X-ray Spectral Constraints for $z\approx$2 Massive Galaxies: The Identification of Reflection-Dominated Active Galactic Nuclei

We use the 4 Ms $Chandra$ Deep Field-South (CDF-S) survey to place direct constraints on the ubiquity of z ≈ 2heavily obscured active galactic nuclei (AGNs) in K < 22 $BzK$-selected galaxies. Forty-seven (≈21%) of the 222$BzK$-selected galaxies in the central region of the CDF-S are detected at X...

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Bibliographic Details
Published in:The Astrophysical journal 2011, Vol.738 (1)
Main Authors: Alexander, D. M., Bauer, F. E., Brandt, W. N., Daddi, Emanuele, Hickox, R. C., Lehmer, B. D., Luo, B., Xue, Y. Q., Young, M., Comastri, A., del Moro, A., Fabian, A. C., Gilli, R., Goulding, A. D., Mainieri, V., Mullaney, J. R., Paolillo, M., Rafferty, D. A., Schneider, D. P., Shemmer, O., Vignali, C.
Format: Article
Language:English
Subjects:
Astrophysics
High Energy Astrophysical Phenomena
Physics
Sciences of the Universe
Online Access:Get full text
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Summary:We use the 4 Ms $Chandra$ Deep Field-South (CDF-S) survey to place direct constraints on the ubiquity of z ≈ 2heavily obscured active galactic nuclei (AGNs) in K < 22 $BzK$-selected galaxies. Forty-seven (≈21%) of the 222$BzK$-selected galaxies in the central region of the CDF-S are detected at X-ray energies, 11 (≈5%) of which havehard X-ray spectral slopes (Γ $^
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/738/1/44