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ALMA Memo #368
An Imaging Study for ACA

Min Yun
May 2001

The ALMA Complementary Array (ACA) is one of the several new capabilities for ALMA enabled by the Japanese participation to the Project. It is conceived to be a small independent array of 6-8m diameter antennas to complement the imaging capability of the primary array of 12m diameter antennas. Its main objective is measuring the short spacing data poorly sampled by the 12m antennas. It should also be able to produce good scientific images by itself, enabling an independent, parallel observing mode, especially at higher frequencies.

There are many aspects to evaluating whether an array of 6m antennas or 8m antennas are better suited for complementing the imaging capability of the 12m antenna array (e.g. cost, calibration, seeing). In this memo, we present a set of simulated observations aimed at addressing only the uv-sampling aspects and the impact on the image construction process. The only source of ``error'' in this study is the sampling of the uv cells and its interaction with the imaging algorithms. The issues related to the imaging algorithms are found to be a non-trivial matter.

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Last modified: May 07, 2001

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