J/A+A/454/1047ivo://CDS.VizieR/J/A+A/454/1047doi:10.26093/cds/vizier.34541047CDSSana H.Gosset E.Rauw G.Sung H.Vreux J.-M.2007-01-03T06:18:20Z2007-01-03T07:17:12ZCDS support team

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

cds-question@unistra.fropen-star-clustersastronomical-object-identificationinfrared-photometryvisible-astronomyWide-band photometryob-starspre-main-sequence-starsx-ray-sourcesWe present the results of an X-ray campaign towards the young open cluster NGC 6231. The XMM-Newton observations, of a total duration of about 180 ks, reveals that NGC 6231 is very rich in the X-ray domain too. Indeed, 610 X-ray sources are detected in the present field of view, centered on the cluster core. The limiting sensitivity of our survey is approximately 610^-15^erg/s/cm^2^ but clearly depends on the location in the field of view and on the source spectrum. Using different existing catalogues, over 85% of the X-ray sources could be associated with at least one optical and/or infrared counterpart within a limited cross-correlation radius of 2.5 or 3-arcsec according to the optical/IR catalogue used. The surface density distribution of the X-ray sources presents a slight N-S elongation. Once corrected for the spatial sensitivity variation of the EPIC instruments, the radial profile of the source surface density is well described by a King profile with a central density of about 8 sources per arcmin^2^ and a core radius close to 3.1-arcmin. The distribution of the X-ray sources seems closely related to the optical source distribution. The expected number of foreground and background sources should represent about 9% of the detected sources, thus strongly suggesting that most of the observed X-ray emitters are physically belonging to NGC 6231. Finally, beside a few bright but soft objects -- corresponding to the early-type stars of the cluster -- most of the sources are relatively faint (~5x10^-15^erg/s/cm^2^) with an energy distribution peaked around 1.0-2.0keV.2006A&A...454.1047Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/454/1047CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/271 : The Guide Star Catalog, Version 2.2 (GSC2.2) (STScI, 2001)I/284 : The USNO-B1.0 Catalog (Monet+ 2003)J/A+AS/137/233 : UBVI imaging photometry of NGC 6231 (Baume+, 1999)J/AJ/115/734 : NGC 6231 UBVRI and H{alpha} photometry (Sung+ 1998)J/A+A/325/167 : Geneva photometry in NGC 6231 (Raboud+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/454/1047https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/454/1047http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/454/1047https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/454/1047https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/454/1047http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/454/1047GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/454/1047/table3 (X-ray source catalogue in NGC 6231)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/454/1047/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/454/1047/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/454/1047/table3?GETtext/xml+votable180.050000true253.2503333-41.91241670.0055555555555555566/42383 423948.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/454/1047?format=asciiX-rayOpticalInfrareddefaultJ/A+A/454/1047/table3X-ray source catalogue in NGC 6231recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqInternal X-ray source numbering schememeta.idintprimaryXMMUJRecommended XMM source denomination (G1)meta.id;meta.mainchare_PosError on the source positionarcsecstat.errorfloatL2(pn)? PN: Equivalent likelihood L2stat.likelihooddoublenullableCR(pn)? PN: count-rate in [0.5-10.0 keV]ct/ksphot.count;em.X-rayfloatnullablee_CR(pn)? PN: error on CR [0.5-10.0 keV]ct/ksstat.errorfloatnullableCRs(pn)? PN: count-rate in [0.5-1.0 keV]ct/ksphot.count;em.X-rayfloatnullablee_CRs(pn)? PN: error on CR_s [0.5-1.0 keV]ct/ksstat.errorfloatnullableCRm(pn)? PN: count-rate in [1.0-2.5 keV]ct/ksphot.count;em.X-rayfloatnullablee_CRm(pn)? PN: error on CR_m [1.0-2.5 keV]ct/ksstat.errorfloatnullableCRh(pn)? PN: count-rate in [2.5-10.0 keV]ct/ksphot.count;em.X-rayfloatnullablee_CRh(pn)? PN: error on CR_m [2.5-10.0 keV]ct/ksstat.errorfloatnullableHR1(pn)? PN: softer hardness ratio (2)phot.flux;arith.ratiofloatnullablee_HR1(pn)? PN: error on HR1stat.errorfloatnullableHR2(pn)? PN: harder hardness ratio (3)phot.flux;arith.ratiofloatnullablee_HR2(pn)? PN: error on HR2stat.errorfloatnullableL2(m1)? M1: Equivalent likelihood L2stat.likelihooddoublenullableCR(m1)? M1: count-rate in [0.5-10.0 keV]ct/ksphot.count;em.X-rayfloatnullablee_CR(m1)? M1: error on CR [0.5-10.0 keV]ct/ksstat.errorfloatnullableCRs(m1)? M1: count-rate in [0.5-1.0 keV]ct/ksphot.count;em.X-rayfloatnullablee_CRs(m1)? M1: error on CRs [0.5-1.0 keV]ct/ksstat.errorfloatnullableCRm(m1)? M1: count-rate in [1.0-2.5 keV]ct/ksphot.count;em.X-rayfloatnullablee_CRm(m1)? M1: error on CRm [1.0-2.5 keV]ct/ksstat.errorfloatnullableCRh(m1)? M1: count-rate in [2.5-10.0 keV]ct/ksphot.count;em.X-rayfloatnullablee_CRh(m1)? M1: error on CRm [2.5-10.0 keV]ct/ksstat.errorfloatnullableHR1(m1)? M1: softer hardness ratio (2)phot.flux;arith.ratiofloatnullablee_HR1(m1)? M1: error on HR1stat.errorfloatnullableHR2(m1)? M1: harder hardness ratio (3)phot.flux;arith.ratiofloatnullablee_HR2(m1)? M1: error on HR2stat.errorfloatnullableL2(m2)? M2: equivalent likelihood L2stat.likelihooddoublenullableCR(m2)? M2: count-rate in [0.5-10.0keV]ct/ksphot.count;em.X-rayfloatnullablee_CR(m2)? M2: error on CR [0.5-10.0keV]ct/ksstat.errorfloatnullableCRs(m2)? M2: count-rate in [0.5-1.0keV]ct/ksphot.count;em.X-rayfloatnullablee_CRs(m2)? M2: error on CRs [0.5-1.0keV]ct/ksstat.errorfloatnullableCRm(m2)? M2: count-rate in [1.0-2.5keV]ct/ksphot.count;em.X-rayfloatnullablee_CRm(m2)? M2: error on CRm [1.0-2.5keV]ct/ksstat.errorfloatnullableCRh(m2)? M2: count-rate in [2.5-10.0keV]ct/ksphot.count;em.X-rayfloatnullablee_CRh(m2)? M2: error on CRm [2.5-10.0keV]ct/ksstat.errorfloatnullableHR1(m2)? M2: softer hardness ratio (2)phot.flux;arith.ratiofloatnullablee_HR1(m2)? M2: error on HR1stat.errorfloatnullableHR2(m2)? M2: harder hardness ratio (3)phot.flux;arith.ratiofloatnullablee_HR2(m2)? M2: error on HR2stat.errorfloatnullableL2(epic)Epic: total equivalent likelihood L2stat.likelihooddoubleInstrUsed combination of instrumentsmeta.codecharExtExtended source flagmeta.codecharComComments and warningsmeta.notecharRAJ2000X-ray source right ascension (J2000) (4)pos.eq.ra;meta.mainDEJ2000X-ray source declination (J2000) (4)pos.eq.dec;meta.mainJ/A+A/454/1047/table6Cross-identification of the X-ray catalogue with different optical/IR cataloguesBraes? CI: Braes numbermeta.idintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqInternal X-ray source numbering schememeta.idintXMMUJRecommended XMM source denomination (G1)meta.id;meta.maincharDX2? 2MASS: correlation distancearcsecpos.angDistancefloatnullable2MASS2MASS (<II/246>) source namemeta.idcharJmag? 2MASS: J magnitudemagphot.mag;em.IR.JfloatnullableHmag? 2MASS: H magnitudemagphot.mag;em.IR.HfloatnullableKmag? 2MASS: K magnitudemagphot.mag;em.IR.KfloatnullableDXG? GSC2.2: correlation distancearcsecpos.angDistancefloatnullableGSC2.2GSC2.2 (<I/271>) source namemeta.idcharRmag? GSC2.2: R magnitudemagphot.mag;em.opt.RfloatnullableBmag? GSC2.2: B magnitudemagphot.mag;em.opt.BfloatnullableVmag? GSC2.2: V magnitudemagphot.mag;em.opt.VfloatnullableDXU? USNO B1.0: correlation distancearcsecpos.angDistancefloatnullableUSNOB1.0USNO B1.0 (<I/284>) source namemeta.idcharR1mag? USNO B1.0: R1 magnitudemagphot.mag;em.opt.RfloatnullableB1mag? USNO B1.0: B1 magnitudemagphot.mag;em.opt.BfloatnullableR2mag? USNO B1.0: R2 magnitudemagphot.mag;em.opt.RfloatnullableB2mag? USNO B1.0: B2 magnitudemagphot.mag;em.opt.BfloatnullableImag? USNO B1.0: I magnitudemagphot.mag;em.opt.IfloatnullableDXS? SSB06: correlation distancearcsecpos.angDistancefloatnullablef_SSB06[*] SSB06: flag (2)meta.codecharSSB06SSB06 (Sung et al., 2006, in prep.) source namemeta.idcharVmag2? SSB06: V magnitudemagphot.mag;em.opt.VfloatnullableV-I? SSB06: V-I colourmagphot.color;em.opt.V;em.opt.IfloatnullableB-V? SSB06: B-V colourmagphot.color;em.opt.B;em.opt.VfloatnullableU-B? SSB06: U-B colourmagphot.color;em.opt.U;em.opt.BfloatnullableHD/HDE? CI: HD/HDE numbermeta.idintnullableCD? CI: CD number (in format CD-41 NNNNN)meta.idintnullablen_CD[p] Multiplicity index on CDmeta.notecharCPD? CI: CPD number (in format CPD-41 NNNN)meta.idintnullableSegg? CI: Seggewiss (1968VeBon..79....1S) number NGC 6231 NNN in Simbadmeta.idintnullableSBL98? CI: Sung et al., 1998, Cat. <J/AJ/115/734> number, Cl* NGC 6231 SBL NNN in Simbadmeta.idintnullable