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Binary supermassive black holes have been discovered. The pair are in galaxy NGC 7674 a light year apart and orbit every 100,000 years. They have a combined mass forty million times that of the sun. Only one other set have ever been located. In galaxy collision the black holes generally merge.
Boffins discover tightest black hole binary system – and it's supermassive
www.youtube.com/watch?v=LlAeoKzsk_Q
Boffins discover tightest black hole binary system – and it's supermassive
NGC 7674Scientists have discovered the closest-ever supermassive black hole binary system. It's in the spiral galaxy NGC 7674, and the pair of voids are separated by a distance of less than one light year.
Supermassive black hole binaries are rare. Until now, astronomers have only spotted one so far, about 24 light years apart. Finding two systems is important, as it provides more evidence that supermassive black holes collide in galaxies, and are the source of gravitational waves.
A paper published in Nature Astronomy on Tuesday shows that the black holes were found using a technique known as very long baseline interferometry, where data is collected by several radio telescopes simultaneously.
The researchers focused on the central region of NGC 7674 and detected two bulges at frequencies indicative of growing monstrous black holes.
Preeti Kharb, co-author of the paper and a researcher at the Tata Institute of Fundamental Research, India, said: "The two radio sources have properties that are known to be associated with massive black holes that are accreting gas, implying the presence of two black holes."
The supermassive black holes have a whopping combined mass of about forty million times the mass of the Sun, and an orbital period of one hundred thousand years.
Single gigantic black holes gorging on surrounding matter are believed to exist in the centers of most large galaxies. Scientists believed that since galaxies collide and merge, the black holes might become entangled together to become a binary system. As they get closer and closer to one another, they cannot escape each other's gravity, and end up smashing into each other, sending gravitational waves rippling through spacetime.
Three confirmed signals from these ripples have been detected by the Laser Interferometer Gravitational-wave Observatory since 2016.
NGC 7674 falls into the family of luminous infrared galaxies and is featured in Arp's Atlas of Peculiar Galaxies as number 182. It is located in the constellation of Pegasus, the Winged Horse, about 400 million light-years away from Earth.
www.youtube.com/watch?v=LlAeoKzsk_Q
Published on Sep 19, 2017
Second supermassive black hole binary system discovered, formed due to galaxy merger
Second supermassive black hole binary system discovered, formed due to galaxy merger
Black holes are dark and mysterious, but pretty commonplace. Even their larger counterparts, superma...
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