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17th of August 2023
ASKAP Update for August
by Aidan Hotan
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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