4XMM-DR14s: XMM-Newton Stacked X-Ray Source Catalog with 427,524 Unique Sources

The XMM-Newton Serendipitous Source Catalog from Stacked Observations contains 427,524 unique X-ray sources, with 329,972 observed multiple times. Compiled by NASA from 10,336 overlapping XMM-Newton observations taken between 2000 and 2023, it provides source parameters like fluxes and hardness ratios derived from simultaneous fits. The catalog includes 1,807,316 individual flux measurements aimed at studying long-term variability of X-ray emitting sources.

Use Cases

• Analyzing long-term flux variability of X-ray sources based on multiple overlapping observations.
• Studying source population statistics and hardness ratios across standard X-ray energy bands.
• Investigating astrometric corrections and source detection quality flagged by automated and manual processes.

Strengths

• Contains 427,524 unique sources, with 329,972 multiply observed for variability analysis.
• Derived from 10,336 overlapping observations, providing long effective exposure times per sky area.
• Includes 1,807,316 individual flux measurements and parameters from simultaneous fits.

Limitations

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

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Compiled from stacked source detection on overlapping XMM-Newton public observations.

Time Range

2000 February 1 to 2023 November 16

Freshness

Last updated 2026-03-13 18:22:19.770876; freshness should be verified.

Geography

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