9C Survey: 643 Radio Sources at 15.2 GHz for VSA Fields

The 9th Cambridge survey catalog of 643 radio sources observed at 15.2 GHz using the Ryle Telescope, created by NASA HEASARC in November 2010. The data covers multiple survey regions with areas of 529, 115, and 29 square degrees, complete to flux density limits of approximately 25, 10, and 5.5 mJy, respectively. The catalog was compiled to support the Very Small Array cosmic microwave background telescope and includes matched data from the 1.4 GHz NVSS catalog.

Use Cases

• Analyzing radio source counts and distributions based on flux density limits mentioned in the description.
• Investigating the spectral index distribution between 1.4 and 15.2 GHz for flux-limited samples.
• Studying the prevalence of flat and rising spectrum sources in high-frequency selected samples.
• Assessing the limitations of low-frequency catalogs for characterizing high-frequency source populations.
• Cross-matching and validating source detections against the NVSS catalog at 1.4 GHz.

Strengths

• Catalog contains 643 radio sources.
• Survey covers multiple completeness levels: ~25 mJy over 529 deg², ~10 mJy over 115 deg², and ~5.5 mJy over 29 deg².
• Includes matched data with the NRAO VLA Sky Survey (NVSS) at 1.4 GHz for spectral index analysis.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is known (643), but individual column definitions and sample data are unavailable.
• Last updated 2026-03-13 19:02:30.399121; freshness should be verified.

Provenance

Source

NASA HEASARC, based on CDS catalog J/MNRAS/404/1005.

Collection Method

Observational survey using the Ryle Telescope at 15.2 GHz.

Time Range

Survey results published in follow-up to 2003 paper; catalog created November 2010.

Freshness

Last updated 2026-03-13 19:02:30.399121; freshness should be verified.

Geography

Observations target fields of the Very Small Array cosmic microwave background telescope; specific celestial coordinates not provided.