AT20G Bright Source Sample: 320 Southern Sky Radio Sources at 20 GHz

The Australia Telescope 20-GHz Survey Bright Source Sample is a flux-limited catalog of 320 extragalactic radio sources south of declination -15 degrees. Observations were conducted with the Australia Telescope Compact Array from 2004 to 2007, with near-simultaneous multi-frequency data for a subset. NASA HEASARC created this table in August 2008 based on source files from the CDS.

Use Cases

• Analyze radio spectral properties in total intensity and polarization based on multi-frequency observations.
• Study source size and morphology using the survey's follow-up observations.
• Investigate optical identifications and redshift distributions for extragalactic sources.
• Model the population of bright, high-frequency radio sources in the southern sky.

Strengths

• Complete flux-limited sample of 320 sources with a defined flux density cutoff of >0.50 Jy.
• Includes near-simultaneous observations at 8 and 5 GHz for 218 of the 320 sources.
• Provides redshift estimates for 186 sources with median values specified for different source types.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect temporal bias inherent to the 2004-2007 observation period.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC), based on CDS Catalog J/MNRAS/384/775.

Collection Method

Blind survey of the southern sky using the Australia Telescope Compact Array.

Time Range

2004 to 2007

Freshness

Last updated 2026-03-13 16:37:59.019140; freshness should be verified.

Geography

Whole southern sky (south of declination -15 degrees)