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30th of July 2020
ASKAP and MWA imaging of radio galaxies
by Hodgson et al.
Hodgson et al. have used the MWA and ASKAP to follow up 28 candidate large-scale diffuse synchrotron sources previously reported as possible detections of filaments of the synchrotron cosmic web. They show that lower frequency observations, and in particular those by ASKAP, are ideally suited to detect large-scale, extended synchrotron emission (but conclude that none of the 28 sources are likely to be associated with the cosmic web). As a demonstration of the capabilities of ASKAP and the MWA, Hodgson et al. present the above image of a radio galaxy in the same field. The colour-scale image is from ASKAP data centred at 887 MHz, with the white contours from the MWA (phase 2 array) centred at 154 MHz. In contrast to the example in an ADAP earlier this week, the two radio lobes of the galaxy are detected by both telescopes, with the radio core not detected by either telescope. The peaks of the MWA emission are offset from the ASKAP peaks due to differences in spectral indices of the bright hotspots visible in the ASKAP image and the jet and lobe emission closer to the core, and the angular resolutions of the two telescopes. The paper will be published in Publications of the Astronomical Society of Australia.

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