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1 Introduction
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2 The data
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3 The X-ray spectral analysis
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4 Spectral slope for the bright sample
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5 Results for the complete sample
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6 Intrinsic absorption distribution and its evolution with cosmic epoch
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7 Comparison between X-ray and optical properties
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8 Conclusions
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References
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Online Material
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Appendix A: Fitted X-ray spectra
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Appendix B: Selection of Compton-thick candidates: spectral
simulations
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Appendix C: Measures of
at high-z: simulations
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