XMM-LSS: X-Ray Source Catalog for 5.5 Square Degrees

3385 point-like or extended X-ray sources were detected in the first 5.5 square degrees surveyed by the XMM-Newton Large-Scale Structure project. The catalog, created by NASA HEASARC in February 2008, provides main parameters like position, count rate, and source extent with associated likelihood values. Additional data products, including X-ray images and optical thumbnails, are available from the Milan XMM-LSS database.

Use Cases

• Analyzing the spatial distribution of X-ray sources based on cataloged positions.
• Studying source properties and populations using count rates and source extent likelihoods.
• Cross-matching X-ray sources with optical counterparts using provided astrometric corrections and external database links.
• Validating detection algorithms by comparing with the reported excellent agreement with deep log N-log S.

Strengths

• Contains 3385 detected sources above a defined likelihood threshold.
• Covers a surveyed area of 5.5 square degrees.
• Provides error estimates for position and count rate derived from simulations.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

NASA HEASARC, based on CDS Catalog J/MNRAS/382/279.

Collection Method

Source detection from XMM-Newton satellite observations in the 0.5-2 keV and 2-10 keV bands.

Time Range

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Freshness

Last updated 2026-03-13 19:31:46.461095; freshness should be verified.

Geography

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