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5th of August 2021
Dancing Ghosts
by Norris et al.
The EMU (Evolutionary Map of the Universe) ASKAP Survey Science Project is publishing a paper describing the results from the EMU Pilot Survey. In an article for The Conversation, Ray Norris describes some of the surprises that have emerged from this data set: "Scanning through data fresh off the telescope, we saw two ghosts dancing deep in the cosmos. We had never seen anything like it before, and we had no idea what they were. Several weeks later, we had figured out we were seeing two radio galaxies, about a billion light years away. In the centre of each one is a supermassive black hole, squirting out jets of electrons that are bent into grotesque shapes by an intergalactic wind. The two galaxies we think are responsible for the streams of electrons (shown as curved arrows) that form the Dancing Ghosts. But we don’t understand what is causing the filament labelled as 3. But where does the intergalactic wind come from? Why is it so tangled? And what is causing the streams of radio emission? We still don’t understand the details of what is going on here, and it will probably take many more observations and modelling before we do." (Image credit: Jayanne English and Ray Norris using data from EMU and the Dark Energy Survey)

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