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Astronomers testify to "one of the most extraordinary black hole systems"



The black hole, known as V404 Cygni, does not behave like others. The nozzles may shoot out within a few minutes and in all different directions. And although the researchers admit that black holes are among the most extreme objects in the universe, this is something else.

"This is one of the most extraordinary black hole systems I have ever encountered," study author James Miller-Jones said in a statement. Miller-Jones is also Associate Professor at Curtin University's International Center for Radio Astronomy Research.
The study was published on Monday in the journal Nature.

"Like many black holes, it attracts a nearby star that pulls gas away from the star and forms a disk of material that surrounds the black hole and the spirals under it," he said. What is different in V404 Cygni is that we think the material disk and the black hole are misaligned, which seems to cause the inner part of the disk to wobble like a gyroscope and shoot nozzles in different directions when the disk is spinning Alignment changes. "

The black hole was first discovered in 1

989 because it released rays and rays. Earlier outbreaks associated with this black hole were found on archival photographic plates in 1938 and 1956.

V404 Cygni caught the attention of astronomers around the world when it triggered another major outbreak that lasted two weeks in 2015 over the event, which resulted in a wealth of observational data.

Normally, nozzles shoot out of the poles of the black holes. These nozzles were fired for several hours at different speeds in different directions.

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The black hole itself is spinning and the attraction is so strong that it actually involves space and time nearby. This is called frame dragging.

The material in the nozzles is blasted from the spinning accretion disk of the black hole. The disk forms when material from a nearby star is drawn into a circle around the black hole.

When scaled, the black hole is nine times the size of our sun, and the V404 Cygni's disk is 10 million kilometers wide. The nozzles eject material at 60% of the speed of light.

Because the spin axis of the black hole is misaligned, dragging the frame also distorts a portion of the plate, causing a strong wobble that is responsible for firing the nozzles in different directions.

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"This is the only mechanism This can explain the rapid precession we see in V404 Cygni, "Miller-Jones said." You can think of it like the jiggling of a gyro when it slows down, only in this case it gets shaky caused by Einstein's general theory of relativity. "

The researchers had to use a different technique to capture what had happened in the black hole, usually using long shutter speeds.

" These jets changed so fast that we were in one four-hour picture saw only a blur, "said Alex Tetarenko in a statement, another of the study authors and the East Asian Observatory Fellow.

Instead, 70 seconds La Single exposures were combined to make a film about the actions of astronomers.

"We were stunned by what we saw in this system – it was totally unexpected," Greg Sivakoff said in a statement, a study author and associate professor at the Faculty of Physics, University of Alberta. "Finding this astronomical premiere deepened our understanding of how black holes and galaxy formation can work, and it adds a little more to this big question:" How did we get here? ""

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