A DEEP OBSERVATION OF QSOS/AGNS IN THE FIELD OF SA 57

SA 57 is one of the best studied sky areas at all wavelengths.We propose a 80 ksXMM observations of this field, which matches the XMM field of view, to detectAGNs down to virgul 0.5, 2 x 10^15 cgs respectively in the 0.52, 210 keV bands.The aim of the project is: i) to detect new absorbed QSOs/AGNs which possiblyescaped optical selection; ii) to perform a comparative study of the optical andXray properties of the AGNs in the field; iii) to estimate the evolution of thedifferent populations of objects and their contribution to the cosmic Xraybackground. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]