Chandra Deep Field North: 2-Megasecond X-Ray Point Source Catalog

NASA's Chandra X-ray Observatory catalog contains 755 X-ray sources from the 2-Ms Chandra Deep Field-North survey, including 683 main and 72 supplementary sources. The catalog, created by the HEASARC in August 2016, provides multi-wavelength identifications, redshifts, and source classifications for objects observed between 1999 and 2002. It represents an improvement in flux limits by a factor of ~1.5-2.0 over the previous catalog.

Use Cases

• Identify and classify X-ray point sources based on multi-wavelength counterparts and photometric redshifts.
• Study the density and distribution of active galactic nuclei and galaxies in a deep field survey.
• Analyze source reliability and completeness using the described binomial-probability selection and simulation methods.
• Compare source detection and flux limits with previous catalogs to assess observational improvements.

Strengths

• Catalog contains 755 total sources, with 683 in the main sample and 72 supplementary.
• Includes 234 newly detected sources compared to the previous Alexander et al. (2003) catalog.
• Simulations indicate the main catalog is highly reliable and reasonably complete.
• On-axis mean flux limits show a ~1.5-2.0 improvement over the previous survey limit.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect temporal bias inherent to observations taken between 1999 and 2002.

Provenance

Source

National Aeronautics and Space Administration (NASA), HEASARC

Collection Method

Compiled from 20 separate Chandra ACIS observations.

Time Range

Observations taken between 1999 November 13 and 2002 February 22.

Freshness

Last updated 2026-03-13 18:59:41.395337; freshness should be verified.

Geography

Chandra Deep Field-North (CDF-N) celestial region.