AT20G: High-Angular Resolution Catalog of 20-GHz Radio Sources

The Australia Telescope 20-GHz survey catalog provides high-angular-resolution data from the Australia Telescope Compact Array. It identifies compact and extended radio sources, finding compact active galactic nuclei constitute 77% of the total sources. NASA HEASARC created this table in December 2013 based on data from a reference paper.

Use Cases

• Separating compact AGNs from extended radio sources based on visibility data at a 0.15-arcsecond angular scale.
• Classifying 20-GHz radio populations into sub-groups like compact steep-spectrum sources using visibility-spectra diagnostic plots.
• Estimating angular size scales and core flux for extended radio sources based on the visibility catalog.
• Identifying candidate gravitational lenses and binary black holes among the extended flat-spectrum source population.

Strengths

• Provides high-angular-resolution data from the 6-km antenna at baselines of ~4500 m.
• Catalog identifies that 77% of total sources are compact active galactic nuclei.
• Enables separation of sources at a linear size scale of 1 kpc for redshifts higher than 0.7.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data was created in 2013; freshness should be verified for current research.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC).

Collection Method

Created based on machine-readable versions of tables from a reference paper obtained from the MNRAS web site.

Time Range

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Freshness

Last updated 2026-03-13 18:23:29.249730; freshness should be verified.

Geography

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