Chandra Deep Field South: 740 X-ray Sources from 4-Megasecond Survey
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Description
The 4-megasecond Chandra Deep Field-South survey is the deepest X-ray survey to date, covering 464.5 arcmin². It contains a main catalog of 740 X-ray sources detected with high reliability, including 300 new sources not in the previous 2 Ms catalog. The catalog, provided by NASA, includes multiwavelength identifications, photometry, and redshifts for the majority of sources, with analysis indicating over 75% are active galactic nuclei.
Use Cases
Studying the population and properties of active galactic nuclei based on X-ray source classifications.
Analyzing the rise of normal and starburst galaxies at faint X-ray flux levels.
Cross-matching X-ray sources with optical/infrared/radio counterparts using provided multiwavelength identifications.
Investigating source density and completeness of deep X-ray surveys using the provided reliability and completeness metrics.
Strengths
Contains 740 X-ray sources detected with high reliability, using a false-positive probability threshold of 10⁻⁵ and a binomial-probability source-selection criterion of P < 0.004.
Provides multiwavelength counterparts for 716 (~97%) of the main-catalog sources, with redshifts for 673 (~94%) of those.
Achieves a median positional uncertainty of ~0.42 arcseconds for source locations.
Reaches on-axis flux limits of approximately 3.2 × 10⁻¹⁷ erg cm⁻² s⁻¹ (0.5–8 keV), enabling detection of very faint sources.
Limitations
Column-level documentation is absent; field semantics must be inferred after download.
Row count is unknown, which may limit suitability assessment.
The supplementary catalog of 36 sources mentioned in the description is not included in this table.
Provenance
Source
National Aeronautics and Space Administration (NASA)
Collection Method
Observations from the Chandra X-ray Observatory, processed with wavdetect and matched-filter techniques.
Freshness
Last updated 2026-03-13 17:20:53.606058; freshness should be verified.
Geography
Covers the Chandra Deep Field-South region, an area of 464.5 arcmin².
License is listed as 'other-license-specified'; specific terms should be reviewed. Data is provided in BIN and HTML formats.