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Title:
Compton-Thick AGN in the SWIRE/Chandra Survey
Authors:
Polletta, M.; Wilkes, B. J.; Siana, B.; Lonsdale, C. J.; Kilgard, R.; Shupe, D. L.; Surace, J.; Smith, H. E.; Kim, D.-W.; Owen, F.
Publication:
The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381, proceedings of the conference held 14-16 November, 2005 in Pasadena, California, USA. Edited by Ranga-Ram Chary, Harry I. Teplitz and Kartik Sheth. San Francisco: Astronomical Society of the Pacific, 2008., p.434
Publication Date:
03/2008
Origin:
ASP
Bibliographic Code:
2008ASPC..381..434P

Abstract

Using the large multi-wavelength data set in the Chandra/SWIRE Survey (0.6 square degrees in the Lockman Hole), we show evidence for the existence of highly obscured (Compton-thick) AGN, estimate a lower limit to their surface density and characterize their multi-wavelength properties. Two independent selection methods based on the X-ray and infrared spectral properties are presented. The two selected samples contain 1) 5 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 spectral energy distributions (SEDs). We estimate a surface density of at least 25 Compton-thick AGN per square degree detected in the IR in the Chandra/SWIRE field of which about 40% show distinct AGN signatures in their optical/near-infrared SEDs, the remainings being dominated by the host-galaxy emission. Only 33% of all Compton-thick AGN are detected in the X-rays at our depth (F(0.3-8 keV)>10^{-15} erg cm^{-2} s^{-1}).

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. The properties of these two sources are discussed in detail with an analysis of their spectra, SEDs, luminosities and black-hole masses.

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