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28th 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. The bright radio lobes of the galaxy are detected by both telescopes, but the radio core (the isolated feature midway between the lobes) is only visible in the higher frequency ASKAP image; this is typical of galactic core emission which tends to have have a flatter spectrum at low radio frequencies. The paper will be published in Publications of the Astronomical Society of Australia.

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