AXIS XMM-Newton Source Catalog: 2560 X-ray Sources

AXIS (An XMM International Survey) covers 4.8 square degrees in the Northern sky. The catalog contains 1433 serendipitous X-ray sources detected with 5-sigma significance, with basic data provided for 2560 sources that met selection criteria. The dataset was published by NASA and last updated in March 2026.

Use Cases

• Modeling the contribution of X-ray sources to the cosmic X-ray background based on flux measurements in four energy bands.
• Studying the angular clustering of X-ray selected sources using the novel robust technique described.
• Analyzing the spectral properties of sources using provided photon indices in the 0.5 - 4.5 keV and 2 - 10 keV bands.
• Comparing source count results in soft, hard, XID, and ultra-hard energy bands with other XMM catalogs.

Strengths

• Contains data for 2560 X-ray sources that met the emldetect detection likelihood >= 10 selection criterion.
• Survey covers 4.8 square degrees with 1433 serendipitous sources detected at 5-sigma significance.
• Provides resolved fractions of the X-ray background: 87% in soft, 85% in hard, 60% in XID, and 25% in ultra-hard bands.

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 19:33:12.017119; freshness should be verified.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Combined survey of 36 high Galactic latitude XMM observations, with source counts fitted using a Maximum Likelihood technique.

Freshness

Last updated 2026-03-13 19:33:12.017119

Geography

Northern sky