J/A+A/694/A241ivo://CDS.VizieR/J/A+A/694/A241doi:10.26093/cds/vizier.36940241CDSGuo X.Gu Q.Fang G.Chen Y.Ding N.Yu X.Wang H.2025-05-21T20:01:49Z2025-02-18T09:19:32ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleix-ray-sourcesCompton-thick active galactic nuclei (CT-AGNs), characterized by a significant absorption with column densities of N_H_>=1.5x10^24^cm^-2^, emit feeble X-ray radiation, even undetectable by X-ray instruments, making them difficult to identify. The X-ray radiations from AGNs are the predominant origin of the cosmic X-ray background (CXB). Based on the AGN synthesis models for the CXB, the fraction of CT-AGNs should constitute a substantial portion, approximately 30% or more. The fraction of CT-AGNs discovered in the Cosmological Evolution Survey (COSMOS) is significantly lower than this value. These mean that many CT-AGNs may be hidden in AGNs that exhibit low photon counts or that have not been detected by X-ray instruments. This work focuses on identifying CT-AGNs hidden in AGNs with low photon counts. Firstly, we selected 440 AGNs with abundant multiwavelength data as our sample. Secondly, we analyzed multiwavelength data, extracting crucial physical parameters required for the CT-AGN diagnosis. Finally, we used the multiwavelength approaches to identify CT-AGNs. We have successfully identified 18 CT-AGNs in our sample. Among the CT-AGNs, four AGNs showed discrepant results across different diagnostic methods. We discussed the potential reasons behind these diagnostic discrepancies. We explored the impact of estimating [OIII]{lambda}5007 luminosities based on [OII]{lambda}3727 luminosities for the CT-AGN diagnosis. We also found that the properties of host galaxies for CT-AGNs and non-CT-AGNs did not show significant discrepancies.2025A&A...694A.241Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/694/A241CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/819/62 : The COSMOS-Legacy Survey (CLS) catalog (Civano+, 2016)J/ApJ/817/34 : C-COSMOS Legacy sources multiwavelength catalog (Marchesi+ 2016)J/ApJ/858/77 : DEIMOS 10K spectroscopic survey in COSMOS field (Hasinger+ 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/694/A241https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/694/A241http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/694/A241https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/694/A241https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/694/A241http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/694/A241GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/694/A241/tablea1 (Physical properties of our AGN sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/694/A241/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/694/A241/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/694/A241/tablea1?GETtext/xml+votable180.050000true149.67272.00580.0055555555555555565/6814 6/27245 27247 27344https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/694/A241?format=asciiX-raydefaultJ/A+A/694/A241/tablea1Physical properties of our AGN samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXIDIDs of X-ray sources from the 7Ms catalog, Civano et al., 2016ApJ...819...62C, Cat. J/ApJ/819/62meta.id;meta.maincharRAJ2000Right ascension (J2000) of the X-ray source from the 7Ms catalog, Civano et al., 2016ApJ...819...62C, Cat. J/ApJ/819/62degpos.eq.ra;meta.mainDEJ2000Declination (J2000) of the X-ray source from the 7Ms catalog, Civano et al., 2016ApJ...819...62C, Cat. J/ApJ/819/62degpos.eq.dec;meta.mainzRedshiftsrc.redshiftfloatf_zType of redshift, including "spec", "photo" and "my-photo"meta.codecharr_zReferences of redshift (1)meta.ref;pos.framecharl_logLX[<] < for lower limit on logLXmeta.code.errorcharlogLXLog of observed 2-10keV luminosity in the rest-framelog(1e-07W)phys.luminosity;em.X-rayfloatlogL6um? Log of 6um luminosity for an AGN in the rest-framelog(1e-07W)phys.luminosity;em.IR.4-8umfloatnullableAlphaAGN? Confidence of AGN components for SED fittingstat.fit.paramdoublenullablelogMass? Log of the stellar masslog(solMass)phys.massfloatnullablelogSFR? Log of the star formation ratelog(solMass.yr**-1)meta.idfloatnullablelogLOIII? Log of [OIII] luminositylog(1e-07W)phys.luminosityfloatnullableSNR-OIII? Signal-to-noise ratio of the [OIII] emission linestat.snrfloatnullablelogLOII? Log of [OII] luminositylog(1e-07W)phys.luminosityfloatnullableSNR-OII? Signal-to-noise ratio of the [OII] emission linestat.snrfloatnullablelogLNeV? Log of [NeV] luminositylog(1e-07W)phys.luminosityfloatnullableSNR-NeV? Signal-to-noise ratio of the [NeV] emission linestat.snrfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharnullable