CLANS: Chandra X-Ray Source Catalog for 0.6 Square Degrees

761 X-ray point sources detected in the Chandra Lockman Area North Survey (CLANS). The catalog covers a solid angle of approximately 0.6 square degrees, reaching specific flux sensitivities in the 0.5-2 keV and 2-8 keV energy bands. NASA HEASARC created this table in December 2008 based on data from the Astrophysical Journal.

Use Cases

• Analyzing the log N-log S distribution of X-ray sources based on the flux range covering its observed break.
• Studying the population of sources that contribute the bulk of the 2-8 keV X-ray background.
• Cross-matching X-ray sources with optical and infrared counterparts using the related CLANSOID table.
• Bridging observational gaps between ultra-deep pencil-beam surveys and shallower, large-area surveys.

Strengths

• Contains 761 distinct X-ray point sources.
• Covers a defined area of ~0.6 square degrees with nine coordinated 70 ks Chandra ACIS-I exposures.
• Reaches specific flux limits: 7e-16 ergs cm^-2 s^-1 (0.5-2 keV) and 3.5e-15 ergs cm^-2 s^-1 (2-8 keV).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-03-13 20:14:13.565262; freshness should be verified.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC), based on data from the Astrophysical Journal.

Collection Method

Combined nine individual 70 ks Chandra ACIS-I pointing catalogs following a prescribed merging method.

Time Range

Observational details are provided in a reference paper; specific observation dates are not stated in the description.

Freshness

Last updated 2026-03-13 20:14:13.565262; freshness should be verified.

Geography

Sky survey centered at J2000.0 RA and Dec of (10 46, +59 01).