Hubble Discovers a Wandering Black Hole Light-Years Away from Its Origin

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A black hole lurking 600 million light-years away in space revealed itself with a spectacular flash—the light from a star it had just consumed. Using NASA’s Hubble Space Telescope and other observatories, astronomers discovered this cosmic object in an unexpected location. Instead of being at the center of its galaxy like most supermassive black holes, this one is situated thousands of light-years away from the core—specifically, 2,600 light-years distant. Interestingly, there is another massive black hole that serves as the actual nucleus. The wandering black hole has a mass equivalent to 1 million suns, while the central black hole has a mass 100 million times that of the sun.

The burst of radiation detected, known as a tidal disruption event (TDE), began when a star ventured too close to the black hole. Without that stellar interaction, this black hole would likely have gone unnoticed by astronomers. “It opens up the entire possibility of uncovering this elusive population of wandering black holes with future sky surveys,” said study author Yuhan Yao from UC Berkeley. “I believe this discovery will encourage scientists to search for more instances of this type of event.”

Observations Confirm the Discovery

The Hubble Space Telescope, a collaborative effort between NASA and the European Space Agency, has confirmed the presence of this wandering supermassive black hole, located 600 million light-years from Earth.

Out of about 100 TDE events identified through surveys to date, this one, designated AT2024tvd, is the first witnessed emerging from a supermassive black hole that is not located at a galactic nucleus. The findings by the research team will be published in a forthcoming issue of The Astrophysical Journal Letters. Black holes are among the most enigmatic phenomena in outer space. Approximately 50 years ago, they were mostly theoretical—a quirky solution to a physics conundrum. Even leading astronomers were not entirely convinced of their existence. Today, black holes are recognized as scientific reality, with images captured by a network of large, synchronized radio dishes on Earth.

Unlike a planet or star, black holes lack surfaces. Instead, they have a boundary known as an “event horizon,” or a point of no return. Anything that ventures too close, including the unfortunate star, will fall in, becoming trapped by the black hole’s gravitational grip. The most common type, called a stellar black hole, is believed to form from the collapse of a massive star following a supernova explosion. The material from the star condenses into a relatively small area. The origins of supermassive black holes remain even more mysterious. Astrophysicists suggest these unseen giants dwell in the cores of nearly all galaxies, with recent Hubble observations supporting the theory that they may originate in the dense cores of starburst galaxies, where new stars rapidly form.

A Stellar Event Unfolds

As the star was stretched and torn apart during the TDE, some of its gas created a glowing ring around the black hole. This resulted in a flare that shone brightly in ultraviolet and visible light. Ground-based telescopes, such as the Zwicky Transient Facility in California, were the first to detect this phenomenon, but it was Hubble that confirmed the flare’s off-center position. Supporting data was provided by NASA’s Chandra X-ray Observatory and the Very Large Array in New Mexico. The two supermassive black holes exist within the same galaxy, yet they do not form a gravitationally bound binary pair. The mechanism by which the wandering black hole arrived in its current location remains unknown.

One possibility is that the smaller black hole originated from a smaller galaxy that merged with the larger one, bringing its core black hole along. Eventually, the smaller black hole may spiral into the larger one, but for now, it remains on its own trajectory. An alternative explanation suggests it may have been influenced by other nearby black holes. In interactions involving three bodies, the lighter object can be expelled from the galaxy’s center, with the other two remaining central. “Theorists have predicted that a population of massive black holes located away from the centers of galaxies must exist,” said Ryan Chornock, a team member from ZTF. “Now, we can use TDEs to identify them.”

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