Rapid mapping of the sky at 240MHz using the antennas of the Giant Metrewave Radio Telescope

Details Rapid mapping of the sky at 240MHz using the antennas of the Giant Metrewave Radio Telescope Rapid mapping of the sky at 240MHz using the antennas of the Giant Metrewave Radio Telescope

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.398..853s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 398, Issue 2, pp. 853-861.

Astronomy and Astrophysics

Astronomy

2

Instrumentation: Miscellaneous, Methods: Observational, Surveys, Galaxy: Structure, Radio Continuum: Galaxies

Scientific paper

In this paper we describe a method for measuring the effective receiver temperature Terc and its variation for the entire receiver chain of a radio telescope, and use it to make a radio-continuum map of the sky at 240MHz using the Giant Metrewave Radio Telescope (GMRT). We also show that in the case of GMRT, Terc varies mainly with elevation and ambient temperature. The calibration techniques evolved here are applicable to similar interferometers with a large number of antennas, several frequency bands and a number of receiver systems at room temperature (where conventional methods are time-consuming). This method ideally requires just one complete day of observations in a frequency band.

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