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dc.contributor.authorDel Carmen Polletta, Maria
dc.contributor.authorWilkes, Belinda J.
dc.contributor.authorSiana, Brian D.
dc.contributor.authorLonsdale, Carol J.
dc.contributor.authorKilgard, Roy E.
dc.contributor.authorSmith, Harding E.
dc.contributor.authorKim, Dongwoo
dc.contributor.authorOwen, Frazer N.
dc.contributor.authorEfstathiou, Andreas
dc.contributor.authorJarrett, Thomas H.M.
dc.contributor.authorStacey, Gordon J.
dc.contributor.authorFranceschini, Alberto
dc.contributor.authorRowan-Robinson, Michael
dc.contributor.authorBabbedge, Tom S.R.
dc.contributor.authorBerta, Stefano
dc.contributor.authorFang, Fan
dc.contributor.authorFarrah, Duncan G.
dc.contributor.authorGonzález-Solares, Eduardo A.
dc.contributor.authorMorrison, Glenn E.
dc.contributor.authorSurace, Jason A.
dc.contributor.authorShupe, David L.
dc.creatorDel Carmen Polletta, Maria
dc.description.abstractUsing the large multiwavelength data set in the Chandra/SWIRE Survey (0.6 deg2 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 ≳1024 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 Chandral 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(0.3-8 keV) > 10-15 ergs cm -2 s-1]. 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.
dc.relation.ispartofAstrophysical Journal
dc.titleChandra and spitzer unveil heavily obscured quasars in the chandra/swire survey
elsevier.issue.identifier2 I
elsevier.coverdisplaydate10 May 2006

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