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2nd of August 2021
Gold, Silver, Bronze!
by Pennock et al.
With the Tokyo Olympic Games in full swing, it is fitting to revisit the recent paper of Pennock et al. which presented an analysis of a new ASKAP radio continuum image of the Large Magellanic Cloud (LMC) at 888 MHz. They produced a catalogue of 54,612 sources, divided over a Gold list (30,866 sources) complete down to 0.5 mJy, a Silver list (22,080 sources) of fainter sources, and a Bronze list (1,666 sources) of visually inspected sources in areas of high noise and/or near bright complex emission. While the source lists are dominated by extragalactic sources seen behind the LMC, the detections include planetary nebulae, young stellar objects, HII regions, supernova remnants, bubbles, novae and X-ray binaries in the LMC. The image above shows density plots of the Gold (left), Silver (centre) and Bronze source lists (right). These show that the Gold source list is uniform across the LMC field, except in the area of very bright 30 Doradus, which is seen as a blank space. The Silver source list is not as uniform and showcases gaps where the brighter LMC sources are present. The Bronze source list covers the edges of the LMC field and the areas of the brightest sources, where the local image noise level is greatest.

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