J/A+A/335/467ivo://CDS.VizieR/J/A+A/335/467doi:10.26093/cds/vizier.33350467CDSThomas H.-C.Beuermann K.Reinsch K.Schwope A.D.Truemper J.,Voges W.1998-12-03T15:36:39Z1998-12-03T16:35:37ZCDS support team

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

cds-question@unistra.frx-ray-sourcesastronomical-object-identificationWe present a summary of spectroscopic identifications for a complete sample of bright soft high galactic latitude X-ray sources drawn from the ROSAT All-Sky Survey which have PSPC count-rates CR>0.5cts/s and hardness ratios HR1<0. Of a total of 397 sources, 270 had catalogued counterparts although most of these were not previously known as X-ray sources; of the remaining 127 sources neither X-ray nor optical properties were previously known. Of the whole sample of very soft X-ray sources 155 were also discovered by the Wide-Field-Camera on board ROSAT. We present spectroscopic identifications of 108 sources and other identifications for further 18 sources; 1 source remains unidentified so far. In practically all cases a unique optical counterpart exists facilitating identification. The largest source classes are AGN, magnetic cataclysmic variables, and hot white dwarfs.1998A&A...335..467Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/335/467CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1996)J/MNRAS/274/1165 : The 2RE Source Catalogue (Pye+ 1995)J/MNRAS/274/1194 : Optical Identifications of ROSAT EUV Sources (Mason+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/335/467https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/335/467http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/335/467https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/335/467https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/335/467http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/335/467GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/335/467/table3 (Summary of the optical identification program for new sources in our sample.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/335/467/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/335/467/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/335/467/table3?GETtext/xml+votable180.050000true3.545833-50.3766670.005555555555555556https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/335/467?format=asciiX-raydefaultJ/A+A/335/467/table2Summary of the optical identification program for previously known sources in our sample.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1RXS1RXS designationmeta.id;meta.maincharn_1RXS[*] Note on the object (1)meta.notecharNameName of the optical counterpartmeta.id.assoccharSpTypeSpectral type of the counterpartsrc.spTypecharSepSeparation between optical and X-ray positionsarcsecpos.angDistancefloatSep(r90)Separation between optical and X-ray positions in units of the 90% confidence radiipos.angDistancefloatJ/A+A/335/467/notesIndividual notes1RXS1RXS designationmeta.id;meta.maincharNoteText of the notemeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/A+A/335/467/table3Summary of the optical identification program for new sources in our sample.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1RXS1RXS designationmeta.id;meta.maincharRA2000? Optical counterpart right ascension (2000)pos.eq.ra;meta.mainnullableDE2000? Optical counterpart declination (2000)pos.eq.dec;meta.mainnullableSep? Separation between optical and X-ray positions in arcsecarcsecpos.angDistancefloatnullableSep(r90)? Separation between optical and X-ray positions in units of the 90% confidence radiipos.angDistancefloatnullableCRRASS BSC PSPC count-ratect/sphot.count;em.X-rayfloate_CRrms uncertainty on CR0.01count.s**-1stat.errorintHR1Hardness ratio HR1phot.flux;arith.ratiofloate_HR1rms uncertainty on HR1stat.errorintClassClassification of the optical counterpartsrc.classcharTypeType of the optical counterpartsrc.classcharz? Redshift if extragalacticsrc.redshiftfloatnullableu_zUncertainty flag on zmeta.code.errorcharVmag? V magnitudemagphot.mag;em.opt.VfloatnullableNoteNotes (1)meta.notechar