ar X iv : a st ro - p h / 05 06 60 7 v 2 5 J ul 2 00 5 The Extended Chandra Deep Field - South Survey . Chandra Point - Source Catalogs

We present Chandra point-source catalogs for the Extended Chandra Deep Field-South (E-CDF-S) survey. The E-CDF-S consists of four contiguous 250 ks Chandra observations covering an approximately square region of total solid angle ≈0.3 deg2, which flank the existing ≈1 Ms Chandra Deep Field-South (CDF-S). The survey reaches sensitivity limits of ≈1.1 × 10−16 erg cm−2 s−1 and ≈6.7 × 10−16 erg cm−2 s−1 for the 0.5–2.0 keV and 2–8 keV 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 ≈1 Ms 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 ≈1 Ms CDF-S observations). Source positions are determined using matched-filter and centroiding techniques; the median positional uncertainty is ≈0.35. The basic X-ray and optical properties of these sources indicate a variety of source types, although absorbed active galactic nuclei (AGNs) seem to dominate. In addition to our main Chandra catalog, we constructed a supplementary source catalog containing 33 lower significance X-ray point sources that have bright optical counterparts (R < 23). These sources generally have X-ray-to-optical Department of Astronomy & Astrophysics, 525 Davey Lab, The Pennsylvania State University, University Park, PA 16802, USA Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, United Kingdom Columbia Astrophysics Laboratory, Columbia University, Pupin Labortories, 550 W. 120th St., Rm 1418, New York, NY 10027, USA INAF Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34131 Trieste, Italy Institut d’Astrophysique de Paris, 98bis Boulevard, F-75014 Paris, France Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA Istituto Nazionale di Astrofisica (INAF) Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching b. München, Germany Laboratory for X-ray Astrophysics, NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA European Southern Observatory, Karl-Schwarzschild-Strasse 2, Garching, D-85748, Germany Dipartimento di Astronomia, Universitá degli Studi di Bologna, Via Ranzani 1, 40127 Bologna, Italy