Mysterious radio waves a million light years across, known as “odd radio circles”, have been definitively spotted 5 times, and each of them has a supermassive black hole at its centre.
, with several more unconfirmed candidates. Now Norris and his colleagues have used the MeerKAT telescope in South Africa to take the sharpest image yet of an ORC..
Of the five confirmed ORCs, astronomers had seen galaxies at the centres of three of them, which hinted that the circles might be formed by some galactic process.The new observations from MeerKAT have revealed that all ORCs seem to have central galaxies containing active supermassive black holes. That significantly narrows down the options for what ORCs could be.
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