ROSAT All-Sky Survey Single FIRST Matches: 843 X-ray and Radio Source Catalog

NASA HEASARC provides a catalog of 843 X-ray sources from the ROSAT All-Sky Survey with unique radio counterparts from the VLA FIRST survey. The table includes classifications for approximately 51% of the sources, with new spectroscopic data for 85 sources from the FIRST Bright Quasar Survey and 106 from the authors' own observations. This dataset was created in March 2012 based on the original 1997 correlation analysis.

Use Cases

• Analyzing the correlation between X-ray and radio luminosities across radio-loud and radio-quiet regimes based on the described two-decade span.
• Classifying optically faint AGN based on the combined X-ray, radio, and optical counterpart data mentioned.
• Studying the distribution of the radio-loudness parameter in quasars to test the division between radio-quiet and radio-loud AGN.
• Identifying sources with peculiar or unusual properties for detailed follow-up observations as noted in the description.

Strengths

• Focuses on 843 sources with unique radio counterparts, providing a clean sample for analysis.
• Includes classifications for approximately 51% of the sources, with new spectroscopic data for 191 sources (85 from FBQS and 106 new).
• Correlates X-ray and radio data over two decades in radio luminosity, spanning different AGN regimes.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• Excludes 518 X-ray sources with multiple radio matches, which are available in a separate table.

Provenance

Source

National Aeronautics and Space Administration, NASA HEASARC

Collection Method

Correlation of the ROSAT All-Sky Survey (RASS) with the April 1997 release of the VLA FIRST Catalog.

Time Range

Based on 1997 survey data; catalog created March 2012.

Freshness

Last updated 2026-03-13 17:57:45.319707; freshness should be verified.

Geography

All-sky survey.