The Cotton-Schwab Clean At Ultra-High Dynamic Range

Details The Cotton-Schwab Clean At Ultra-High Dynamic Range The Cotton-Schwab Clean At Ultra-High Dynamic Range

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004exa....18...13v&link_type=abstract

Experimental Astronomy, Volume 18, Issue 1-3, pp. 13-29

Astronomy and Astrophysics

Astronomy

5

Techniques: Interferometric, Techniques: Image Processing, Methods: Numerical

Scientific paper

We present a study of the dynamic range limitations in images produced with the proposed Square Kilometre Array (SKA) using the Cotton-Schwab CLEAN algorithm for data processing. The study is limited to the case of a small field of view and a snap-shot observation. A new modification of the Cotton-Schwab algorithm involving optimization of the position of clean components is suggested. This algorithm can reach a dynamic range as high as 106 even if the point source lies between image grid points, in contrast to about 103 for existing CLEAN-based algorithms in the same circumstances. It is shown that the positional accuracy of clean components, floating point precision and the w-term are extremely important at high dynamic range. The influence of these factors can be reduced if the variance of the gradient of the point spread function is minimized during the array design.

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