Astronomers using NASA’s Hubble Space Telescope have made a groundbreaking discovery: they’ve found a wandering supermassive black hole, AT2024tvd, tearing apart a star about 600 million light-years away. This black hole isn’t located in the center of its galaxy, which goes against what scientists typically thought about these giants. Their findings, detailed by both NASA and researchers from UC Berkeley, could reshape how we search for black holes, especially those that aren’t found at the heart of galaxies.
The discovery came from combining data from several telescopes, including the Zwicky Transient Facility and Hubble. This black hole is positioned about 2,600 light-years from its galaxy’s core, where a much larger black hole, about 100 million times the mass of the Sun, resides. This is the first time an event like this has been seen so far from a galaxy’s center, marking a new chapter in our understanding of rogue black holes.
Tidal disruption events (TDEs) are rare occurrences where a star strays too close to a black hole and gets torn apart by its powerful gravity, often described as “spaghettification.” This process stretches the star into a thin shape, and leads to a burst of light detectable across various wavelengths, from X-rays to radio waves.
What makes this discovery special is that astronomers have observed such an event from a black hole far from the center of its galaxy for the first time. Lead study author Yuhan Yao from UC Berkeley believes this opens the door for finding more wandering black holes in other galaxies. “This could drive scientists to look for more instances of this kind of event,” Yao shared.
Despite astronomers often finding multiple black holes in a galaxy—especially during cosmic collisions—the existence of one far from its galactic center is intriguing. The presence of these wandering black holes has been a topic of speculation. However, until now, evidence was sparse. This finding provides a significant boost to the quest for rogue black holes and equips researchers with new methods to track them down.
“This is groundbreaking,” said Ryan Chornock, an astrophysicist at UC Berkeley. “The existence of wandering supermassive black holes was predicted, but now we can use TDEs to search for them more effectively.”
So, why is this black hole where it is? One possible explanation is that it was ejected from the galaxy’s core during a chaotic period involving multiple black holes. Another theory is that it could be the remnant of a smaller galaxy that fused with the larger one over a billion years ago.
If this black hole is indeed from a merger, it might eventually drift back to the galaxy’s center and collide with the larger black hole there. This could send out gravitational waves—ripples in spacetime detectable by future observatories like the Laser Interferometer Space Antenna (LISA), set to launch in 2035.
The discovery of AT2024tvd is just a starting point for exploring rogue supermassive black holes. As astronomers conduct more sky surveys, they may uncover numerous examples of these elusive giants, leading to a deeper understanding of our dynamic universe.
Yuhan Yao emphasizes the significance of this event: “This discovery might drive scientists to seek more examples of such occurrences.” As technology improves and new observatories come online, we may just be beginning to uncover hidden black holes lurking across the cosmos.
For more extensive information, you can check NASA’s detailed report on this discovery here.