Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..12e..51m&link_type=abstract
Long Wavelength Astrophysics, 26th meeting of the IAU, Joint Discussion 12, 21 August 2006, Prague, Czech Republic, JD12, #51
Astronomy and Astrophysics
Astrophysics
Scientific paper
It is not trivial to produce high-SNR images from radio interferometer data. In very deep integrations at low frequencies, strong radio sources well outside the primary beams cause sidelobes in the synthesized image, and limit its dynamic range. These sidelobes cannot be removed with cleaning and self-calibration techniques, and it becomes necessary to predict the effects of strong sources and to remove them from the data before an image is formed. We present results from recent holographic measurements of a subset of the antennae of the Australia Telescope Compact Array (ATCA) at 1.4 GHz. We have mapped in detail the far-field reception pattern of ATCA antennae to sources as far as 20 degrees away from the optical axis, using beacons of a geostationary satellite. We report the results from these observations and the improvements they yield for wide-field, deep radio interferometer observations. Future sensitive, low-frequency radio interferometers such as the xNTD and the SKA will need similar calibration techniques to reach their full potential.
Cornwell Tim
Graves Genevieve
Kesteven Michael
Middelberg Enno
Voronkov Maxim
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