Extended Chandra Deep Field-South survey

The E-CDF-S consists of four contiguous 250ks Chandra observations covering an approximately square region of total solid angle ~0.3{deg}^2^, which flank the existing ~1Ms Chandra Deep Field-South (CDF-S). The survey reaches sensitivity limits of ~1.1x10^-16^ and ~6.7x10^-16^ergs/cm^2^/s for the 0.5-2.0 and 2-8keV bands, respectively.

We detect 762 distinct X-ray point sources within the E-CDF-S exposure; 589 of these sources are new (i.e., not previously detected in the ~1Ms CDF-S). This brings the total number of X-ray point sources detected in the E-CDF-S region to 915 (via the E-CDF-S and ~1Ms CDF-S observations). Source positions are determined using matched-filter and centroiding techniques; the median positional uncertainty is ~0.35".