AT20G/Fermi 1FGL: 233 Cross-Matched Radio and Gamma-Ray AGN Sources

233 matched sources link the Australia Telescope 20-GHz survey with the Fermi-LAT 1-year Point Source Catalog to investigate radio-gamma-ray relationships in extragalactic objects. The catalog covers 6.0 steradians of the southern sky (Declination < 0 degrees) and was created by NASA HEASARC in August 2010. Monte Carlo tests indicate at least 95% of the associations are genuine, and the data reveals a trend of increasing gamma-ray flux with higher 20 GHz radio flux.

Use Cases

• Training models to predict gamma-ray emission from radio flux density based on the described trend.
• Validating AGN associations in gamma-ray catalogs using high-precision radio source positions.
• Identifying candidate gamma-ray AGNs from the eight matched AT20G sources with no prior 1FGL association.
• Studying the distribution of unidentified Galactic gamma-ray sources toward the Galactic plane.
• Analyzing source multiplicity within error ellipses, as only 1% of Fermi sources had more than one radio counterpart.

Strengths

• Contains 233 matched sources with high-confidence associations, supported by Monte Carlo tests indicating at least 95% are genuine.
• Radio source positions are accurate to within ~1 arcsec, enabling precise cross-matching.
• Covers a significant 6.0 steradians of the southern sky, excluding regions near the Galactic plane.
• Reveals a quantifiable detection rate trend, from near 100% for the brightest radio sources down to ~1% at 100 mJy.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-03-13 19:09:25.852861; freshness should be verified.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC)

Collection Method

Cross-match of the AT20G radio catalog with the Fermi-LAT 1FGL gamma-ray catalog.

Time Range

Based on the Fermi 1-year Point Source Catalog (1FGL) and AT20G survey (2010).

Freshness

Last updated 2026-03-13 19:09:25.852861

Geography

Southern sky with Declination < 0 degrees and Galactic latitude |b| > 1.5 degrees.