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The
ASKAP
update for August reports on
maintenance activities, efforts to improve pipeline performance and image quality,
and some of the interesting features found during data validation efforts.
Data validation has been revealing many interesting features in
full survey data products, ranging from new perspectives on known
sources to unexplained instrumental effects.
A recent EMU/POSSUM field contained one source with more pronounced
imaging artefacts than any other. This turned out to be the bright
millisecond pulsar J0437-4715, which scintillates on the time and
frequency scales sampled by ASKAP and therefore appears as a strongly
variable source with associated calibration artefacts.
The image above shows the dynamic spectrum of PSR J0437-4715 from the
10-hr EMU observation spanning 800 to 1087 MHz, showing structure in
both time and frequency.
The x-axis is time in 10-second (ASKAP integration cycle) steps.
(Image credit: Emil Lenc)
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