X-Ray luminosities for ~41000 AGNs J/ApJ/908/185 ivo://CDS.VizieR/J/ApJ/908/185 doi:10.26093/cds/vizier.19080185 CDS Carroll C.M. Hickox R.C. Masini A. Lanz L. Assef R.J. Stern D.,Chen C.-T.J. Ananna T.T. 2024-11-06T20:22:59Z 2024-03-12T06:27:25Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr x-ray-sources infrared-astronomy active-galactic-nuclei quasars redshifted We present a large sample of infrared-luminous candidate active galactic nuclei (AGNs) that lack X-ray detections in Chandra, XMM-Newton, and NuSTAR fields. We selected all optically detected SDSS sources with redshift measurements, combined additional broadband photometry from WISE, UKIDSS, 2MASS, and GALEX, and modeled the spectral energy distributions (SEDs) of our sample sources. We parameterize nuclear obscuration in our SEDs with E(B-V)_AGN_ and uncover thousands of powerful obscured AGNs that lack X-ray counterparts, many of which are identified as AGN candidates based on straightforward WISE photometric criteria. Using the observed luminosity correlation between rest-frame 2-10 keV (L_X_) and rest-frame AGN 6um (L_MIR_), we estimate the intrinsic X-ray luminosities of our sample sources and combine these data with flux limits from X-ray catalogs to determine lower limits on nuclear obscuration. Using the ratio of intrinsic-to-observed X-ray luminosity (R_L_X__), we find a significant fraction of sources with column densities approaching N_H_>10^24^/cm^2^, suggesting that multiwavelength observations are necessary to account for the population of heavily obscured AGNs. We simulate the underlying N_H_ distribution for the X-ray non-detected sources in our sample through survival analysis, and confirm the presence of AGN activity via X-ray stacking. Our results point to a considerable population of extremely obscured AGNs undetected by current X-ray observatories. 2021ApJ...908..185C https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/908/185 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to IX/45 : The Chandra Source Catalog, Release 1.1 (Evans+ 2012) II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012) II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012) II/335 : Catalog of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017) IX/55 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR8 (XMM-SSC, 2018) IX/57 : The Chandra Source Catalog (CSC), Release 2.0 (Evans+, 2019) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) J/ApJ/662/808 : Cusp radius in luminous elliptical galaxies (Lauer+, 2007) J/AJ/136/2373 : Type 2 quasars from SDSS (Reyes+, 2008) J/ApJ/713/970 : Low-resolution SED templates for AGNs & galaxies (Assef+, 2010) J/ApJS/200/8 : AGES; the AGN and Galaxy Evolution Survey (Kochanek+, 2012) J/ApJS/208/24 : Spitzer MIR AGN survey. I. (Lacy+, 2013) J/ApJ/808/185 : NuSTAR surveys; COSMOS catalog (Civano+, 2015) J/ApJ/807/129 : X-ray to MIR luminosities relation of AGNs (Stern, 2015) J/ApJS/234/23 : The WISE AGN candidates catalogs (Assef+, 2018) J/ApJ/865/43 : Xray stacking analysis of Chandra-COSMOS gal (Fornasini+, 2018) J/ApJS/235/17 : NuSTAR Extragalactic Surveys; UDS field (Masini+, 2018) J/ApJ/876/50 : Xray & MIR AGNs Stripe 82 with eBOSS spectra (LaMassa+, 2019) J/ApJS/243/3 : Chandra observations of SINGS galaxies (Lehmer+, 2019) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/908/185 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/908/185 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/908/185 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/908/185 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/908/185 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/908/185 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/908/185/table3 (Source positions and X-ray luminosity estimates by observatory) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/908/185/table3? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/908/185/table3? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/908/185/table3? 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28402 28413-28415 28417 28426-28427 28430 28441 28443-28444 28446 28448-28449 28452 28454 28460-28461 28466-28467 28471 28483 28488-28490 28492 28494-28497 28499 28506-28507 28516-28518 28522-28523 28528-28529 28531-28532 28534-28535 28540-28542 28548 28553 28555 28581 28583 28589 28593-28596 28608-28609 28611 28619 28626 28630-28632 28634 28636-28637 28639 28647 28653 28661 28663 28667 31389 31391 31459 31465 31650 31656 31717 32481 32484 32500 32503 32686-32687 36342-36343 36534 36545 36618 36733 36770-36771 36773-36775 36777-36782 36784-36786 36788 36798-36799 40943 40950-40951 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/908/185?format=ascii X-ray Infrared default J/ApJ/908/185/table3 Source positions and X-ray luminosity estimates by observatory recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int SDSS SDSS ObjID meta.id;meta.main RAJ2000 [0/360] Right Ascension in degrees (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 [-22/82] Declination in degrees (J2000) deg pos.eq.dec;meta.main indexed l_Lxcha Upper limit flag for Chandra source meta.code.error char Lxcha ? X-ray luminosity for Chandra source W phys.luminosity;em.X-ray double nullable e_Lxcha ? X-ray luminosity error for Chandra source W stat.error double nullable l_Lxxmm Upper limit flag for XMM source meta.code.error char Lxxmm ? X-ray luminosity for XMM source W phys.luminosity;em.X-ray double nullable e_Lxxmm ? X-ray luminosity error for XMM source W stat.error double nullable l_Lxnst Upper limit flag for NuSTAR source meta.code.error char Lxnst ? X-ray luminosity for NuSTAR source W phys.luminosity;em.X-ray double nullable e_Lxnst ? X-ray luminosity error for NuSTAR source W stat.error double nullable Field Final X-ray field used for analysis (1) instr.setup;obs.field char
J/ApJ/908/185/table4 SED modeling output parameters. recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int z [0/0.8] Redshift (1) src.redshift float e_z [0/0.5] Redshift error stat.error;src.redshift float (B-V) [0/50.1] Color excess (1) phot.color;em.opt.B;em.opt.V float e_(B-V) [0/51] Color excess error (2) stat.error float cAGN [5e-19/4e-14]? AGN template normalization (1) stat.fit.param double nullable cell [1e-20/2.9e-13]? Elliptical template normalization (1) stat.fit.param double nullable cSFG [4e-20/2e-13]? Star-forming template normalization (1) stat.fit.param double nullable cIRR [9e-20/9e-14]? Irregular/starburst template normalization (1) stat.fit.param double nullable chi2 [0.14/9692874] Chi-squared (1) stat.fit.chi2 double dchi2 [2/12] Degrees of Freedom stat.fit.dof int pAGN [0/100] Percent of realisations with AGN (3) % stat.value;arith.ratio int LIR ? AGN 6um IR luminosity (1) W phys.luminosity;em.IR double nullable e_LIR ? AGN 6um IR luminosity error (2) W stat.error double nullable wiseAGN [0/1] WISE AGN flag (0=false, 1=true) meta.code int