Supermassive Black Hole Discovered Far From Galaxy Center
Astronomers discovered a supermassive black hole 3,500 light-years from its galaxy's center after it tore apart a passing star. The rare tidal disruption event sheds light on hidden black holes.
Unexpected Discovery of a Supermassive Black Hole
A massive black hole capable of tearing stars apart has been discovered far from the center of a large galaxy, defying standard astronomical expectations. Reported by Phys.org, the unusual finding was revealed following a powerful light outburst triggered when a star ventured too close to the black hole and was shredded by its intense gravitational forces.
The event, designated TDE 2023mfm, was first identified using the Zwicky Transient Facility telescope array. A research team led by Dr. Itay Safardi from the University of California analyzed the phenomenon using multiple instruments, including the Hubble Space Telescope, the W.M. Keck Observatory, and the Karl G. Jansky Very Large Array (VLA).
Unusual Location and Tidal Disruption
What particularly surprised scientists was the location of the black hole: approximately 3,500 light-years from the center of its host galaxy. Typically, black holes of this scale reside firmly at galactic centers. According to researchers' estimates, its mass is between one million and ten million times that of the Sun.
As the star approached, extreme gravitational tidal forces stretched and disrupted it in a process known as a tidal disruption event. The interaction generated a luminous flare that peaked within 30 days, maintaining a radiating material temperature of around 20,000 degrees Celsius for over a month.
Implications and Remaining Mysteries
One intriguing possibility is that the black hole once belonged to a smaller dwarf galaxy that merged with a larger one. While the smaller galaxy lost most of its stars during the collision, its central black hole remained stranded in the outer regions. Furthermore, researchers found evidence suggesting that the host galaxy also harbors another active supermassive black hole at its core.
A secondary mystery emerged from radio observations: while the optical flare was detected early, a corresponding radio signal appeared only after more than a year. The findings, published in September on the arXiv repository, may help astronomers determine how many hidden supermassive black holes populate galactic outskirts.
