Australia Telescope 2FGL Catalog: Radio Sources Near Unassociated Gamma-Ray Objects

A catalog of 424 radio sources detected near 283 unassociated gamma-ray sources from the Fermi 2FGL Catalog. The data includes positions, flux density estimates at 5 and 9 GHz, and spectral indices for 146 sources, created by NASA HEASARC in July 2013. Observations were conducted with the Australia Telescope Compact Array targeting fields of 411 gamma-ray sources with declinations less than +10 degrees.

Use Cases

• Cross-matching radio sources with gamma-ray error ellipses based on reported positional data.
• Analyzing radio spectral properties based on flux densities at 5 and 9 GHz.
• Identifying candidate counterparts for unassociated Fermi gamma-ray sources based on association probability metrics.
• Studying the population of faint radio sources below 100 mJy not found in previous surveys.

Strengths

• Contains 424 radio source detections, with 146 objects having measurements in both 5- and 9-GHz bands.
• Includes 84 sources with spectral indices flatter than -0.5, which may indicate specific astrophysical processes.
• Focuses on previously unassociated gamma-ray sources, providing new candidate identifications.

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 16:45:08.261213; freshness should be verified.

Provenance

Source

NASA HEASARC, based on tables from a reference paper in MNRAS.

Collection Method

Observations with the Australia Telescope Compact Array at 5 and 9 GHz.

Geography

Covers gamma-ray sources with declinations less than +10 degrees.