Five million years ago, when the ancestors of humanity had just learned to stand upright, from Sagittarius A * a supermassive black hole in the center of the Milky Way Galaxy, a star with a shocking 3 was thrown out. , 7 million an hour. This month, a group of researchers spotted a superfast star traveling relatively close to Earth.
Researchers led by Sergei Koposov from the Carnegie Mellon Center for Cosmology at McWilliams University as part of the Southern Star Stream Spectroscopy (S5) have noticed a star ̵
Researchers say the "traveling" star travels at a speed about 10 times faster than most other stars in the galaxy. "The speed of the open star is so high that it will inevitably leave [Milky Way] and never return," said Oxford University co-author Douglas Buber.
"This is super exciting because we have long suspected that black holes can eject stars at very high speeds," said Koposov. "However, we have never had an unambiguous connection to such a fast star with the Galactic Center." ] Astronomer Jack Hills first suggested that black holes could cast superfast stars at high speeds, but the S5-HVS1 is the first time scientists have witnessed the Hills mechanism in action.
made using the 12.8-foot Anglo-Australian telescope and the European Space Agency's Gaia satellite.The relative proximity of the star allowed for an "unprecedented" opportunity to learn about the phenomena.
"Seeing this star is really amazing," said Ting Li of Carnegie. "As we know it must have formed at the Galactic Center, a place very different from our local environment. It is a visitor from strange land."
Koposov and his team are now able to trace the star's journey back to the center of the galaxy . They hypothesize that the S5-HVS1 lived with a comrade star, but when the two got too close to Sagittarius A * his companion was captured while being ejected.
"My favorite part of this discovery is to think where this star came from and where it goes," said Alex G from Carnegie. "He was born in one of the craziest places in the universe, near a supermassive black hole with a lot of other close star friends; but he will leave our galaxy and die alone, in the middle of nowhere. Quite a fall from elegance. "