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

Abstract

We present X-ray source catalogs for the ≈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 23 s ) 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 ≈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 ≈1 arcmin 2 region of ≈1.9×10 −17 , 6.4×10 −18 , and 2.7×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 ≈50,500 deg −2 , and 47%±4% of these sources are AGNs (≈23,900 deg −2 ).

A Magellan M2FS Spectroscopic Survey of Galaxies at 5.5 < z < 6.8: Program Overview and a Sample of the Brightest Lyα Emitters

“…It is partly covered by deep X-ray data (e.g., Lehmer et al 2005;Xue et al 2016;Luo et al 2017), as well as other multi-wavelength data. In particular, it is partly covered by several HST deep fields.…”

The Intrinsic Characteristics of Galaxies on the SFR–M∗ Plane at 1.2 < z < 4: I. The Correlation between Stellar Age, Central Density, and Position Relative to the Main Sequence

“…Additionally, we look at the fraction of AGN classified from the latest deep Chandra images in GOODS North by Xue et al (2016) and by Luo et al (2017) in GOODS-South. AGN hosts are classified among X-ray sources if they satisfy one of the six criteria listed in Luo et al (2017) (see Section4.7, paragraph 2).…”

“…AGN hosts are classified among X-ray sources if they satisfy one of the six criteria listed in Luo et al (2017) (see Section4.7, paragraph 2). There are 97/380 AGN hosts among massive galaxies in the MS-namely 26% with a Poisson uncertainty, 0.03.…”

Luminous and Obscured Quasars and Their Host Galaxies

“…We note that amongst the X-ray undetected quasars in the sample, there is one source, #28 (see Table 1 from Del Moro et al, 2016), that is now detected in the 7 Ms CDF-S catalog (XID 28; Luo et al, 2017). This source has a very flat effective photon index of Ŵ < 0.93 (compared to the typical Ŵ ≈ 1.8 for unabsorbed AGN) and an extremely low rest-frame X-ray luminosity (L 0.5−7 keV ≈ 1.5 × 10 41 erg s −1 , uncorrected for absorption) compared to its intrinsic luminosity measured in the MIR band (log ν L 6 µm = 45.97 erg s −1 ), consistent with the upper limit reported in our analysis (Del Moro et al, 2016) 1 , supporting our assumption that the source might be a heavily obscured, CT quasar.…”