J/ApJS/209/30ivo://CDS.VizieR/J/ApJS/209/30doi:10.26093/cds/vizier.22090030CDSNaylor T.Broos P.S.Feigelson E.D.2018-05-30T10:55:07Z2014-01-22T13:46:23ZCDS support team

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

cds-question@unistra.frx-ray-sourcesinfrared-sourcesastronomical-object-identificationIdentifying the infrared counterparts of X-ray sources in Galactic plane fields such as those of the MYStIX project presents particular difficulties due to the high density of infrared sources. This high stellar density makes it inevitable that a large fraction of X-ray positions will have a faint field star close to them, which standard matching techniques may incorrectly take to be the counterpart. Instead we use the infrared data to create a model of both the field star and counterpart magnitude distributions, which we then combine with a Bayesian technique to yield a probability that any star is the counterpart of an X-ray source. In our more crowded fields, between 10% and 20% of counterparts that would be identified on the grounds of being the closest star to an X-ray position within a 99% confidence error circle are instead identified by the Bayesian technique as field stars. These stars are preferentially concentrated at faint magnitudes. Equally importantly the technique also gives a probability that the true counterpart to the X-ray source falls beneath the magnitude limit of the infrared catalog. In deriving our method, we place it in the context of other procedures for matching astronomical catalogs.2013ApJS..209...30Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/209/30CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJS/209/32 : MYStIX probable young stars (MPCM) (Broos+, 2013)J/ApJS/209/31 : The MYStIX IR-Excess Source catalog (MIRES) (Povich+, 2013)J/ApJS/209/29 : MYStIX: MIR observations and catalogs (Kuhn+, 2013)J/ApJS/209/28 : MYStIX Wide-Field NIR data: crowded fields (King+, 2013)J/ApJS/209/27 : MYStIX: the Chandra X-ray sources (Kuhn+, 2013)J/A+A/539/A119 : Pismis 24 stars with X-ray emission (Fang+, 2012)J/ApJ/753/117 : X-ray catalog of Eagle Nebula (Guarcello+, 2012)J/ApJ/747/51 : Lagoon Nebula stars. I. Rotation periods (Henderson+, 2012)J/ApJS/194/14 : A Pan-Carina YSO catalog (Povich+, 2011)J/ApJS/194/12 : Trumpler 16 in the CCCP (Wolk+, 2011)J/ApJS/194/11 : Chandra study of Trumpler 15 in Carina (Wang+, 2011)J/ApJS/194/9 : X-ray star clusters in the Carina complex (Feigelson+, 2011)J/ApJS/194/6 : Candidate X-ray emitting OB stars in Carina (Povich+, 2011)J/ApJS/194/2 : Chandra Carina Complex Project (CCCP) catalog (Broos+, 2011)J/ApJ/743/166 : X-ray and infra-red study of RCW 38 (Winston+, 2011)J/ApJ/743/39 : Spitzer obs. of W3 molecular cloud (Rivera-Ingraham+, 2011)J/ApJ/733/113 : IRAC observations of IC 1795 (Roccatagliata+, 2011)J/ApJ/733/50 : MIR phot. monitoring of the ONC (Morales-Calderon+, 2011)J/A+A/527/A77 : NGC 1893 optical and NIR photometry (Prisinzano+, 2011)J/A+A/521/A61 : Stars associated to Eagle Nebula (NGC6611) (Guarcello+ 2010)J/ApJ/725/2485 : X-rays from the star-forming complex W40 (Kuhn+, 2010)J/ApJ/720/679 : Optical spectroscopy in Cygnus X region (Beerer+, 2010)J/ApJ/716/474 : The Rosette star-forming complex. III. (Wang+, 2010)J/MNRAS/407/1170 : IRAC photometry of M8 (Kumar+, 2010)J/ApJ/707/1 : Water and Methanol masers in NGC 6334I(N) (Brogan+, 2009)J/ApJ/698/1 : Spitzer observations of NGC 2362 (Currie+, 2009)J/ApJ/696/1278 : The extended star-forming environment of M17 (Povich+, 2009)J/ApJ/696/47 : Rosette star-forming complex with Chandra. II. (Wang+, 2009)J/AJ/138/1116 : A Spitzer view of NGC 2264 (Sung+, 2009)J/A+A/496/453 : Photometry of candidate members of NGC6611 (Guarcello+, 2009)J/AJ/138/227 : Stellar clusters in NGC 6334 complex (Feigelson+, 2009)J/ApJ/675/464 : Chandra observations of NGC 2244 (Wang+, 2008)J/A+A/488/211 : Infrated photometry of NGC 1893 (Caramazza+, 2008)J/ApJS/169/353 : Chandra sources in M17 (Broos+, 2007)J/ApJS/168/100 : X-ray study of star-forming region NGC 6357 (Wang+, 2007)J/AJ/134/999 : X-ray observations of NGC 2264 (Dahm+, 2007)J/AJ/133/2072 : Spitzer observations of NGC 2362 (Dahm+, 2007)J/ApJ/660/1532 : Spitzer/IRAC-MIPS survey of NGC 2244 (Balog+, 2007)J/ApJ/654/347 : Chandra X-ray observations in Eagle Nebula. I. (Linsky+, 2007)J/ApJ/654/338 : Spitzer photometry in W3 molecular cloud (Ruch+, 2007)J/A+A/462/245 : BVI photometry in NGC 6611 (Guarcello+, 2007)J/ApJ/643/965 : Spitzer photometry of the Trifid nebula (M20) (Rho+, 2006)J/ApJ/642/972 : IR phot. of a star-forming core in NGC 2264 (Young+, 2006)J/ApJ/646/269 : Multiwavelength analysis of NGC 2362 (Delgado+, 2006)J/A+A/460/133 : Chandra X-ray sources in NGC 2362 (Damiani+, 2006)J/A+A/455/903 : ACIS-I observations of NGC 2264 (Flaccomio+, 2006)J/AJ/132/1100 : X-ray and IR sources in RCW 38 (Wolk+, 2006)J/MNRAS/367/513 : JHKs[3.5][4.5] photometry of NGC 3372 (Tapia+, 2006)J/ApJS/160/319 : COUP: observations and source lists (Getman+, 2005)J/ApJ/608/781 : NGC 6530 Chandra X-ray catalog (Damiani+, 2004)J/ApJ/607/904 : Chandra obs. of Trifid nebula (Rho+, 2004)J/AJ/128/1684 : NGC 2264: VRIH{alpha} photometry (Sung+, 2004)J/AJ/127/2659 : CHANDRA observations of NGC 2264 (Ramirez+, 2004)J/ApJ/598/375 : Chandra X-ray observations of NGC 2024 (Skinner+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/209/30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/209/30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/209/30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/209/30https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/209/30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/209/30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/209/30/table2 (MYStIX datasets from 2013ApJS..209...26F; table added by CDS from 2013, ApJS, 209, 26)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/209/30/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/209/30/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/209/30/table2?GETtext/xml+votable180.050000true83.8220833-5.39111110.005555555555555556Cone search capability for table J/ApJS/209/30/xmatches (cross-matches of X-ray sources with near-IR (table2a) and mid-IR (table2b))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/209/30/xmatches?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/209/30/xmatches?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/209/30/xmatches?GETtext/xml+votable180.050000true309.513416742.33572220.0055555555555555565/10614 10615 6/1285 1287 1296 1298 3307 3649 14682 14704 21439 22243 22249 22854 22855 23637 23639 28890 28891 28913 28915 29116 29118 29461 29463 29504 29506 30341 37872 37884 37886 37923 37926 38016 39907https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/209/30?format=asciiX-rayInfrareddefaultJ/ApJS/209/30/table2MYStIX datasets from 2013ApJS..209...26F; table added by CDS from 2013, ApJS, 209, 26SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegRegion namemeta.id;obs.fieldcharf_Reg[a-c] Specific data origin(s) (1)meta.codecharNp[1/5]? Chandra number of pointingsmeta.numberintnullableExpChandra exposure time(s)kstime.duration;obs.exposurecharf_Exp[c] Specific exposures (1)meta.codecharRefXChandra principal published studies reference(s) (see refs.dat file)meta.bibcharf_RefX[a] Remarks for Orion field (1)meta.codecharNIRNear-IR surveys designation (2)meta.id;meta.datasetcharf_NIR[a-c] Specific near-IR data origin(s) (1)meta.codecharMIRMIR Spitzer Space Telescope surveys (3)meta.id;meta.datasetcharf_MIR[a] Specific mid-IR data origin(s) (1)meta.codecharRefsMid-IR reference(s) (see refs.dat file)meta.bibchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJS/209/30/refsReferences of table2.datrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference code numbermeta.id;meta.mainintBibCodeBibcodemeta.bib.bibcodecharAutAuthor's name(s)meta.bib.authorcharCommVizieR catalog referencemeta.id;meta.datasetcharJ/ApJS/209/30/xmatchescross-matches of X-ray sources with near-IR (table2a) and mid-IR (table2b)p.n1[0/1]? Probability for the first matchstat.fit.goodnessfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCXOX-ray source name (HHMMSS.ss+DDMMSS.s; J2000)meta.id;meta.maincharXCross-match within 1" with the MYStIX X-ray sources catalog (J/ApJS/209/27)meta.ref.urlintnullablep.n0[0/1]? Probability that no counterpart exists in the near-IR catalogstat.fit.goodnessfloatnullabler.n1Distance between the X-ray source and the near-IR sourcearcsecpos;arith.difffloatnullableRAn1deg? Right ascension (J2000) for first matchdegpos.eq.ranullableDEn1deg? Declination (J2000) for first matchdegpos.eq.decnullablep.n2[0/1]? Probability for the second matchstat.fit.goodnessfloatnullabler.n2Distance between the X-ray source and the near-IR sourcearcsecpos;arith.difffloatnullableRAn2deg? Right ascension (J2000) for second matchdegpos.eq.ranullableDEn2deg? Declination (J2000) for second matchdegpos.eq.decnullablep.n3[0/1]? Probability for the third matchstat.fit.goodnessfloatnullabler.n3Distance between the X-ray source and the near-IR sourcearcsecpos;arith.difffloatnullableRAn3deg? Right ascension (J2000) for third matchdegpos.eq.ranullableDEn3deg? Declination (J2000) for third matchdegpos.eq.decnullablep.n4[0/1]? Probability for the fourth matchstat.fit.goodnessfloatnullabler.n4Distance between the X-ray source and the near-IR sourcearcsecpos;arith.difffloatnullableRAn4deg? Right ascension (J2000) for fourth matchdegpos.eq.ranullableDEn4deg? Declination (J2000) for fourth matchdegpos.eq.decnullablep.m0[0/1]? Probability that no counterpart exists in the mid-IR catalogstat.fit.goodnessfloatnullablep.m1[0/1]? Probability for the first matchstat.fit.goodnessfloatnullabler.m1Distance between the X-ray source and the near-IR sourcearcsecpos;arith.difffloatnullableRAm1deg? Right ascension (J2000) for first matchdegpos.eq.ranullableDEm1deg? Declination (J2000) for first matchdegpos.eq.decnullablep.m2[0/1]? Probability for the second matchstat.fit.goodnessfloatnullabler.m2Distance between the X-ray source and the near-IR sourcearcsecpos;arith.difffloatnullableRAm2deg? Right ascension (J2000) for second matchdegpos.eq.ranullableDEm2deg? Declination (J2000) for second matchdegpos.eq.decnullablep.m3[0/1]? Probability for the third matchstat.fit.goodnessfloatnullabler.m3Distance between the X-ray source and the near-IR sourcearcsecpos;arith.difffloatnullableRAm3deg? Right ascension (J2000) for third matchdegpos.eq.ranullableDEm3deg? Declination (J2000) for third matchdegpos.eq.decnullable_RAPositions from CXO names (right ascension part)degpos.eq.ra;meta.mainindexed_DEPositions from CXO names (declination part)degpos.eq.dec;meta.mainindexed