J/ApJS/149/29ivo://CDS.VizieR/J/ApJS/149/29doi:10.26093/cds/vizier.21490029CDSGioia I.M.Henry J.P.Mullis C.R.Bohringer H.Briel U.G.Voges W.,Huchra J.P.2007-06-22T08:47:33Z2007-06-22T08:45:09ZCDS support team

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

cds-question@unistra.frsurveysradio-sourcesredshiftedastronomical-object-identificationThe X-ray data around the North Ecliptic Pole (NEP) of the ROSAT All Sky Survey have been used to construct a contiguous area survey consisting of a sample of 445 individual X-ray sources above a flux of ~2x10^-14^erg/cm^2^/s in the 0.5-2.0keV energy band. The NEP survey is centered at RA=18:00 (2000) DE=+66:33 and covers a region of 80.7deg^2^ at a moderate Galactic latitude of b=29.8{deg}. Hence, the NEP survey is as deep and covers a comparable solid angle to the ROSAT serendipitous surveys but is also contiguous. We have identified 99.6% of the sources and determined redshifts for the extragalactic objects. In this paper we present the optical identifications of the NEP catalog of X-ray sources including basic X-ray data and properties of the sources. We also describe with some detail the optical identification procedure. The classification of the optical counterparts to the NEP sources is very similar to that of previous surveys, in particular the Einstein Extended Medium Sensitivity Survey (EMSS). The main constituents of the catalog are active galactic nuclei (AGNs) (~49%), either type 1 or type 2 according to the broadness of their permitted emission lines. Stellar counterparts are the second most common identification class (~34%). Clusters and groups of galaxies comprise 14%, and BL Lacertae objects 2%. One non-AGN galaxy and one planetary nebula have also been found. The NEP catalog of X-ray sources is a homogeneous sample of astronomical objects featuring complete optical identification.2003ApJS..149...29Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/149/29CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)J/A+AS/141/257 : Very deep IRAS 60um sources in NEP region (Aussel+, 2000)J/A+AS/134/221 : Radio-loud ROSAT sources near NEP (Brinkmann+, 1999)J/ApJS/93/145 : Radio survey around North Ecliptic Pole (Kollgaard+, 1994)J/A+AS/75/67 : Survey around the North Ecliptic Pole at 11cm (Loiseau+, 1988)J/ApJS/162/304 : ROSAT NEP X-ray source catalog (Henry+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/149/29https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/149/29http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/149/29https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/149/29https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/149/29http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/149/29GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/149/29/table3 (ROSAT NEP Source Catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/149/29/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/149/29/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/149/29/table3?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/149/29?format=asciiOpticalRadiodefaultJ/ApJS/149/29/table3ROSAT NEP Source CatalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRXObject name (JHHMM.m+DDMM)meta.id;meta.maincharprimaryn_RX[n] note detailed in notes.dat filemeta.notecharXIDDisplay data from Henry et al. (Cat. <J/ApJS/162/304)meta.ref.urlcharNEPNorth Ecliptic Pole scan numberobs.fieldintRAJ2000Hour of ROSAT Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of ROSAT Declination (J2000)pos.eq.dec;meta.mainRAO? Hour of associated optical object Right Ascension (J2000)pos.eq.ranullableDEO? Degree of associated optical object Declination (J2000)meta.id.assoc;pos.eq.decnullableS/NSignal to noise (1)stat.snrfloatFXdetRest frame detected 0.5-2keV unabsorbed flux in units of 10^-14^erg/cm^2^/s (2)1e-17W.m**-2phot.flux;em.X-rayfloatFXtotRest frame total 0.5-2 keV unabsorbed flux in units of 10^-14^erg/cm^2^/s (3)1e-17W.m**-2phot.flux;em.X-rayfloatLX? Rest frame K-corrected 0.5-2keV luminosity in units of 10^44^erg/s (4)1e+37Wphys.luminosity;em.X-rayfloatnullablez? Spectroscopically measured redshift (5)src.redshiftfloatnullableIDOptical identification of X-ray source (6)meta.id.assoccharNotesAdditional notes (7)meta.notecharJ/ApJS/149/29/notesIndividual notesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRXObject name (JHHMM.m+DDMM)meta.id;meta.maincharNoteText of the notemeta.notechar