In 2019, my colleagues and I discovered spooky glowing rings in the sky using CSIRO's ASKAP radio telescope in Western Australia. The rings were unlike anything seen before, and we had no idea what they were.
We dubbed them odd radio circles, or ORCs. They continue to puzzle us, but new data from South Africa'sWe can now see each ORC is centered on a galaxy too faint to be detected earlier. The circles are most likely enormous explosions of hot gas, about a million light years across, emanating from the central galaxy.
They look like rings instead of orbs only because the sphere appears brighter at the edges where there is more material along the line of sight, much like a soap bubble. This suggests that an explosion in the central galaxy caused a hot blast to collide with the tenuous gas outside the galaxy. The resulting shock wave then energized electrons in the gas, making them spiral around the magnetic field, generating radio waves.
One big surprise from the MeerKAT result is that within the ring we see several curved filaments of radio emission. We still don't know what these are.
France Dernières Nouvelles, France Actualités
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