ARXA: Atlas of 602,570 Optical Objects Associated with Radio and X-Ray Sources

602,570 cataloged optical objects associated with radio and X-ray detections from instruments including NVSS, FIRST, XMM-Newton, and Chandra. The catalog, created by an author associated with [email protected] and hosted by NASA, provides sky coordinates, photometry, redshift, and calculated odds for object classification. It was last updated on 2026-03-13 and supersedes the previous Quasars.org (QORG) Catalog.

Use Cases

• Classifying astronomical objects (quasar, galaxy, star) based on calculated odds provided for each entry.
• Cross-matching optical sources with radio and X-ray detections using the listed identifiers.
• Analyzing photometric properties of celestial objects using the APM and USNO-A sourced red and blue photometry.
• Studying associations between double radio lobes and their core optical counterparts.

Strengths

• Large scale with 602,570 optical object entries.
• Integrates data from multiple major astronomical surveys and missions (e.g., 266,148 NVSS core associations, 57,778 XMM associations).
• Provides probabilistic classification (odds) for object types, aiding analysis.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count for the final compiled table is unknown, which may limit suitability assessment.
• Data may reflect observational bias inherent to the source surveys and their sky coverage.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Compilation of associations from cataloged optical objects (APM/USNO-A) with detections from specified radio and X-ray telescopes.

Time Range

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Freshness

Last updated 2026-03-13 18:17:11.591748; freshness should be verified.

Geography

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