.Naylor T.Flaccomio E.,Kashyap V.L.Garcia-Alvarez D.2024-11-06T20:30:41Z2024-02-28T08:20:16ZCDS support team

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

cds-question@unistra.frx-ray-sourcesastronomical-object-identificationinfrared-photometryvisible-astronomybroad-band-photometrystellar-spectral-typesstellar-massesstellar-agesextinctionThe young massive OB association Cygnus OB2, in the Cygnus X complex, is the closest (~1400pc) star-forming region to the Sun hosting thousands of young low-mass stars and up to 1000 OB stars, among which are some of the most massive stars known in our Galaxy. This region holds great importance for several fields of modern astrophysics, such as the study of the physical properties of massive and young low-mass stars and the feedback provided by massive stars on star and planet formation processes. Cyg OB2 has been recently observed with Chandra/ACIS-I as part of the 1.08Ms Chandra Cygnus OB2 Legacy Project. This survey detected 7924 X-ray sources in a square degree area centered on Cyg OB2. Since a proper classification and study of the observed X-ray sources also requires the analysis of their optical and infrared counterparts, we combined a large and deep set of optical and infrared catalogs available for this region with our new X-ray catalog. In this paper we describe the matching procedure and present the combined catalog containing 5703 sources. We also briefly discuss the nature of the X-ray sources with optical and infrared counterparts using their position in the color-magnitude and color-color diagrams.2023ApJS..269....9Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/269/9CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/306 : The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)II/316 : UKIDSS-DR6 Galactic Plane Survey (Lucas+ 2012)II/321 : IPHAS DR2 Source Catalogue (Barentsen+, 2014)V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)J/AJ/101/1408 : Massive stars in Cyg OB2. (Massey+ 1991)J/A+A/464/211 : Chandra and NIR obs. of Cyg OB2 (Albacete Colombo+, 2007)J/ApJ/663/320 : IR-through-UV extinction curve (Fitzpatrick+, 2007)J/MNRAS/380/1467 : AGN in supercluster A901/2 (Gilmour+, 2007)J/ApJS/169/401 : ChaMP X-ray point source catalog (Kim+, 2007)J/ApJS/184/84 : X-ray sources in Cyg OB2 region (Wright+, 2009)J/ApJ/720/679 : Optical spectroscopy in Cygnus X region (Beerer+, 2010)J/A+A/521/A18 : Blue stars with disk phot. in NGC 6611 (Guarcello+, 2010)J/ApJ/713/871 : Star-forming region Cyg-OB2 from X-ray (Wright+, 2010)J/ApJS/202/19 : riz photometry in Cyg OB2 (Guarcello+, 2012)J/ApJ/773/135 : Disk-bearing stars in Cygnus OB2 (Guarcello+, 2013)J/ApJS/209/28 : MYStIX Wide-Field NIR data: crowded fields (King+, 2013)J/ApJS/209/30 : MYStIX project: Bayesian matching (Naylor+, 2013)J/MNRAS/443/2907 : 3D extinction map of northern Galactic plane (Sale+, 2014)J/MNRAS/449/741 : The massive star population of Cygnus OB2 (Wright+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/269/9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/269/9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/269/9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/269/9https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/269/9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/269/9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/269/9/tablea1 (Main table of the merged optical, infrared, and X-rays catalog of Cygnus OB2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/269/9/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/269/9/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/269/9/tablea1?GETtext/xml+votable180.050000true307.5313741.467820.005555555555555556Cone search capability for table J/ApJS/269/9/tablea2 (Secondary table of the merged optical, infrared, and X-rays catalog of Cygnus OB2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/269/9/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/269/9/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/269/9/tablea2?GETtext/xml+votable180.050000true307.5313441.467568060.0055555555555555566/14670-14671 14692-146946.772611666688002e-21 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/269/9?format=asciiX-rayOpticalInfrareddefaultJ/ApJS/269/9/tablea1Main table of the merged optical, infrared, and X-rays catalog of Cygnus OB2ID[1/5712] Progressive number ID (ID)meta.idintprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[WDG2023][1/7922] X-ray source ID in Wright+ 2023, J/ApJS/269/7 catalog (CXO_ID)meta.id;meta.mainintSpTSource spectral type based on spectroscopic studies (SPT)src.spTypecharRAJ2000[307.5/310] Source right ascension (J2000) (RA)degpos.eq.ra;meta.mainDEJ2000[40.6/42] Source declination (J2000) (DEC)degpos.eq.dec;meta.mainAv[0.05/29.5]? Individual extinction in the V band for members calculated adopting the Fukugita+ 1996AJ....111.1748F extinction law in SDSS bands (AV)magphys.absorption;em.opt.Vfloatnullablee_Av[0.01/91]? Av uncertainty (AV_ERR)magstat.errorfloatnullablef_AvTag explaining how A_V_ is calculated (AV_TAG) (1)meta.codecharMass[0.1/110]? Source mass calculated adopting the Fukugita+ 1996AJ....111.1748F extinction law in SDSS bands (MASS)solMassphys.massfloatnullablelogAge[0.1/9.1]? Log of source age calculated adopting the Fukugita+ 1996AJ....111.1748F extinction law in SDSS bands (AGE)log(Myr)time.age;meta.modelleddoublenullablelogLum[-1.7/6.2]? Log of luminosity (LOGL)log(solLum)phys.luminosityfloatnullableDiskTag indicating whether the source has a disk (DISK) (2)meta.notecharr_SpTReference for spectral classification (SPT_TAG) (3)meta.ref;pos.framecharAvF07[0.07/29]? Individual extinction in the V band for members calculated adopting the Fitzpatrick & Massa 2007, J/ApJ/663/320 extinction law in SDSS bands (AV_FITZ)magphys.absorption;em.opt.Vfloatnullablee_AvF07[0.02/39]? AvF07 uncertainty (AV_ERR_FITZ)magstat.errorfloatnullableMassF07[0.1/110]? Source mass calculated adopting the Fitzpatrick & Massa 2007, J/ApJ/663/320 extinction law in SDSS bands (MASS_FITZ)solMassphys.massfloatnullablelogAgeF07[0.1/9.1]? Log of source age calculated adopting the Fitzpatrick & Massa 2007, J/ApJ/663/320 extinction law in SDSS bands (AGE_FITZ)log(Myr)time.age;meta.modelleddoublenullablelogLF07[-1.7/7]? log of luminosity with F07 extinction law (LOGL_FITZ)log(solLum)phys.luminosityfloatnullableumag[15.9/26.8]? Magnitude in SDSS u band (MAGU)magphot.mag;em.opt.Ufloatnullablee_umag[0.01/14]? Uncertainty on umag (ERRMAGU)magstat.error;phot.magdoublenullablegmag[14.5/26.4]? Magnitude in SDSS g-band (MAGG)magphot.mag;em.opt.Bfloatnullablee_gmag[0.009/10]? Uncertainty on gmag (ERRMAGG)magstat.error;phot.magdoublenullablermag[12/25.8]? Magnitude in SDSS r-band (MAGR)magphot.mag;em.opt.Rfloatnullablee_rmag[0.0008/3]? Uncertainty on rmag (ERRMAGR)magstat.error;phot.magdoublenullableimag[11.9/24]? Magnitude in SDSS i-band (MAGI)magphot.mag;em.opt.Ifloatnullablee_imag[0.0007/3]? Uncertainty on imag (ERRMAGI)magstat.error;phot.magdoublenullablezmag[12/22.3]? Magnitude in SDSS z-band (MAGZ)magphot.mag;em.opt.Ifloatnullablee_zmag[0.0009/1]? Uncertainty on zmag (ERRMAGZ)magstat.error;phot.magdoublenullableSloanDisplay the online SDSS-DR17 data for the nearest object if gmag is givenmeta.ref.urlcharJmag[4.6/20.1]? J-band magnitude from the best NIR catalog (MAGJ)magphot.mag;em.IR.JfloatnullableClassSource classification according to Kashyap+ 2023, J/ApJS/269/10 Bayesian method ("member", "background" or "foreground") (CLASSIFICATION)meta.code.membercharG13Display data from Guarcello+ 2013, J/ApJ/773/135 within 3" if Disk indication is givenmeta.ref.urlchare_Jmag[0.005/10]? Uncertainty on Jmag (ERRMAGJ)magstat.error;phot.magfloatnullableHmag[3.5/20]? H-band magnitude from the best NIR catalog (MAGH)magphot.mag;em.IR.Hfloatnullablee_Hmag[0.004/10]? Uncertainty on Hmag (ERRMAGH)magstat.error;phot.magfloatnullableKmag[2.7/18]? K band magnitude from the best NIR catalog (MAGK)magphot.mag;em.IR.Kfloatnullablee_Kmag[0.004/10]? Uncertainty on Kmag (ERRMAGK)magstat.error;phot.magfloatnullable3.6mag[5/17]? Spitzer/IRAC 3.6um band magnitude (MAG1)magphot.mag;em.IR.3-4umfloatnullablee_3.6mag[0.002/2]? Uncertainty on 3.6mag (ERRMAG1)magstat.errorfloatnullable4.5mag[4.3/17]? Spitzer/IRAC 4.5um band magnitude (MAG2)magphot.mag;em.IR.4-8umfloatnullablee_4.5mag[0.002/3]? Uncertainty on 4.5mag (ERRMAG2)magstat.errorfloatnullable5.8mag[2/16.2]? Spitzer/IRAC 5.8um band magnitude (MAG3)magphot.flux.density;em.IR.4-8umfloatnullablee_5.8mag[0.001/7]? Uncertainty on 5.8mag (ERRMAG3)magstat.errorfloatnullable8.0mag[2.2/17.1]? Spitzer/IRAC 8um band magnitude (MAG4)magphot.flux.density;em.IR.8-15umfloatnullablee_8.0mag[0.001/8]? Uncertainty on 8.0mag (ERRMAG4)magstat.errorfloatnullable24mag[0.8/13]? Spitzer/MIPS 24um band magnitude (MAGMIPS)magphot.flux.density;em.IR.15-30umfloatnullablee_24mag[0.003/8.2]? Uncertainty on 24mag (ERRMAGMIPS)magstat.errorfloatnullableFXfull[7.5e-17/4e-12] Energy flux in erg/cm^2^/s in the X-ray full energy band (Wright+ 2023, J/ApJS/269/7 and Flaccomio+ 2023ApJS..269...12F) (FLUX_XRAY_FULL)mW.m**-2phot.flux;em.X-raydoubleProb[-6/-2] Probability associated with the null hypothesis for the X-ray source of being a background fluctuation, calculated using ACIS extract software (Wright+ 2023, J/ApJS/269/7) (PROB_NO_SOURCE)meta.id.assoc;stat.probabilityfloatJ/ApJS/269/9/tablea2Secondary table of the merged optical, infrared, and X-rays catalog of Cygnus OB2ID[1/5712] Identifier (ID)meta.idintprimarySharp[-8.5/31]? Sharp parameter from the OSIRIS images (Guarcello+ 2012, J/ApJS/202/19) (SHARP)stat.fit.paramfloatnullableG12Display data from Guarcello+ 2012, J/ApJS/202/19 within 3" if OSIRIS data is givenmeta.ref.urlcharRmagIP[12/23.3]? Magnitude in IPHAS R band, from DR2 if available otherwise DR1 (MAGR_IP)magphot.mag;em.opt.Rfloatnullablee_RmagIP[0.0008/0.6]? RmagIP uncertainty (ERRMAGR_IP)magstat.errordoublenullableImagIP[0.001/20.7]? Magnitude in IPHAS I band, from DR2 if available otherwise DR1 (MAGI_IP)magphot.mag;em.opt.Ifloatnullablee_ImagIP[0.001/0.3]? ImagIP uncertainty (ERRMAGI_IP)magstat.errordoublenullableHamagIP[11.8/22.3]? Magnitude in IPHAS Halpha band, from DR2 if available otherwise DR1 (MAGHA)magphot.mag;em.line.Halphafloatnullablee_HamagIP[0.001/0.8]? HamagIP uncertainty (ERRMAGHA)magstat.errorfloatnullableIPHASDisplay data from IPHAS DR2 (II/321) within 3" if Halpha mag is givenmeta.ref.urlcharumag[15.9/26.8]? Magnitude in SDSS/DR9 u band (MAGU)magphot.mag;em.opt.Ufloatnullablee_umag[0.01/13.1]? Uncertainty on umag (ERRMAGU)magstat.error;phot.magdoublenullablegmag[14.5/26.4]? Magnitude in SDSS/DR9 g band (MAGG)magphot.mag;em.opt.Bfloatnullablee_gmag[0.009/10]? Uncertainty on gmag (ERRMAGG)magstat.error;phot.magdoublenullablermag[13.9/23.3]? Magnitude in SDSS/DR9 r band (MAGR_SD)magphot.mag;em.opt.Rfloatnullablee_rmag[0.005/9]? Uncertainty on rmag (ERRMAGR_SD)magstat.error;phot.magdoublenullableimag[12.5/23]? Magnitude in SDSS/DR9 i band (MAGI_SD)magphot.mag;em.opt.Ifloatnullablee_imag[0.0007/4.1]? Uncertainty on imag (ERRMAGI_SD)magstat.error;phot.magdoublenullablezmag[12.2/20.8]? Magnitude in SDSS/DR9 z band (MAGZ_SD)magphot.mag;em.opt.Ifloatnullablee_zmag[0.008/2]? Uncertainty on zmag (ERRMAGZ_SD)magstat.error;phot.magdoublenullableSDSSCl[-999/6] Classification based on SDSS photometry (6=star, 1903 occurrences or 3=galaxy, 64 occurrences or 0=unknown, 10 occurrences) (SDSS_CLASS)meta.code.classintSDSSDisplay the SDSS DR9 (V/139) and DR16 (V/154) within 3" if rmag is givenmeta.ref.urlcharJmag[4.6/18.7]? Magnitude in 2MASS J band (MAGJ_2M)magphot.mag;em.IR.Jfloatnullablee_Jmag[0.018/10]? Uncertainty on Jmag (ERRMAGJ_2M)magstat.error;phot.magfloatnullableHmag[3.5/16.8]? 2MASS H-band magnitude (MAGH_2M)magphot.mag;em.IR.Hfloatnullablee_Hmag[0.01/10]? Uncertainty on Hmag (ERRMAGH_2M)magstat.error;phot.magfloatnullableKsmag[2.7/16.7]? 2MASS Ks-band magnitude (MAGK_2M)magphot.mag;em.IR.Kfloatnullablee_Ksmag[0.01/10]? Uncertainty on Ksmag (ERRMAGK_2M)magstat.error;phot.magfloatnullableQflg2MASS JHK photometric quality flag; see II/246 (PHQUAL)meta.code.qual;photcharRflgSource of JHK default mag; see II/246 (RDFLAG)meta.bibcharBflgJHK components fit to source; see II/246 (BLFLAG)meta.codecharCflg2MASS artifact contamination, confusion; see II/246 (CCFLAG)meta.codechar2MDisplay the 2MASS data (II/246) within 3" if Ksmag is givenmeta.ref.urlcharJmagUK[12/20.1]? Magnitude in UKIDSS J band (MAGJ_UK)magphot.mag;em.IR.Jfloatnullablee_JmagUK[0.005/0.2]? JmagUK uncertainty (ERRMAGJ_UK)magstat.errorfloatnullableHmagUK[11.8/19]? Magnitude in UKIDSS H band (MAGH_UK)magphot.mag;em.IR.Hfloatnullablee_HmagUK[0.004/0.2]? HmagUK uncertainty (ERRMAGH_UK)magstat.errorfloatnullableKmagUK[10.7/18]? Magnitude in UKIDSS K band (MAGK_UK)magphot.mag;em.IR.Kfloatnullablee_KmagUK[0.004/0.2]? KmagUK uncertainty (ERRMAGK_UK)magstat.errorfloatnullableJ-K[-0.13/6.4]? UKIDSS J-K color index (COLJK_UK)magphot.color;em.IR.J;em.IR.Kfloatnullablee_J-K[0.007/0.2]? J-K uncertainty (ERRCOLJK_UK)magstat.error;phot.color;em.IR.JfloatnullableH-K[-0.02/2.7]? UKIDSS H-K color index (COLHK_UK)magphot.color;em.IR.H;em.IR.Kfloatnullablee_H-K[0.007/0.2]? H-K uncertainty (ERRCOLHK_UK)magstat.error;phot.color;em.IR.HfloatnullableUKIDSSDisplay the UKIDSS/GPS DR6 data (II/316) within 3" if KmagUK is givenmeta.ref.urlcharSflg[0/1] Equal to 1 if the OIR and X-ray counterparts have been matched by the modified Smith+ 2011MNRAS.416..857S method (TAG_SM)meta.codeintBIflg[0/1] Equal to 1 if the OIR and X-ray counterparts have been matched by the Bayesian matching procedure defined by Naylor+ 2013, J/ApJS/209/30 applied using the MAGI values (TAG_NB_I)meta.codeintBKflg[0/1] Equal to 1 if the OIR and X-ray counterparts have been matched by the Bayesian matching procedure defined by Naylor+ 2013, J/ApJS/209/30 applied using the MAGK values (TAG_NB_K)meta.codeintB1flg[0/1] Equal to 1 if the OIR and X-ray counterparts have been matched by the Bayesian matching procedure defined by Naylor+ 2013, J/ApJS/209/30 applied using the MAG1 values (TAG_NB_IRAC)meta.codeintRel[0/1] Equal to 1 if the OIR-X-ray match is "reliable" (RELIABLE_MATCH)meta.codeintXID[0/1] Equal to 1 if the source is a multiple OIR vs. X-ray identification (MULTI_OIR_X>1) and this coincidence has been set as the most reliable by visual inspection of positions and OIR diagrams. Single matches always have SUGGESTED_COUNTERPART=1meta.codeint_RAPositions from Wright+ 2023, J/ApJS/269/7 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Wright+ 2023, J/ApJS/269/7 (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[WDG2023][1/7922] X-ray source ID in Wright+ 2023, J/ApJS/269/7 catalog (CXO_ID)meta.id;meta.mainintrmagOS[11.7/25.8]? Magnitude in OSIRIS r band (MAGR_OS)magphot.mag;em.opt.Rfloatnullablee_rmagOS[0.0008/1.3]? rmagOS uncertainty (ERRMAGR_OS)magstat.errordoublenullableimagOS[11.3/24]? Magnitude in OSIRIS i band (MAGI_OS)magphot.mag;em.opt.Ifloatnullablee_imagOS[0.0009/1]? imagOS uncertainty (ERRMAGI_OS)magstat.errordoublenullablezmagOS[10.7/22.3]? Magnitude in OSIRIS z band (MAGZ_OS)magphot.mag;em.opt.Ifloatnullablee_zmagOS[0.0009/1]? zmagOS uncertainty (ERRMAGZ_OS)magstat.errordoublenullableChi2[1/35]? Combined chi^2^ parameter describing the goodness of the PSF fit on OSIRIS images (Guarcello+ 2012, J/ApJS/202/19) (CHI)stat.fit.chi2;instr.det.psffloatnullableMultOpt[0/2] The number of multiple coincidences between the OSIRIS, IPHAS, or SDSS counterparts of this source (MULTI_OPT) (1)meta.numberintMultIR[0/2] The number of multiple coincidences between the UKIDSS and 2MASS counterparts of this source (MULTI_UK_2M) (1)meta.numberintMultIROpt[-1/2] The number of multiple coincidences between the optical and infrared counterparts of this source (MULTI_NIR_OPT) (1)meta.numberintMultOIR-IRAC[-1/3] The number of multiple coincidences between the optical+JHK and IRAC counterparts of this source (MULTI_OIR_IRAC) (1)meta.numberintMultOIR-X[-4/4] The number of multiple coincidences involving the OIR and X-ray counterparts of this source (MULTI_OIR_X) (1)meta.numberintSepOIR-X[0.005/6.1]? Distance between the OIR and the X-ray counterparts (DIST_OIR_X)arcsecpos.angDistancefloatnullableRelOIR-X[0/1] Reliability of the OIR vs. X-ray coincidence as defined with the modified Smith+ 2011MNRAS.416..857S method (REL_OIR_X)meta.codefloatPMflg[0/1] Equal to 1 if the OIR and X-ray counterparts have been matched by the PM matching method (TAG_PM)meta.codeint