What is the primary beam response of an interferometer with unequal elements?

Details What is the primary beam response of an interferometer with unequal elements? What is the primary beam response of an interferometer with unequal elements?

2004-12-30

arxiv.org/abs/astro-ph/0412687v1

Astronomy and Astrophysics

Astrophysics

2 pages. no figures. Proceedings of the 7th European VLBI Network Symposium held in Toledo, Spain on October 12-15, 2004. Edit

Scientific paper

The EVN stations encompass elements with a range of diameters, even including an interferometer (the Westerbork Telescope, with up to 14 elements used together as a tied array). In combination, the various station pairs will each produce their own primary beam envelopes, with which the interferometer pattern is modulated. People sometimes forget that in the case of unequal elements, this combined primary beam envelope is different from the beam of each element separately. The reason for this is reviewed, the results for a number of station pairs are summarized, and some of the practical consequences are discussed. The increased interest in wide-field applications, as illustrated by several recent results, underlines the need for a proper determination of the interferometer beam envelope.

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