J/A+A/424/545ivo://CDS.VizieR/J/A+A/424/545doi:10.26093/cds/vizier.34240545CDSPadovani P.Allen M.G.Rosati P.Walton N.A.2017-11-06T12:23:20Z2006-06-02T09:10:38ZCDS support team

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

cds-question@unistra.frquasarsactive-galactic-nucleix-ray-sourcesWe use Virtual Observatory (VO) tools to identify optically faint, obscured (i.e., type 2) active galactic nuclei (AGN) in the two Great Observatories Origins Deep Survey (GOODS) fields. By employing publicly available X-ray and optical data and catalogues we discover 68 type 2 AGN candidates.2004A&A...424..545Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/424/545CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/126/539 : The Chandra Deep Fields North and South (Alexander+, 2003)J/ApJS/155/271 : Chandra Deep Field-South: Optical spectroscopy (Szokoly+ 2004)II/258 : Hubble Ultra Deep Field Catalog (UDF) (STScI, 2004)II/261 : GOODS initial results (Giavalisco+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/424/545https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/424/545http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/424/545https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/424/545https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/424/545http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/424/545GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/424/545/agn2 (Type 2 AGNs (tables 1, 2 and 4 of paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/424/545/agn2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/424/545/agn2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/424/545/agn2?GETtext/xml+votable180.050000true188.929083362.19566670.0055555555555555566/11252 35935https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/424/545?format=asciiX-raydefaultJ/A+A/424/545/agn2Type 2 AGNs (tables 1, 2 and 4 of paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintUDF? UDF designation (Cat. II/258, table 4 only)meta.idintnullableFSimbad column added by the CDSobs.fieldcharA03Alexander et al. (2003, Cat. <J/AJ/126/539> sequential number, [ABB2003] CDFS NNN in Simbadmeta.idintS04? Szokoly et al. (2004, Cat. <J/ApJS/155/271> sequential number, [SBH2004] XID NNNa in Simbad (table2 only)meta.idintnullablem_S04[a] Multiplicity index on S04meta.code.multipcharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainOffsetOffset between X-ray and optical positionsarcsecpos.angDistancefloatFlux? Flux in the 0.5-8keV band (10-15erg/cm2/s)aW.m**-2phot.flux;em.X-ray.mediumfloatnullableHR? Hardness ratio, HR=(H-S)/(H+S) (1)phot.flux;arith.ratiofloatnullableimagACS i magnitudemagphot.mag;em.opt.Ifloate_imagrms uncertainty on imagmagstat.error;phot.magfloatlogLXX-ray luminosity in 2-8keV bandlog(1e-07W)phys.luminosity;em.X-rayfloatGOODSGOODS designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.mainchar