Fermi 2FGL: Radio Survey of Unassociated Gamma-Ray Sources

Observations from 2012-2013 with the VLA and ATCA radio telescopes surveyed sky areas around unassociated gamma-ray sources from the Fermi LAT Second Source Catalog. The survey identified 865 candidate radio sources and provided firm associations for 76 previously unknown gamma-ray active galactic nuclei (AGNs). This HEASARC table contains results from the survey, including follow-up observations with the VLBA and LBA.

Use Cases

• Cross-match gamma-ray and radio source catalogs based on arcminute-scale localizations.
• Calculate association probabilities for candidate sources based on background source statistics.
• Identify 'empty' gamma-ray fields with no detected radio continuum sources above the sensitivity limit.
• Compare new AGN associations with predictions from WISE color-color diagrams.
• Study the nature of Galactic gamma-ray emitters concentrated at low Galactic latitudes.

Strengths

• Survey covers 216 target fields observed with the VLA and 411 sources observed with the ATCA.
• Provides firm associations for 76 previously unknown gamma-ray AGNs.
• Includes follow-up observations at milliarcsecond resolution for 170 selected sources, detecting 95.
• Quantifies association probabilities using known statistics of source counts.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Observations from the Very Large Array (VLA), Australia Telescope Compact Array (ATCA), Very Long Baseline Array (VLBA), and Long Baseline Array (LBA).

Time Range

2012-2013

Freshness

Last updated 2026-03-13 18:51:59.754301; freshness should be verified.

Geography

All-sky survey, with specific Declination ranges for different telescope campaigns.