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Article Contents

ABSTRACT

1.INTRODUCTION
1.1.History of the Cosmic X-ray background
1.2.Constraints from the Cosmic X-ray background

2.ADVANCES IN THE MEASUREMENT OF THE COSMIC X-RAY BACKGROUND

3.HARD X-RAY SURVEYS
3.1.The role of absorption
3.2.Compton-thick AGNs in the local Universe
3.3.Compton-thick AGNs in the high-z Universe

4.REFLECTION AND CUT-OFF PROPERTIES OF AGNs

5.UNVEILING THE HARD X-RAY SKY: THE SIX SURVEY

6.CONCLUSIONS

REFERENCES