J/ApJ/642/673ivo://CDS.VizieR/J/ApJ/642/673doi:10.26093/cds/vizier.16420673CDSPolletta M.D.C.Wilkes B.J.Siana B.Lonsdale C.J.Kilgard R.,Smith H.E.Kim D.-W.Owen F.Efstathiou A.Jarrett T.Stacey G.,Franceschini A.Rowan-Robinson M.Babbedge T.S.R.Berta S.Fang F.,Farrah D.Gonzalez-Solares E.Morrison G.Surace J.A.Shupe D.L.2008-08-26T09:01:30Z2008-08-26T08:58:40ZCDS support team

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

cds-question@unistra.frsurveysactive-galactic-nucleiquasarsinfrared-photometryUsing the large multiwavelength data set in the Chandra/SWIRE Survey (0.6deg^2^ in the Lockman Hole), we show evidence for the existence of highly obscured (Compton-thick) AGNs, estimate a lower limit to their surface density, and characterize their multiwavelength properties. Two independent selection methods based on the X-ray and infrared spectral properties are presented. The two selected samples contain (1) five X-ray sources with hard X-ray spectra and column densities >~10^24^cm^-2^ and (2) 120 infrared sources with red and AGN-dominated infrared SEDs. We estimate a surface density of at least 25 Compton-thick AGNs deg^2^ detected in the infrared in the Chandra/SWIRE field, of which 40% show distinct AGN signatures in their optical/near-infrared SEDs, the remaining being dominated by the host galaxy emission. Only ~33% of all Compton-thick AGNs are detected in the X-rays at our depth [F(0.3-8keV)>10^-15^ergs/cm^2^/s]. We report the discovery of two sources in our sample of Compton-thick AGNs, SWIRE J104409.95+585224.8 (z=2.54) and SWIRE J104406.30+583954.1 (z=2.43), which are the most luminous Compton-thick AGNs at high z currently known. The properties of these two sources are discussed in detail with an analysis of their spectra, SEDs, luminosities, and black hole masses.2006ApJ...642..673Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/642/673CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/255 : SWIRE ELAIS N1 Source Catalogs (Surace+, 2004)J/A+A/472/805 : Radio-X-ray sources in the HDF(N) region. (Richards+, 2007)J/A+A/467/73 : 3{sigma} hard sample of XMDS survey (Tajer+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/642/673https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/642/673http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/642/673https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/642/673https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/642/673http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/642/673GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/642/673/table4 (Properties IR-selected obscured AGN candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/642/673/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/642/673/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/642/673/table4?GETtext/xml+votable180.050000true160.8122158.935070.0055555555555555566/6077 6079https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/642/673?format=asciiInfrareddefaultJ/ApJ/642/673/table4Properties IR-selected obscured AGN candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSWIRESource name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharl_r'magUpper 5{sigma} limit flag on r'magmeta.code.errorcharr'magThe r' band Vega magnitude (2)magphot.mag;em.opt.RfloatF3.6The 3.6 micron flux density (2)uJyphot.flux.density;em.IR.3-4umintF4.5The 4.5 micron flux density (2)uJyphot.mag;em.IR.4-8umintl_F5.8Upper 5{sigma} limit flag on F5.8ummeta.code.errorcharF5.8The 5.8 micron flux density (2)uJyphot.mag;em.IR.4-8umintl_F8.0Upper 5{sigma} limit flag on F8.0ummeta.code.errorcharF8.0The 8.0 micron flux density (2)uJyphot.flux.density;em.IR.8-15umintl_F24Upper 5{sigma} limit flag on F24ummeta.code.errorcharF24The 24 micron flux density (2)uJyphot.flux.density;em.IR.15-30umintl_F20cmUpper 5{sigma} limit flag on F20ummeta.code.errorcharF20cm? The 20 cm flux densityuJyphot.flux.density;em.radio.750-1500MHzintnullablee_F20cm? Uncertainty in F20umuJystat.errorintnullablezsp? Spectroscopic redshiftsrc.redshiftfloatnullablezphPhotometric redshiftsrc.redshiftfloatClSource classification (3)meta.code.classcharX[c] Indicates an X-ray detectionmeta.notecharRAJ2000Right Ascension in decimal degrees (J2000) (1)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000) (1)degpos.eq.dec;meta.main