Only five of these bizarre space circles have ever been sighted, and now scientists have captured one in spectacular detail.
The odd radio circle’s large outer circle is possibly more than a million light years across. Credit: J. English /EMU/MeerKAT/DES
The image of ORC J2103-6200, also called ORC1, was captured by the high-resolution MeerKAT radio telescope in South Africa, which has given researchers unprecedented information about these rare phenomena. Details are reported in a preprint, posted on the arXiv“This discovery will start new scientific research among astronomers,” says Alice Pasetto, a radio astronomer at the National Autonomous University of Mexico in Mexico City.
The first three ORCs, including ORC1, were discovered using the Australian Square Kilometre Array Pathfinder telescope in 2019. A fourth was identified in archival data from India’s Giant MetreWave Radio Telescope in 2013, and a fifth was discovered by Koribalski in newer ASKAP data last year. Most of the ORCs have a galaxy at their centre, which astronomers suggest might have something to do with their creation.
The ORCs detected so far have mostly been found using ASKAP, because of its huge field of view. Radio telescopes are generally able to view an area the size of the Moon, whereas ASKAP can scan areas 100 times bigger. Once ASKAP had spotted ORC1, MeerKAT was used to examine it in more detail because its higher resolution provides a much sharper radio image.
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