The largest sampled spatial frequency is directly linked to the synthesized
beam size (i.e. the interferometer spatial resolution). The pixel size must
be at least 1/2 the synthesized beam size to ensure Nyquist sampling in the
image plane. However, Nyquist sampling is enough only when dealing with
linear processes while deconvolution techniques are non-linear. It
is thus recommended to select a pixel size between 1/3 and 1/4 of the synthesized
beam to ease the deconvolution. Smaller pixel sizes would lead
to larger images, and unduly slow down the imaging and deconvolution process.
Gildas manager
2023-06-01