A supermassive black hole just finished a 100-million-year nap

Space · Published 21 October 2026 Swipe more like this →

In short: Deep in space, a celestial engine has roared back to life after an epoch of silence. Astronomers have captured the first vivid portraits of this "reborn" activity, revealing a cosmic volcano that carves out structures nearly one million light-years across the void.

The galaxy J1007+3540 serves as a rare laboratory for observing episodic AGN—galaxies where the central supermassive black hole switches on and off over cosmic timescales. While most galaxies host such black holes, only a small fraction produce the massive jets of magnetized plasma that emit radio waves. In this specific instance, researchers identified a compact, bright inner jet signaling a recent awakening after nearly 100 million years of inactivity.

The discovery provides clear evidence of multiple eruptions. Data gathered from India's upgraded Giant Metrewave Radio Telescope (uGMRT) and the Netherlands' Low Frequency Array (LOFAR) allowed researchers to see distinct layers: current outward-moving jets are surrounded by a shell of ancient, dim plasma. This leftover debris represents previous eruptions that have been distorted and squeezed by the hostile environment surrounding the galaxy.

What makes J1007+3540 particularly spectacular is its interaction with a massive galaxy cluster. The newly reactivated jets are currently locked in a chaotic struggle, being bent and compressed by the intense pressure of the surrounding hot gas. This interaction creates a distorted structure stretching nearly one million light-years across space, providing a unique look at how galactic engines compete with the crushing forces of their environments.

The study, led by Shobha Kumari of Midnapore City College along with researchers from India and Poland, was published in Monthly Notices of the Royal Astronomical Society. It highlights the episodic nature of these giants, proving that black holes are not always constant emitters but can remain dormant for millions of years before erupting once again.

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