Colliding black holes have generated space-time ripples that have taught scientists a lot about these enigmatic cosmic objects. These gravitational waves provide information about black holes' mass, shape, spinning rate, and orientations.
A team of researchers from different universities found evidence that the black hole collision that led to odd gravitational waves in 2019 was due to a unique set of circumstances. They reported their findings in the study, titled "GW190521 as a Dynamical Capture of Two Nonspinning Black Holes," published in Nature Astronomy.
Colliding Black Holes Created Space-Time Ripples Like No Other, Similar to Waves on the Surface of Water
Black Hole Collision Resulted in Unique Gravitational Waves
The researchers described in their study through modeling and simulating the conditions that could lead to the creation of the unique gravitational wave signature.
According to Science Alert, the development of gravitational wave detectors led to a better understanding of what happens during the collision of black holes. Mostly, it happens due to binary stars exploding and spiraling toward each other until they merge at the gravitational center.
Two Black Holes Met by Chance, And It Created Something Never Seen Before https://t.co/OidWcXYv14
— ScienceAlert (@ScienceAlert) November 24, 2022
But out of more than 90 mergers detected so far, the GW19052 collision detected on May 2019 stood out as it caused space-time ripples like no other. Rossella Gamba, an astrophysicist from the University of Jena in Germany, said in a press release: "Its morphology and explosion-like structure are very different from previous observations."
She added that they initially thought it was the merger of two rapidly rotating heavy black holes approaching one another in almost circular orbits. But they proposed other possible interpretations due to its special features, particularly gravitational wave signals' short, sharp duration.
The actual merger of two black holes can cause gravitational waves, like a ripple on the surface of the water, when a rock is dropped. But they can also be generated by the binary inspiral, and intense gravitational interaction could send weaker ripples as the two black holes move closer.
Astronomer Alessandro Nagar from the National Institution for Nuclear Physics in Italy explains that the shape and brevity of less than a tenth of a second of the signal led them to hypothesize that an instantaneous merger between two black holes occurred.
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Colliding Black Holes Were not Part of a Binary System
The team created simulations to test their hypothesis by tweaking the black hole's trajectory, spin, and mass to reproduce the weird gravitational wave signal detected in 2019.
They found that the two black holes were larger than average and did not start as part of a binary system, Phys.org reported. The findings suggested that instead of originating from a binary system, the two black holes were single objects moving randomly through space and crossed paths closely enough to pull each other closer and merge.
In this scenario, the two black holes must have belonged to a cluster of holes that would have increased the likelihood of them randomly crossing each other's paths.
The last simulation showed that the black holes were moving and then passing near each other, making them swerve dramatically and bring each other toward one another until they eventually smashed and merged, which resulted in a dynamic capture, as researchers concluded.
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