J/MNRAS/342/802ivo://CDS.VizieR/J/MNRAS/342/802doi:10.26093/cds/vizier.73420802CDSMcHardy I.M.Gunn K.F.Newsam A.M.Mason K.O.Page M.J.Takata T.,Sekiguchi K.Sasseen T.Cordova F.Jones L.R.Loaring N.2024-06-28T20:17:24Z2006-03-10T22:19:30ZCDS support team

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

cds-question@unistra.frWe present the results of a Chandra ACIS-I survey of a high-latitude region at 13h +38{deg} which was earlier observed with ROSAT and which has recently been observed by XMM-Newton for 200ks. XMM-Newton will provide good-quality X-ray spectra for over 200 sources with fluxes around the knee of the logN/logS, which are responsible for the bulk of the X-ray background. The main aim of the Chandra observations is to provide arcsecond, or better, positions, and hence reliable identifications, for the XMM-Newton sources. The ACIS-I observations were arranged in a mosaic of four 30-ks pointings, covering almost all of the 15-arcmin radius XMM-Newton/ROSAT field. We detect 214 Chandra sources above a Cash likelihood statistic of 25, which approximates to 5{sigma} significance, to a limiting flux of ~1.3x10^-15^erg/cm^2^/s (0.5-7keV). Optical counterparts are derived from a Subaru SuprimeCam image reaching to R~27. The very large majority of the Chandra sources have an optical counterpart, with the distribution peaking at 23<R<24, although 14 have no counterpart to R=27. The fraction of X-ray sources with no identification brighter than R=27 is similar to that found in deeper Chandra surveys.2003MNRAS.342..802Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/342/802CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/37 : XMM-Newton Serendipitous Source Catalogue (1XMM) (XMM-SSC, 2003)IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)IX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)B/chandra : The Chandra Archive Log (CXC, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/342/802https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/342/802http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/342/802https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/342/802https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/342/802http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/342/802GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/342/802/table2 (Flux-ordered catalogue of Chandra sources and their optical counterparts.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/342/802/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/342/802/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/342/802/table2?GETtext/xml+votable180.050000true203.714291737.77197220.005555555555555556Cone search capability for table J/MNRAS/342/802/table5 (Catalogue of ROSAT sources detected by Chandra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/342/802/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/342/802/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/342/802/table5?GETtext/xml+votable180.050000true203.714291737.77197220.005555555555555556Cone search capability for table J/MNRAS/342/802/tablea1 (Chandra sources with alternative optical counterparts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/342/802/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/342/802/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/342/802/tablea1?GETtext/xml+votable180.050000true203.383708337.97107220.0055555555555555566/10484https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/342/802?format=asciiOpticaldefaultJ/MNRAS/342/802/table2Flux-ordered catalogue of Chandra sources and their optical counterparts.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_[MGN2003]Simbad column added by the CDSchar[MGN2003]Sequential number of Chandra sourceintprimaryn_[MGN2003][*+o] Notes (1)charAlt[UP] Flag for alternative optical candidate (G1)charFlux0.5-7.0keV fluxaW.m**-2floatchi2Cash {xi}^2^ value for the Chandra sourcefloatRAJ2000Chandra right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Chandra declination (J2000)pos.eq.dec;meta.mainDRA(O-X)? Optical-Chandra offset in right ascensionarcsecfloatnullableDDE(O-X)? Optical-Chandra offset in declinationarcsecfloatnullableD(O-X)? Total optical-Chandra offsetarcsecfloatnullablel_Rmag[<= >] Limit flag on RmagcharRmagR magnitude of the optical counterpartmagfloatOffCChandra off-axis angle of the sourcearcminfloatOffXXMM off-axis angle of the sourcearcminfloatFWHM? Fulll Width at Half MaximumarcsecfloatnullableS/G[0/1]? Stellarity of the optical counterpart 0 for galaxy, 1 for starfloatnullableJ/MNRAS/342/802/table5Catalogue of ROSAT sources detected by ChandraROSROSAT sequential numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRARROSAT right ascension (J2000)DERROSAT declination (J2000)[MGN2003]Sequential number of Chandra sourceintRAJ2000Chandra right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Chandra declination (J2000)pos.eq.dec;meta.mainD(R-C)Total ROSAT-Chandra offsetarcsecfloatD(O-C)? Total Optical-Chandra offsetarcsecfloatnullableOffCChandra off-axis angle of the sourcearcminfloatOffXXMM/ROSAT off-axis angle of the sourcearcminfloatClassClassification (1)charz? RedshiftfloatnullableRflagConfidence parameter from McHardy et al, 1998MNRAS.295..641McharConf[YN?] Confirmed source (2)charJ/MNRAS/342/802/tablea1Chandra sources with alternative optical counterpartsFWHM? Fulll Width at Half MaximumarcsecfloatnullableS/G[0/1]? Stellarity of the optical counterpart 0 for galaxy, 1 for starfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[MGN2003]Sequential number of Chandra sourceintAlt[UP] Note on identification (G1)charFlux0.5-7.0keV flux1e-18W.m**-2floatchi2Cash {xi}^2^ value for the Chandra sourcefloatRAJ2000Chandra right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Chandra declination (J2000)pos.eq.dec;meta.mainDRA(O-X)? Optical-Chandra offset in right ascensionarcsecfloatnullableDDE(O-X)? Optical-Chandra offset in declinationarcsecfloatnullableD(O-X)? Total optical-Chandra offsetarcsecfloatnullableRmagR magnitude of the optical counterpartmagfloatOffCChandra off-axis angle of the sourcearcminfloatOffXXMM off-axis angle of the sourcearcminfloatJ/MNRAS/342/802/notesNotes on sources with more than one possible counterpart (listed in tablea1.dat)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[MGN2003]Sequential number of Chandra sourceintAlt[UP] Note on identification (G1)charNoteText of the notechar