XMM-LSS: Deep Full-Exposure X-Ray Source Catalog for 11.1 Square Degrees

The XMM-Newton Large-Scale Structure survey covers an area of 11.1 square degrees. This final release catalog from NASA HEASARC, created in February 2013, contains 6,721 X-ray sources detected in soft (0.5-2 keV) or hard (2-10 keV) energy bands above a detection likelihood threshold of 15.

Use Cases

• Identifying galaxy clusters and groups based on extended X-ray source classifications.
• Cross-matching X-ray sources with optical and infrared counterparts using the associated multiwavelength catalog.
• Analyzing source properties in different energy bands (0.5-2 keV and 2-10 keV).
• Studying the spatial distribution of X-ray sources for large-scale structure analysis.

Strengths

• Contains 6,721 X-ray sources, superseding an earlier catalog covering only 5 square degrees.
• Sources are filtered for reliability with a detection likelihood threshold greater than 15.
• Associated multiwavelength catalog and data products (images, thumbnails) are available from a maintained database.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is known, but specific column definitions and data types are not provided in the metadata.

Provenance

Source

National Aeronautics and Space Administration (NASA) HEASARC, based on CDS catalog J/MNRAS/429/1652.

Collection Method

Processed from 124 XMM-Newton observations using the XAMIN pipeline, with sources limited to an off-axis angle < 13 arcmin.

Time Range

Observational data likely spans the period of the XMM-LSS survey, but specific dates are not provided.

Freshness

Last updated 2026-03-13 18:30:48.983296; freshness should be verified as the underlying data is from 2013.

Geography

Covers a specific 11.1 square degree area of the sky targeted by the XMM-LSS survey.