GMRT Lockman Hole 610-MHz Radio Source Catalog 2: 4,934 Sources

4,934 radio sources detected in the Lockman Hole field using the Giant Metrewave Radio Telescope at 610 MHz. The catalog combines earlier observations of a central ~5 square degree area with new observations covering a further ~8 square degrees, for a total of ~14 square degrees. The table was created by NASA's HEASARC in February 2012 based on data from CDS Catalog J/BASI/38/103.

Use Cases

• Cross-matching radio sources with optical or infrared catalogs based on the precise positional data.
• Analyzing source density and distribution across a ~14 square degree field to study large-scale structure.
• Studying the properties of faint radio sources based on the low rms noise level of ~80 microJansky/beam.
• Investigating the impact of bright sources like 3C244.1 on local noise characteristics in radio maps.

Strengths

• Catalog contains 4,934 distinct radio sources.
• Covers a total area of approximately 14 square degrees, expanding on a previous ~5 square degree survey.
• Achieves a low rms noise level of approximately 80 microJansky/beam for most pointings.
• Provides high angular resolution of 6 x 5 arcseconds, matching the earlier survey.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is known, but specific column names and data types are not provided in the metadata.
• Noise levels are noted to be worse in the western region near the bright source 3C244.1.

Provenance

Source

NASA HEASARC, based on CDS Catalog J/BASI/38/103.

Collection Method

Observations made with the Giant Metrewave Radio Telescope at 610 MHz.

Freshness

Last updated 2026-03-13 17:16:56.340046; freshness should be verified.

Geography

Observations of the Lockman Hole field.