J/ApJ/461/127ivo://CDS.VizieR/J/ApJ/461/127doi:10.26093/cds/vizier.14610127CDSMoran E.C.Helfand D.J.Becker R.H.White R.L.1999-06-19T22:48:52Z1999-06-19T22:43:55ZCDS support team

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

cds-question@unistra.frx-ray-sourcesThe X-ray sources from the observations with the Einstein Observatory (HEAO-2) with intensities of 2-sigma above the background are compiled in this catalog. This catalog covers more sky at fainter flux levels than the Einstein Medium Sensitivity Survey. Fields with diffuse emission sources were excluded. Thus data within 10 degrees of the galactic plane as well as fields within the boundaries of the Magellanic Clouds were excluded. The catalog covers 1850 sq. degrees of the sky. The generation of the Einstein Two-Sigma Catalog was described in detail by Moran et al. (1996). Read this article carefully to ensure responsible use of the Catalog. Address any questions to Ed Moran (edhed@igpp.llnl.gov). In particular it should be noted that only 28%, or about 13,000 sources in the 2-sigma catalog are real sources. The authors show that cross-correlations with other catalogs is an effective way to select sources in this catalog that are probably real.1996ApJ...461..127Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/461/127CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/15 : Einstein Medium Sensitivity Survey Cataloghttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/461/127https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/461/127http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/461/127https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/461/127https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/461/127http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/461/127GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/461/127/twosigma (The 2-sigma catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/461/127/twosigma?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/461/127/twosigma?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/461/127/twosigma?GETtext/xml+votable180.050000true0.6424315-42.12782550.005555555555555556Einsteinhttps://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/461/127?format=asciiX-raydefaultJ/ApJ/461/127/twosigmaThe 2-sigma catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA1950RA (1950) of the sourcepos.eq.ra;meta.mainindexedDE1950Dec (1950) of the sourcepos.eq.dec;meta.mainindexedS/NSignal-to-noise ratio of the sourcestat.snrfloatIPCSEQIPC Sequence number containing the sourcemeta.id;meta.mainintcnts125Number of background-subtracted counts collected within a 1.25 arcmin radius circular aperturearcmin**-2instr.backgroundfloatcnts20Number of background-subtracted counts collected within a 2.0 arcmin radius circular aperturearcmin**-2instr.backgroundfloatexp125flatfield-weighted exposure time for the source in the 1.25 arcmin radius aperturestime.duration;obs.exposurefloatexp20flatfield-weighted exposure time for the source in the 2.0 arcmin radius aperturestime.duration;obs.exposurefloatN125Number of "good" pixels used for count in the 1.25 arcmin radius aperturemeta.numberintN20Number of "good" pixels used for count in the 2.0 arcmin radius aperturemeta.numberintNbgNumber of "good" pixels used for the background count in the concentric 3-6 arcmin radius annulusmeta.numberint