J/A+A/319/33ivo://CDS.VizieR/J/A+A/319/33doi:10.26093/cds/vizier.33190033CDSArp H.1997-12-09T16:53:11Z1997-12-09T17:53:05ZCDS support team

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

cds-question@unistra.frseyfert-galaxiesx-ray-sourcesExcess numbers of X-ray sources around bright Seyfert galaxies have been demonstrated with significances of association up to 7.4-sigma (Radecke, 1997A&A...319...18R). The optical identification of these sources is shown here to be predominantly blue stellar objects (BSO's) of which some are already catalogued as quasars. Excluding the two brightest Seyferts, a subset of 24 with apparent magnitudes between 8.04<=B_T_^o,i^<=12.90mag. show a minimum excess of >46 bright X-ray sources. These excess X-ray sources are generally distributed between 10'<r<40' and 12 of the Seyferts show conspicuous pairs of X-ray sources across their active nuclei. Additional pairing and alignment of sources is seen for the remaining Seyferts. Among the paired X-ray sources, 53 have been identified as BSO's. Some double and multiple BSO's have been identified which are candidates for groups and associations of quasars. Some groups are well aligned and some centered on small blue galaxies. Four previously known BL Lac objects fall close enough to the Seyferts in this sample to confirm, at a significance level of 1-2x10^-9^, a previously reported association of BL Lac objects with bright, low redshift galaxies.1997A&A...319...33Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/319/33CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/319/33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/319/33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/319/33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/319/33https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/319/33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/319/33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/319/33/table3 (Position of optically identified X-ray Sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/319/33/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/319/33/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/319/33/table3?GETtext/xml+votable180.050000true183.7954177.5344440.005555555555555556https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/319/33?format=asciiX-raydefaultJ/A+A/319/33/table3Position of optically identified X-ray SourcesRemRemarksmeta.notecharl_O-ELimit flag on O-Emeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalGalaxy namemeta.id;meta.maincharCCounts of the source in the .5-20keV band (1)ct/ksphot.count;em.X-rayfloatm_C[NS] Multiplicity index no Cmeta.code.multipcharRA2000Right ascension (2000)pos.eq.ra;meta.mainu_RAsUncertainty flag on right ascensionmeta.code.errorcharDE2000Declination signpos.eq.dec;meta.mainnullableu_DEsUncertainty flag on declinationmeta.code.errorcharn_Emag[B] B when Emag is Bmagmeta.notecharl_Emag[~] Limit flag on Emagmeta.code.errorcharEmag? E magnitude or B magnitude if n_Emag = Bmagphot.mag;em.opt.RfloatO-E? O-E color indexmagphot.color;em.opt.B;em.opt.Rfloatn_O-E[b] b for bluemeta.notecharIdentIdentificationmeta.idcharDELTAx? X optical identification position with respect to the X-ray position (2)arcsecpos.angDistancefloatDELTAy? Y optical identification position with respect to the X-ray position (2)arcsecpos.angDistanceint