Black Hole Hurls Out A Star From Milky Way

    • NYT News Service
    • Publish Date: Nov 18 2019 12:54PM
    • |
    • Updated Date: Nov 18 2019 12:54PM
Black Hole Hurls Out A Star From Milky Way

There are fastballs, and then there are cosmic fastballs. Now it seems that the strongest arm in our galaxy might belong to a supermassive black hole that lives smack in the middle of the Milky Way.

Astronomers recently discovered a star whizzing out of the center of our galaxy at four million miles an hour. The star, named S5-HVS1, is currently about 29,000 light-years from Earth, streaking through the Grus, or Crane, constellation. It is headed for the darkest, loneliest depths of intergalactic space.

The runaway star was spotted by an international team of astronomers led by Ting Li of the Carnegie Observatories. They were using a telescope in Australia for a study known as the Southern Stellar Stream Spectroscopic Survey. The star is about twice as massive as our own sun and ten times more luminous, according to Dr Li.

Drawing on data from the European Space Agency’s Gaia spacecraft, the astronomers traced the streaking star back to the galactic center. That is the home of a black hole known as Sagittarius A*, a gravitational monster with the mass of four million suns.

The astronomers hypothesise that the runaway star was once part of a double-star system that came too close to the black hole. One of the pair fell in, and the other was sling-shotted away at hyper speed. The process, a threebody gravitational dance, was first predicted by Jack Hills, a theorist at Los Alamos National Laboratory, in 1988. The dance with S5-HVS1 unfolded about 5 million years ago, according to Dr Li and her team.


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