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

List of tables
List of figures

Copyright ESO 2006
Published by EDP Sciences