Astronomers have uncovered a surprising rule that appears to determine when black holes unleash powerful jets of material into space. Even though black holes can differ in mass by millions of times, researchers found that they seem to follow the same fundamental pattern when producing these enormous cosmic outflows. The discovery, published in Nature Astronomy, suggests that black holes can activate their jets at the same critical stage of their feeding cycle, whether they weigh roughly 10 times as much as the Sun or millions of times more.
The research was led by Dr. Adelle Goodwin, an astrophysicist at Curtin University's International Centre of Radio Astronomy Research (ICRAR) and a Forrest Research Foundation Fellow, alongside co-author Dr. Andrew Mummery of the Institute for Advanced Study in Princeton.
The breakthrough emerged from years of studying unusual events in which supermassive black holes tear stars apart. By combining observations from telescopes in Australia, the United States, India, South Africa, and space, the scientists pieced together a clearer picture of how black holes behave as they consume matter. Surprisingly, the crucial insight did not come while examining a telescope.
It happened in a bar in Madrid, where Goodwin and Mummery were attending a scientific conference. During a conversation, they recognized that the same rule known to govern jet formation in relatively small black holes also seemed to apply to their supermassive counterparts. Why Some Black Holes Erupt Years After Devouring Stars One of the biggest mysteries the researchers wanted to explain was why black holes do not always launch jets at the same time.
When a supermassive black hole tears apart a star, it sometimes produces a powerful jet almost immediately. In other cases, the black hole appears relatively quiet for months or even years before suddenly producing a detectable radio outflow. "We were looking at these events and asking why the timing was so different," said Dr.
"Then the pattern became clear. The delayed jets were appearing when the black hole's feeding rate dropped to the same critical point already known from much smaller black holes. "That was the moment we realized this was not just a quirk of one type of black hole, but it looked like a rule that applied across the Universe." Although black holes are often portrayed as cosmic vacuum cleaners that swallow anything nearby, their feeding behavior is far more complicated.
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