Dying radio galaxies reveal a shorter, more dynamic afterlife of black hole jets
Peer-Reviewed Publication
Updates every hour. Last Updated: 21-Oct-2026 13:16 ET (21-Oct-2026 17:16 GMT/UTC)
Astronomers have uncovered evidence that the fading phase of some radio galaxies may be considerably shorter and more dynamic than previously recognised. Led by researchers at the University of Cape Town and the Inter-University Institute for Data Intensive Astronomy (IDIA), the study examined 14 candidate remnant radio galaxies in the XMM–LSS deep field using sensitive observations spanning 144 MHz to 1.5 GHz.
Detailed spectral modelling confirmed 12 of the 14 sources as genuine remnant radio galaxies and revealed comparatively young spectral ages of approximately 8–42 million years. Many of the sources are faint and lie at relatively high redshifts, representing a population that has been difficult to detect in previous radio surveys. The findings suggest that radio lobes can fade rapidly after the supermassive black hole at the centre of a galaxy stops powering its jets, providing an important preview of the populations that will be discovered by future Square Kilometre Array (SKA) surveys.
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