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5th of September 2019
ASKAP EMU Pilot Survey underway
by Aidan Hotan
The ASKAP pilot survey program was designed to test strategies that have been developed by ASKAP's science teams and determine the telescope's readiness for full-scale surveys. Each survey team has been allocated 100 hours of observing time to test its own specific strategy. The first EMU pilot survey field has already been imaged and quality control checks are now underway by the EMU team. The noise floor in the EMU pilot images is roughly 25 micro-janksy per beam. Some current issues with the reliability of beam weight updates and correlator data streaming mean that typically 3 antennas and up to 20% of the bandwidth may be flagged, so sensitivity limits should improve as these issues are resolved. Initial processing of EMU's pilot survey will provide Stokes I and V multi-frequency synthesis images as well as a 1-MHz Stokes I (total intensity) cube for comparison. To determine whether POSSUM can operate commensally with EMU, Stokes Q and U cubes will also be produced once a viable method of leakage calibration has been developed. The image above is a small cut-out from the first of 10 fields in the EMU pilot survey. More details are available from the latest ASKAP Commissioning Update.

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