학술논문
The Chandra Deep Field-South Survey: 7 Ms Source Catalogs
Document Type
Report
Author
Luo, B; Brandt, W. N; Xue, Y. Q; Lehmer, B; Alexander, D. M; Bauer, F. E; Vito, F; Yang, G; Basu-Zych, A. R; Comastri, A; Gilli, R; Gu, Q.-S; Hornschemeier, A. E; Koekemoer, A; Liu, T; Mainieri, V; Paolillo, M; Ranalli, P; Rosati, P; Schneider, D. P; Shemmer, O; Smail, I; Sun, M; Tozzi, P; Vignali, C; Wang, J.-X
Source
The Astrophysical Journal Supplement Series. 228(1)
Subject
Language
English
ISSN
1538-4365
0067-0049
0067-0049
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 arcmin2. 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 (Ks < or = 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 arcmin2 region of 1.9 x 10(exp -17), 6.4 x 10(exp -18), and 2.7 x 10(exp -17) erg/sq cm/s 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. 50,500/sq deg, and 47% +/- 4 of these sources are AGNs (approx. 23,900/sq deg).