The Extended Chandra Deep Field South Survey: X-ray Point-Source Catalog

Abstract

The Extended Chandra Deep Field South (E-CDF-S) survey consists of 4 Chandra ACIS-I pointings and covers ~ 1100 square arcminutes (~ 0.3 deg$^2$) surrounding the original CDF-S field to a depth of approximately 228 ks. This is the largest Chandra survey ever conducted at such depth and only one XMM-Newton survey reaches a lower flux limit in the hard 2.0--8.0 keV band. We detect 642 unique sources, of which 532 are detected in the full 0.5--8.0 keV band, 480 in the soft 0.5--2.0 keV band, and 334 in the hard 2.0--8.0 keV band. For point sources near the aim point, the limiting fluxes are approximately 1.8 x 10^{-16} erg cm^{-2} s^{-1} and 7.8 x 10^{-16} erg cm^{-2} s^{-1} in the 0.5--2.0 keV and 2.0--8.0 keV bands, respectively. We present the differential and cumulative flux distributions, which are in good agreement with the number counts from previous deep X-ray surveys and with the predictions from an AGN population synthesis model that can explain the X-ray background. In general, fainter sources have harder X-ray spectra, consistent with the hypothesis that these sources are mainly obscured AGN.