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The
ASKAP
update for October reports
on survey progress, ingest cluster maintenance and several new science data processing software features.
ASKAP's feature is its wide field-of-view enabled by its Phased Array Feeds.
The existing w-projection scheme that ASKAPsoft uses to correct for
wide-field imaging artefacts runs as a serial process,
which limits the oversampling and support parameters that
can be used on Setonix.
Standard continuum processing (such as for EMU) has used the
best set of parameters that would reliably fit on Setonix, but these
are still sub-optimal in certain situations.
The image above shows a region extracted from a recent EMU observation
scaled to show the presence of curved wide-field artefacts around a
bright source. These persist due to insufficient w-term correction.
An alternative w-projection scheme that shares
common resources over multiple threads is now being tested.
This should reduce resource
requirements for the current set of w-projection parameters and
provide room to improve the widefield correction without exceeding
system resources.
(Image credit: Emil Lenc)
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