ChandraandSpitzerUnveil Heavily Obscured Quasars in theChandra/SWIRE Survey | Zendy

M. Polletta | Zendy; B. J. Wilkes | Zendy; Brian Siana | Zendy; Carol J. Lonsdale | Zendy; R. E. Kilgard | Zendy; H. E. Smith | Zendy; DongWoo Kim | Zendy; F. N. Owen | Zendy; A. Efstathiou | Zendy; T. H. Jarrett | Zendy; G. J. Stacey | Zendy; A. Franceschini | Zendy; M. Rowan-Robinson | Zendy; T. Babbedge | Zendy; S. Berta | Zendy; Fan Fang | Zendy; D. Farrah | Zendy; E. González-Solares | Zendy; G. Morrison | Zendy; J. Surace | Zendy; D. L. Shupe | Zendy

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ChandraandSpitzerUnveil Heavily Obscured Quasars in theChandra/SWIRE Survey

Author(s) -

M. Polletta,

B. J. Wilkes,

Brian Siana,

Carol J. Lonsdale,

R. E. Kilgard,

H. E. Smith,

DongWoo Kim,

F. N. Owen,

A. Efstathiou,

T. H. Jarrett,

G. J. Stacey,

A. Franceschini,

M. Rowan-Robinson,

T. Babbedge,

S. Berta,

Fan Fang,

D. Farrah,

E. González-Solares,

G. Morrison,

J. Surace,

D. L. Shupe

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/500821

Subject(s) - physics , astrophysics , active galactic nucleus , infrared , galaxy , quasar , chandra deep field south , astronomy

Using the large multi-wavelength data set in the chandra/SWIRE Survey (0.6square degrees in the Lockman Hole), we show evidence for the existence ofhighly obscured (Compton-thick) AGN, estimate a lower limit to their surfacedensity and characterize their multi-wavelength properties. Two independentselection methods based on the X-ray and infrared spectral properties arepresented. The two selected samples contain 1) 5 X-ray sources with hard X-rayspectra and column densities > 10^24 cm-2, and 2) 120 infrared sources with redand AGN-dominated infrared spectral energy distributions (SEDs). We estimate asurface density of at least 25 Compton-thick AGN per square degree detected inthe infrared in the chandra/SWIRE field of which ~40% show distinct AGNsignatures in their optical/near-infrared SEDs, the remainings being dominatedby the host-galaxy emission. Only ~33% of all Compton-thick AGN are detected inthe X-rays at our depth (F(0.3-8 keV)>10^-15 erg/cm2/s. We report the discovery of two sources in our sample of Compton-thick AGN,SWIRE_J104409.95+585224.8 (z=2.54) and SWIRE_J104406.30+583954.1 (z=2.43),which are the most luminous Compton-thick AGN at high-z currently known. Theproperties of these two sources are discussed in detail with an analysis oftheir spectra, SEDs, luminosities and black-hole masses.Comment: ApJ accepted (to appear in May 2006 issue, vol. 642, of ApJ) Figures 2, 3, and 14 have been degraded due to space consideration

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