VLA M 31 1.4-GHz Source Catalog: 916 Radio Sources in Andromeda

Data Release 2 of a point source catalog identifies 916 unique discrete radio sources in the Andromeda galaxy (M 31) from 28 archived VLA observations at 1.4 GHz. The catalog contains 1,131 detections, with spectral indices derived for 98 sources by cross-referencing with a 325 MHz catalog. This table was created by NASA's HEASARC in May 2015 based on data from CDS Catalog J/Other/Ser/189.15.

Use Cases

• Identify and catalog discrete radio sources in M 31 based on integrated flux densities at 1.4 GHz.
• Analyze spectral indices to determine if source emission is thermal or non-thermal based on cross-referenced 325 MHz data.
• Study source variability and reliability by examining the 109 sources detected in at least two separate VLA images.
• Compare radio source populations and characteristics between different wavelengths (20 cm and 92 cm).

Strengths

• Contains 1,131 detections of 916 unique radio sources, providing a substantial catalog for analysis.
• Includes derived spectral indices for 98 sources, enabling analysis of emission mechanisms.
• 109 sources were detected in multiple observations, which may help assess source reliability.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific analytical needs.

Provenance

Source

NASA HEASARC, based on CDS Catalog J/Other/Ser/189.15.

Collection Method

Created from a series of previously constructed radio-continuum images from archived VLA observations.

Freshness

Last updated 2026-03-13 17:03:34.410882; freshness should be verified.

Geography

Andromeda Galaxy (M 31).