As mankind's ancestors learned to walk upright, the launch began from the supernatural black hole in the center of our galaxy at a whopping 3.7 million km / h (6 million km / h).
Five million years after this dramatic ejection, a group of researchers led by Sergei Koposov of the McWilliams Center for Cosmology, Carnegie Mellon University, spotted the star, known as the S5-HVS1, in a Crane-shaped constellation. The star has been observed traveling relatively close to Earth (29,000 light-years away) with unprecedented driving speeds – about 10 times faster than most stars in our galaxy.
"The speed of the discovered star is so high that it will inevitably leave the galaxy and never return," said Douglas Bubert, a research fellow at Oxford University and co-author of the study. it said in a statement.
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"This is super exciting because we have long suspected that black holes can eject stars at very high speeds. However, we have never had the unambiguous association of such a fast star with the galactic center," Koposov said in a statement.
The launch was revealed by injections from the Anglo-Australian Telescope (AAT), a 12.8-meter (3.9-meter) telescope and the European Space Agency's Gaya satellite. The discovery was made as part of the Southern Stellar Stream Spectroscopic Survey (C5), a collaboration of astronomers from Chile, the United States, the United States and Australia.
Now that the star has been spotted, researchers could track the star back to Sagittarius A *, the black hole in the center of the Milky Way. It also serves as a stunning example of the Hills mechanism, proposed by astronomer Jack Hills 30 years ago, in which stars are ejected from the centers of galaxies at high speed after the interaction between the binary star system and the black hole in the center of the galaxy.
"This is the first clear demonstration of the Hills mechanism in action," said Ting Lee, a colleague from Carnegie Observatories and Princeton University, who led the S5 collaboration. "Seeing this star is really amazing because we know it has to form in the galactic center, a place very different from our local environment. It's a visitor from a strange country. "
"While the main scientific goal of the S5 is to investigate star streams – disrupting dwarf galaxies and globular clusters – we have dedicated the instrument's spare resources to search for interesting Milky Way targets, and voila, we found something amazing for free." & # 39; With our future advances, I hope we find out more! "Killer Cowen, deputy technology director at the Lowell Observatory, which is part of the S5 executive committee, added in a statement.
This discovery was published in a study on 4 November in the Monthly Notices of the Royal Astronomical Society.