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Title:
Chandra and Spitzer Unveil Heavily Obscured Quasars in the Chandra/SWIRE Survey
Authors:
Polletta, Maria del Carmen; Wilkes, Belinda J.; Siana, Brian; Lonsdale, Carol J.; Kilgard, Roy; Smith, Harding E.; Kim, Dong-Woo; Owen, Frazer; Efstathiou, Andreas; Jarrett, Tom; Stacey, Gordon; Franceschini, Alberto; Rowan-Robinson, Michael; Babbedge, Tom S. R.; Berta, Stefano; Fang, Fan; Farrah, Duncan; González-Solares, Eduardo; Morrison, Glenn; Surace, Jason A.; Shupe, Dave L.
Affiliation:
AA(Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0424.), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AC(Spitzer Science Center, California Institute of Technology, 100-22, 1200 East California Boulevard, Pasadena, CA 91125.; Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, operated by AURA, Inc., under cooperative agreement with the National Science Foundation.), AD(Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0424.; Infrared Processing and Analysis Center, California Institute of Technology, 100-22, Pasadena, CA 91125.), AE(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AF(Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0424.; Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, operated by AURA, Inc., under cooperative agreement with the National Science Foundation.), AG(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AH(Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, operated by AURA, Inc., under cooperative agreement with the National Science Foundation.; National Radio Astronomy Observatory, P.O. Box O, 1003 Lopezville Road, Socorro, NM 87801.), AI(School of Computer Science and Engineering, Cyprus College, 6 Diogenes Street, Engomi, 1516 Nicosia, Cyprus.), AJ(Infrared Processing and Analysis Center, California Institute of Technology, 100-22, Pasadena, CA 91125.), AK(Department of Astronomy, Cornell University, 610 Space Sciences Building, Ithaca, NY 14853.), AL(Dipartimento di Astronomia, Universitá di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, Italy.), AM(Astrophysics Group, Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BW, UK.), AN(Astrophysics Group, Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BW, UK.), AO(Dipartimento di Astronomia, Universitá di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, Italy.), AP(Spitzer Science Center, California Institute of Technology, 100-22, 1200 East California Boulevard, Pasadena, CA 91125.), AQ(Department of Astronomy, Cornell University, 610 Space Sciences Building, Ithaca, NY 14853.), AR(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK.), AS(Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, operated by AURA, Inc., under cooperative agreement with the National Science Foundation.; Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; and Canada-France-Hawaii Telescope, 65-1238 Mamalahoa Highway, Kamuela, HI 96743-8432.), AT(Spitzer Science Center, California Institute of Technology, 100-22, 1200 East California Boulevard, Pasadena, CA 91125.), AU(Spitzer Science Center, California Institute of Technology, 100-22, 1200 East California Boulevard, Pasadena, CA 91125.)
Publication:
The Astrophysical Journal, Volume 642, Issue 2, pp. 673-693. (ApJ Homepage)
Publication Date:
05/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Active, Infrared: Galaxies, quasars: individual (SWIRE J104409.95+585224.8), quasars: individual (SWIRE J104406.30+583954.1), X-Rays: Galaxies
DOI:
10.1086/500821
Bibliographic Code:
2006ApJ...642..673D

Abstract

Using 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 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(0.3-8 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.

Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. Based on observations at the Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under a cooperative agreement by Associated Universities, Inc.


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