J/A+A/323/739ivo://CDS.VizieR/J/A+A/323/739doi:10.26093/cds/vizier.33230739CDSBrinkmann W.Siebert J.Feigelson E.D.Kollgaard R.I.,Laurent-Muehleisen S.A.Reich W.Fuerst E.Reich P.Voges W.,Truemper J.McMahon R.1999-11-03T18:58:28Z1999-11-03T19:57:54ZCDS support team

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

cds-question@unistra.frquasarsx-ray-sourcesWe present the broad band, radio - to - X-ray, properties of a large sample of mostly previously optically unidentified radio-loud X-ray sources from the correlation of a ROSAT All-Sky Survey source list with the 5GHz Green Bank Survey of the northern sky (RGB sample) which is one of the largest well-defined flux-limited surveys of AGN ever obtained. Further, the RGB pushes 1-2 orders of magnitude deeper in both X-ray and radio flux compared to previous unbiased wide-area AGN surveys. Follow up VLA observations of the candidate objects yielded positions with arcsec accuracy which were used to find optical counterparts to the sources from digitized POSS plates. The sources are divided into three classes according to the positional offset between the X-ray and radio candidates and the spatial resolution of the radio observations, reflecting the various degrees of confidence about the correctness of the proposed association. Although the nature of the sources as well as their redshifts remain to be determined in spectroscopic follow up observations, the derived flux ratios lead to the conclusion that the majority of them are quasars. Hardly any correlations could be found between different source parameters, possibly due to the fact that most of the objects are found in a relatively small flux range near the sensitivity limit of the radio catalogue. The majority of the new RGB sources have broad-band properties between those of traditional radio-selected and X-ray selected AGN. There is no bimodal distribution in the radio-loudness distribution, and the traditional division between radio-quiet and radio-loud AGN may not be warranted.1997A&A...323..739Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/323/739CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/319/413 : ROSAT detected quasars. I. (Brinkmann+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/323/739https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/323/739http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/323/739https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/323/739https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/323/739http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/323/739GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/323/739/table1 (DELTA(VLA-RASS)<40" unidentified RGB sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/323/739/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/323/739/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/323/739/table1?GETtext/xml+votable180.050000true0.386791714.93555560.005555555555555556Cone search capability for table J/A+A/323/739/table2 (40"<DELTA(VLA-RASS)<100" unidentified RGB sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/323/739/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/323/739/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/323/739/table2?GETtext/xml+votable180.050000true2.220666741.1630.005555555555555556Cone search capability for table J/A+A/323/739/table3 (DELTA(VLA-RASS)<100" unidentified RGB sources, low resolution data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/323/739/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/323/739/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/323/739/table3?GETtext/xml+votable180.050000true0.69458332.15388890.005555555555555556Cone search capability for table J/A+A/323/739/table4 (Previously unidentified RGB sources: VLA empty fields)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/323/739/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/323/739/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/323/739/table4?GETtext/xml+votable180.050000true0.338.3450.005555555555555556ROSAThttps://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/323/739?format=asciiX-raydefaultJ/A+A/323/739/table1DELTA(VLA-RASS)<40" unidentified RGB sourcesNotes[ibgq] Notes (3)charrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intROSATROSAT namecharRAJ2000VLA right ascension (J2000.0)DEJ2000VLA declination(J2000.0)DXradAngular separation of the VLA radio source and the X-ray sourcearcsecintfr5GHz VLA flux density from L97 (1)JyfloatFX0.1 - 2.4 keV X-ray flux1e-15W.m**-2floate_FXrms uncertainty on FX1e-15W.m**-2floatGamma? X-ray photom indexfloatnullablee_Gamma? Error in Gamma (lower limit)floatnullableE_Gamma? Error in Gamma (upper limit)floatnullableEmag? E magnitude of the closest optical counterpart from digitized POSS plates (blank: no plate is available)magfloatnullablen_Emag[e] e: empty fieldscharclE? [-1/2] Optical classification (2)intnullableOmag? O magnitude of the closest optical counterpart from digitized POSS plates (blank: no plate is available)magfloatnullablen_Omag[e] e: empty fieldscharclO? [-1/2] Optical classificationintnullableDVLAOpt? Positional difference between the VLA source and the optical objectarcsecfloatnullableE[*] *: the radio source has been re-observed with the Effelsberg telescope (Reich et al., in prep.)charr_NotesReferences (4)charJ/A+A/323/739/table240"<DELTA(VLA-RASS)<100" unidentified RGB sourcesNotes[ibgq] Notes (3)charrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intROSATROSAT namecharRAJ2000VLA right ascension (J2000.0)DEJ2000VLA declination(J2000.0)DXradAngular separation of the VLA radio source and the X-ray sourcearcsecintfr5GHz VLA flux density from L97 (1)JyfloatFX0.1 - 2.4 keV X-ray flux1e-15W.m**-2floate_FXrms uncertainty on FX1e-15W.m**-2floatGamma? X-ray photom indexfloatnullablee_Gamma? Error in Gamma (lower limit)floatnullableE_Gamma? Error in Gamma (upper limit)floatnullableEmag? E magnitude of the closest optical counterpart from digitized POSS plates (blank: no plate is available)magfloatnullablen_Emag[e] e: empty fieldscharclE? [-1/2] Optical classification (2)intnullableOmag? O magnitude of the closest optical counterpart from digitized POSS plates (blank: no plate is available)magfloatnullablen_Omag[e] e: empty fieldscharclO? [-1/2] Optical classificationintnullableDVLAOpt? Positional difference between the VLA source and the optical objectarcsecfloatnullableE[*] *: the radio source has been re-observed with the Effelsberg telescope (Reich et al., in prep.)charr_NotesReferences (4)charJ/A+A/323/739/table3DELTA(VLA-RASS)<100" unidentified RGB sources, low resolution datar_NotesReferences (4)charNotes[ibgq] Notes (3)charrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intROSATROSAT namecharRAJ2000VLA right ascension (J2000.0)DEJ2000VLA declination(J2000.0)DXradAngular separation of the VLA radio source and the X-ray sourcearcsecintfr5GHz VLA flux density from L97 (1)JyfloatFX0.1 - 2.4 keV X-ray flux1e-15W.m**-2floate_FXrms uncertainty on FX1e-15W.m**-2floatGamma? X-ray photom indexfloatnullablee_Gamma? Error in Gamma (lower limit)floatnullableE_Gamma? Error in Gamma (upper limit)floatnullableEmag? E magnitude of the closest optical counterpart from digitized POSS plates (blank: no plate is available)magfloatnullablen_Emag[e] e: empty fieldscharclE? [-1/2] Optical classification (2)intnullableOmag? O magnitude of the closest optical counterpart from digitized POSS plates (blank: no plate is available)magfloatnullablen_Omag[e] e: empty fieldscharclO? [-1/2] Optical classificationintnullableDVLAOpt? Positional difference between the VLA source and the optical objectarcsecfloatnullableE[*] *: the radio source has been re-observed with the Effelsberg telescope (Reich et al., in prep.)charJ/A+A/323/739/table4Previously unidentified RGB sources: VLA empty fieldsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intROSATROSAT namecharRAJ2000X-ray ascension (J2000)DEJ2000X-ray declination (J2000)DXradAngular separation of the 87GB radio source and the X-ray sourcearcsecintFX0.1-2.4 keV X-ray flux1e-15W.m**-2floate_FX1 sigma statistical error to the X-ray flux1e-15W.m**-2floatGamma? X-ray photon index assuming Galactic absorptionfloatnullablee_Gamma? Photon index lower 1 sigma errorfloatnullableE_Gamma? Photon index upper 1 sigma errorfloatnullablelog(NH)log (Galactic N_H)log(cm**-2)floatF5GHz87GB 5GHz radio flux in JyJyfloatCommComment on possible source identificationchar