After nearly a century of silence, a supermassive black hole in the galaxy J1007+3540 has dramatically reignited, emitting powerful radio waves and offering astronomers a rare chance to study these enigmatic cosmic engines. The event, detected by the Low-Frequency Array (LOFAR) in the Netherlands, showcases the cyclical nature of active galactic nuclei (AGN) – galaxies with supercharged central black holes. Findings published January 15th detail how this “cosmic volcano,” as described by researchers, is interacting with surrounding gas and plasma, potentially unlocking new understanding of galaxy evolution [[2]].
After nearly 100 million years of dormancy, a supermassive black hole has sprung back to life, emitting a powerful burst of radio waves detected from the center of a distant galaxy. This remarkable event offers scientists a rare glimpse into the cyclical behavior of these cosmic giants and the dynamic environments surrounding them. Understanding these processes is crucial for unraveling the evolution of galaxies and the universe.
Researchers have discovered that before its long period of inactivity, the black hole unleashed massive plumes of plasma extending hundreds of thousands of light-years into space. Now, these plumes are reactivating and interacting with the extremely hot gas in the surrounding region.
“It’s like watching a cosmic volcano erupt again after a very long period of quiet,” said Shobha Kumari, an astronomer at Midnapore City College in India, in a report from Live Science on January 21, 2026. “Only this one is large enough to form structures stretching almost a million light-years across space.”
Only 10–20 percent of supermassive black holes are known to produce these jets of radio-emitting particles. These jets form when material from the disk of dust and plasma around the black hole creates a strong magnetic field that ejects matter into space. Changes within this disk can cause the radio emissions to cease and then resume.
The findings, published January 15 in the journal Monthly Notices of the Royal Astronomical Society, are based on observations from the Low-Frequency Array (LOFAR), a network of radio telescopes located in the Netherlands. Researchers identified over 20 galaxy clusters containing radio galaxies with irregular emissions, with galaxy J1007+3540 exhibiting the most striking activity.
Galaxy J1007+3540 features large plasma lobes indicating past activity around 240 million years ago. Within these lobes, scientists found smaller, brighter plasma emissions approximately 140 million years old, suggesting the galaxy’s central engine, known as an active galactic nucleus (AGN), briefly reignited after a period of dormancy.
“The dramatic layering of young jets within the old lobes that have run out of energy is a hallmark of episodic AGN—a galaxy whose central engine turns on and off over cosmic timescales,” Kumari explained.
The jets are also influenced by the intracluster medium, the superheated gas that fills the space between galaxies within the cluster. This gas bends and compresses the jet structures, resulting in different shapes in each plasma lobe.
“J1007+3540 is one of the clearest and most spectacular examples of an episodic AGN with jet-cluster interaction, where the surrounding hot gas bends, compresses, and distorts the jets,” said Surajit Pal, a physicist at Manipal Centre for Natural Sciences in India.
Researchers believe that studying J1007+3540 will help determine how frequently AGNs cycle between active and inactive phases, and how older jets interact with their environment. The team plans to conduct high-resolution observations to map the propagation of the jets through the intracluster medium. These observations could provide valuable insights into the lifecycle of black holes and their impact on galaxy evolution.
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