While the recent Chandra and XMM-Newton surveys have generated plentiful AGN samples, they do not detect significant numbers of moderate-luminosity AGN at high redshift (z>3).To pin down the cosmic evolution (i.e., luminosity function) of X-ray emitting AGN up to z~5, the region surrounding the CDF-S is being observed by Chandra to reach comparable depths over an area 4 times larger. The expanded areal coverage is crucial to measure the full extent of the large scale structures evident in the CDF-S and study the AGN clustering properties. We are beginning an optical spectroscopic identification program of the X-ray sources detected in the Extended Chandra Deep Field-South (E-CDF-S) using VLT/VIMOS. With extensive observations of this region in various wavebands (e.g. COMBO-17, GEMS Spitzer/HST, ESO Deep Public Survey), we are carrying out one of the deepest multi-wavelength campaigns to date XRBs and SNRs in the galaxies.
The main characteristics of the E-CDFS are: