The Extended Chandra Deep Field-South Survey: Chandra Point-Source Catalogs
Abstract
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 and ~6.7×10-16 ergs cm-2 s-1 for the 0.5-2.0 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 flux ratios expected for normal and starburst galaxies, which lack a strong AGN component. We present basic number-count results for our main Chandra catalog and find good agreement with the ~1 Ms CDF-S for sources with 0.5-2.0 and 2-8 keV fluxes greater than 3×10-16 and 1×10-15 ergs cm-2 s-1, respectively. Furthermore, three extended sources are detected in the 0.5-2.0 keV band, which are found to be likely associated with galaxy groups or poor clusters at z~0.1-0.7 these have typical rest-frame 0.5-2.0 keV luminosities of (1-5)×1042 ergs s-1.
- Publication:
-
The Astrophysical Journal Supplement Series
- Pub Date:
- November 2005
- DOI:
- 10.1086/444590
- arXiv:
- arXiv:astro-ph/0506607
- Bibcode:
- 2005ApJS..161...21L
- Keywords:
-
- Cosmology: Observations;
- Cosmology: Diffuse Radiation;
- Galaxies: Active;
- Surveys;
- X-Rays;
- Astrophysics
- E-Print:
- Accepted for publcation in ApJS (44 pages, 20 figures)