Astronomers found a 'runaway star,' dubbed PG 1610+062, in the outer halo of the Milky Way.
A mysterious black hole—that has yet to be discovered—in one of our galaxy's spiral arms appears to have hurled a star across the Milky Way, an international team of astronomers has said.
Typically, the halo contains some of the galaxy's oldest stars and researchers had previously thought that PG 1610+062 was one of these with a mass around half that of our sun's. However, observations with the W. M. Keck Observatory revealed that the star is surprisingly young and ten times more massive than the sun.
Astronomers already know about a handful of objects in the galaxy known as"hyper-velocity stars"—rare objects which do travel at sufficient speeds to escape the galaxy by overcoming its strong gravitational pull.In order for this to be possible, these stars need to be accelerated to extremely high velocities by incredibly massive objects.
However in the latest study, the team made further observations of the runaway star with the European Space Agency's Gaia spacecraft, finding that, surprisingly, it did not originate from the Galactic Center but was ejected from the Sagittarius spiral arm of the galaxy instead.
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