Radio Continuum Surveys

Systematic surveys that map large areas of the sky with high sensitivity in a uniform manner are a major program at most observatories. Such surveys are expected to detect objects over a wide range of distances, from objects in the Milky Way to objects at cosmological distances. The TIFR-GMRT Sky Survey (TGSS) is an all-sky GMRT radio continuum survey at 150 MHz, covering about 37,000 square degrees of the sky north of declination -55 degrees, at an angular resolution of about 20”. The TGSS is more than 4 times better in both sensitivity and angular resolution than existing surveys at this frequency. When complete, the survey is expected to detect more than 2 million sources and to serve as a major database for multi-wavelength astronomy, yielding many new and interesting discoveries.