The Chandra Deep Field-South Survey: 7 Ms Source Catalogs

Abstract

We present X-ray source catalogs for the $\approx 7$ Ms exposure of the Chandra Deep Field-South (CDF-S), which covers a total area of 484.2 arcmin${}^2$. Utilizing WAVDETECT for initial source detection and ACIS Extract for photometric extraction and significance assessment, we create a main source catalog containing 1008 sources that are detected in up to three X-ray bands: 0.5-7.0 keV, 0.5-2.0 keV, and 2-7 keV. A supplementary source catalog is also provided including 47 lower-significance sources that have bright ($K_s\le 23$) near-infrared counterparts. We identify multiwavelength counterparts for 992 (98.4%) of the main-catalog sources, and we collect redshifts for 986 of these sources, including 653 spectroscopic redshifts and 333 photometric redshifts. Based on the X-ray and multiwavelength properties, we identify 711 active galactic nuclei (AGNs) from the main-catalog sources. Compared to the previous $\approx 4$ Ms CDF-S catalogs, 291 of the main-catalog sources are new detections. We have achieved unprecedented X-ray sensitivity with average flux limits over the central $\approx 1$ arcmin${}^2$ region of $\approx 1.9\times 10^{-17}$, $6.4\times 10^{-18}$, and $2.7\times 10^{-17}$ erg cm${}^{-2}$ s${}^{-1}$ in the three X-ray bands, respectively. We provide cumulative number-count measurements observing, for the first time, that normal galaxies start to dominate the X-ray source population at the faintest 0.5-2.0 keV flux levels. The highest X-ray source density reaches $\approx 50500$ deg${}^{-2}$, and $47\%\pm 4\%$ of these sources are AGNs ($\approx 23900$ deg${}^{-2}$).

31 pages, 31 figures, 8 tables, ApJS in press, minor text updates; full-resolution PDF version and data products available at http://www.astro.psu.edu/users/niel/cdfs/cdfs-chandra.html

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