J/ApJS/162/304ivo://CDS.VizieR/J/ApJS/162/304doi:10.26093/cds/vizier.21620304CDSHenry J.P.Mullis C.R.Voges W.Bohringer H.Briel U.G.Gioia I.M.,Huchra J.P.2007-06-17T11:31:21Z2007-06-17T11:28:57ZCDS support team

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

cds-question@unistra.frx-ray-sourcessurveysThe sky around the North Ecliptic Pole (NEP), at 18:00:00+66:33:39, has the deepest exposure of the entire ROSAT All-Sky Survey (RASS, Cat. <IX/10>). The NEP is an undistinguished region of moderate Galactic latitude, b=29.8{deg}, and hence suitable for compiling statistical samples of both Galactic and extragalactic objects. We have made such a compilation in the 80.6{deg}^2^ region surrounding the NEP. Our sample fully exploits the properties of the RASS, since the only criteria for inclusion are source position and significance, and it yields the deepest large solid angle contiguous sample of X-ray sources to date. We find 442 unique sources above a flux limit ~2x10^-14^ergs/cm^2^/s in the 0.5-2.0keV band. In this paper we present the X-ray properties of these sources as determined from the RASS. These include positions, fluxes, spectral information in the form of hardness ratios, and angular sizes. Since we have performed a comprehensive optical identification program we also present the average X-ray properties of classes of objects typical of the X-ray sky at these flux levels. We discuss the use of the RASS to find clusters of galaxies based on their X-ray properties alone.2006ApJS..162..304Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/162/304CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/149/29 : ROSAT NEP optical identifications (Gioia+, 2003)VIII/28 : Bell Laboratories H I Survey (Stark+ 1992)J/ApJ/617/192 : ROSAT AGN Catalog in North Ecliptic Pole (Mullis+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/162/304https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/162/304http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/162/304https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/162/304https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/162/304http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/162/304GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/162/304/table4 (ROSAT NEP X-ray source catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/162/304/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/162/304/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/162/304/table4?GETtext/xml+votable180.050000true258.85541762.6594440.0055555555555555564/1002 5/2557 2559 2900 2901 2903 2908 2909 2910 3837 3838 3839 4012 4013 4014 6/10205 10206 10207 10221 10223 10225 10226 10227 10232 10234 10235 11589 11591 11608 11610 11611 11644 11645 11646 11728 15326 15327 15343 15345 15347 16010 16011 16014 16060 16061 16098https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/162/304?format=asciiX-raydefaultJ/ApJS/162/304/table4ROSAT NEP X-ray source catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRXROSAT-NEP source name (JHHMM.m+DDMM)meta.id;meta.mainchar[GHM2003]The NEP source number (see J/ApJS/149/29)meta.ref;pos.frameintOptIDView data from Gioia et al. (Cat. <J/ApJS/149/29>)meta.ref.urlcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainCRateNet (0.1-2.4keV) count rate (1)ct/sphot.count;em.X-rayfloate_CRateThe 1{sigma} error in CRatect/sstat.errorfloatExpTimeEquivalent on-axis exposure timestime.duration;obs.exposureintNH? Hydrogen column density (2)1e+20cm**-2phys.columnDensityfloatnullableHR1Hardness ratio 1 (3)phot.flux;arith.ratiofloate_HR1The 1{sigma} error in HR1stat.errorfloatHR2Hardness ratio 2 (3)phot.flux;arith.ratiofloate_HR2The 1{sigma} error in HR2stat.errorfloatExtSigma of the source extent (4)arcsecphys.angSizeintExt-LDifference in likelihood (5)stat.likelihoodintExist? Existence likelihood from Maximum likelihood analysis (6)stat.likelihoodintnullableMapExistence likelihood from MDETECT analysis (7)stat.likelihoodintFlux? Total observed 0.5-2keV unabsorbed flux in units of 10^-14^erg/s/cm^2^1e-17W.m**-2phot.flux;em.X-rayfloatnullableLum? Total rest 0.5-2keV luminosity (8)1e+37Wphys.luminositydoublenullableClassOptical identification class (9)src.classcharz? Spectroscopic redshiftsrc.redshiftfloatnullableParam? Unabsorbed spectrum parameter, temperature in keV or photon index (10)stat.paramfloatnullableSC? Size correction (10)arith.factorfloatnullable