When the spatial dynamic of the imaged source is large (i.e. when the ratio
of the largest source structure over the synthesized resolution is large),
the basic CLEAN algorithms may (rarely) turn smooth area of the source
into a serie of ridges and stripes. Indeed, when the dirty beam pattern is
subtracted from a smooth feature of the dirty map, the sidelobes patterns
appear in the residual map. The search for the next clean component will
then pick first the pixels in the sidelobes pattern amplifying this
pattern. Several variants of CLEAN have been devised to solve this
problem.
Subsections
Gildas manager
2023-06-01