[asac] [almanews] ALMA Memo No. 368 Released

[Carolyn White]

ALMA Memo No. 368

An Imaging Study for ACA

Min S. Yun

05/04/01

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.

View a pdf version of ALMA Memo 368 at URL:
     http://www.alma.nrao.edu/memos/html-memos/alma368/memo368.pdf

View a html version of ALMA Memo 368 at URL:
          http://www.alma.nrao.edu/memos/html-memos/alma368/memo368.html




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