An artist’s rendition of the two black holes orbiting each other in a gas disk that surrounds a supermassive black hole. (Credit: R. Hurt/IPAC/Caltech)

Team finds brand new type of black hole

"Astronomers were making bets if such black holes existed or not, and people believed they could not exist, but we found it."

U. Florida • futurity
Sept. 3, 2020 4 minSource

The discovery of a new type of black hole challenges prior understanding of how the mysterious cosmic objects form across the universe, according to a new study.

The researchers identified an intermediate mass black hole. The find serves as a missing link between known categories of black holes: smaller ones known as stellar mass black holes, and the largest known as supermassive black holes.

A team of researchers observed the black hole using twin detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) and the Virgo gravitational-wave detector in Italy.

These detectors are calibrated to sense tiny changes of distances on Earth that are then interpreted through algorithms to make sense of the cosmic communication.

In the five years since the  project discovered gravitational waves, scientists across the world have fine-tuned instruments measuring these gravitational waves to find new phenomenon in space. The gravitational waves help reveal what happens in the universe and can tell us about how black holes are formed.

To detect the first, and so-far only, intermediate mass black hole, the researchers invented and developed an algorithm called coherent WaveBurst.

“This black hole teaches us about the universe in ways that we weren’t previously aware of,” says Imre Bartos, an assistant professor at the University of Florida who chairs the LIGO working group currently searching for intermediate mass black holes.

Typically, there is a natural mass limit to black holes that can be anticipated and calculated using the mass of stars, as the gravitational collapse of stars forms the black holes. The intermediate mass black hole is heavier than one formed by the collapse of a star, but not as heavy as a supermassive black hole , meaning there is likely a different way black holes can form aside from stars colliding.

One possible explanation includes the collision of smaller black holes in an area so small these collisions happen by chance. The centers of galaxies are such locations, where tens of thousands of black holes can congregate within a light year from the center.

“We don’t totally understand where it is coming from or how it is formed, but this is the beginning of new physics,” says Sergey Klimenko, who pioneered development of searches for intermediate mass black holes in LIGO.

“Astronomers were making bets if such black holes existed or not, and people believed they could not exist, but we found it.”

The research will appear in Physical Review Letters.

Source: Emily Cardinale for the University of Florida

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