J/MNRAS/349/135ivo://CDS.VizieR/J/MNRAS/349/135doi:10.26093/cds/vizier.73490135CDSGeorgakakis A.Georgantopoulos I.Vallbe M.Kolokotronis V.,Basilakos S.Plionis M.Stewart G.C.Shanks T.Boyle B.J.2024-06-29T20:14:52Z2005-04-26T21:43:46ZCDS support team

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

cds-question@unistra.frsurveysx-ray-sourcesastronomical-object-identificationIn this paper we investigate the properties of low X-ray-to-optical flux ratio sources detected in a wide-area (2.5{deg}^2^) shallow [fX(0.5-8keV)~10^-14^erg/s/cm^2^] XMM-Newton survey. We find a total of 26 sources (5 per cent of the total X-ray-selected population) with log(fX)/f(opt)<-0.9 to the above flux limit. Optical spectroscopy is available for 20 of these low X-ray-to-optical flux ratio objects.2004MNRAS.349..135Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/349/135CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/226 : 2dF Galaxy Redshift Survey 100k Data Release (2dFGRS Team, 2001)B/xmm : XMM-Newton Observation Log (XMM-Newton SOC, 2002)IX/37 : XMM-Newton Serendipitous Source Catalogue (1XMM) (XMM-SSC, 2003)J/MNRAS/352/91 : XMM-Newton/2dF survey. IV. (Georgantopoulos+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/349/135https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/349/135http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/349/135https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/349/135https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/349/135http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/349/135GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/349/135/table1 (Low X-ray-to-optical flux ratio sources in the XMM-Newton/2dF survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/349/135/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/349/135/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/349/135/table1?GETtext/xml+votable180.050000true206.33925-0.02291670.0055555555555555566/26019-26020 26022 26028 35759 35768 35770https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/349/135?format=asciiX-raydefaultJ/MNRAS/349/135/table1Low X-ray-to-optical flux ratio sources in the XMM-Newton/2dF surveyNameNamecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intSeqSequential numberintRAJ2000X-ray source right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000X-ray source declination (J2000.0)pos.eq.dec;meta.mainOffOffset between the X-ray source centroid estimated by the EWAVELET task of SAS and the optical source centrearcsecfloatBmagB magnitudemagfloatmorph[3/6] Optical morphology of the source (1)intz? Redshiftfloatnullabler_zOrigin of the redshift (2)charClassSpectral classification of the optical counterpartcharCommComments on the spectrum (3)char