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American Astronomical Society, Astrophysical Journal, 1(738), p. 44, 2011

DOI: 10.1088/0004-637x/738/1/44

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X-Ray SPECTRAL CONSTRAINTS FORz≈ 2 MASSIVE GALAXIES: THE IDENTIFICATION OF REFLECTION-DOMINATED ACTIVE GALACTIC NUCLEI

Journal article published in 2011 by D. M. Alexander, F. E. Bauer, W. N. Brandt, E. Daddi, R. C. Hickox, B. D. Lehmer, B. Luo, Y. Q. Xue, M. Young, A. Comastri, A. Del Moro, A. C. Fabian, R. Gilli ORCID, A. D. Goulding, V. Mainieri and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

ApJ in press: 15 pages, 6 figures, 3 tables ; International audience ; We use the 4Ms CDF-S survey to place direct X-ray constraints on the ubiquity of z~2 heavily obscured AGNs in K10 keV observatories. On the basis of these analyses we estimate the space density for typical (intrinsic X-ray luminosities of L_X>1E43 erg/s) heavily obscured and Compton-thick AGNs at z~2. Our space-density constraints are conservative lower limits but they are already consistent with the range of predictions from X-ray background models.