TGSS ADR: 0.62 Million Radio Sources from 150-MHz All-Sky Survey

0.62 million radio sources were cataloged from the TIFR GMRT Sky Survey (TGSS) covering 90% of the sky. The Giant Metrewave Radio Telescope (GMRT) collected over 2000 hours of observations between April 2010 and March 2012. The HEASARC created this table in February 2017 based on data from the TGSS Alternative Data Release project.

Use Cases

• Cross-matching radio sources with optical or infrared catalogs based on the provided astrometric coordinates.
• Studying the statistical properties of low-frequency radio source populations based on the flux density measurements.
• Calibrating and validating observations from new low-frequency aperture array telescopes based on the survey's reference data.
• Characterizing foreground contamination for epoch-of-reionization (EoR) studies based on the all-sky 150-MHz maps.
• Investigating source variability or performing follow-up observations using the mosaic images and cutout service.

Strengths

• Covers 36,900 square degrees (90% of the sky) between -53 and +90 degrees Declination.
• Catalog contains 0.62 million sources with flux densities from 11.1 mJy to 9.22 kJy.
• Median RMS background noise is 3.5 mJy per beam, with astrometric accuracy better than 2 arcseconds.
• Good quality images were produced for over 95% of the 5,336 pointings.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The flux density accuracy is estimated at approximately 10%, which may affect precision analyses.

Provenance

Source

National Aeronautics and Space Administration (NASA) HEASARC, based on CDS Catalog J/A+A/598/A78.

Collection Method

Automated data-reduction pipeline processing over 2000 hours of GMRT telescope observations.

Time Range

Observations taken between April 2010 and March 2012.

Freshness

Last updated 2026-03-13 17:25:32.979133; freshness should be verified.

Geography

All-sky survey covering -53 to +90 degrees Declination.