MORX: 3.1 Million Optical Objects with Radio and X-Ray Associations
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Description
3,115,575 optical objects are cross-matched with major X-ray and radio surveys to calculate probable associations. The catalog, produced by NASA, includes object classifications, magnitudes, redshifts, and association likelihoods ranging from 40-100% confidence. It was last updated in March 2026.
Use Cases
Classifying unlabeled optical objects as QSOs, galaxies, or stars based on the provided likelihoods.
Identifying candidate double radio lobes based on the catalog's lobe pair identifiers.
Cross-referencing astronomical objects across Chandra, XMM-Newton, NVSS, and FIRST surveys using the provided source identifiers.
Analyzing the correlation between optical magnitudes and the presence of radio or X-ray emissions.
Strengths
Contains 3,115,575 optical objects, providing a large-scale sample for analysis.
Includes over 1.8 million core radio associations from the LoTSS survey and 263,649 X-ray associations from XMM-Newton.
Provides calculated likelihoods for associations and object classifications, adding a probabilistic confidence measure.
Limitations
Column-level documentation is absent; field semantics must be inferred after download.
Row count for the main sample is known, but the total number of rows in the downloadable file is unknown.
Provenance
Source
National Aeronautics and Space Administration
Collection Method
Uniform processing combining the largest published optical, radio, and X-ray sky catalogs.
Time Range
Likely spans the observational periods of the included surveys (e.g., ROSAT, Chandra, NVSS, VLASS).
Freshness
Last updated 2026-03-13 17:53:37.263463; freshness should be verified.
Geography
Sky survey data; spatial coverage is celestial.
License is listed as 'other-license-specified'; terms should be reviewed before use. File formats include BIN and HTML.