In 2018, a small star was cut into pieces while wandering near a black hole in a galaxy located 665 million light-years from Earth. While this was not a surprise at the time, researchers from Harvard Astrophysical Center observed an unusual phenomenon. According to astronomers, the star is ejected by the same supermassive black hole.

A team of researchers found an unusual spike as they revisited past events. tidal disturbances (TDE), which happens when invading stars are destroyed by black holes. TDEs are generally known to emit light when they occur. So when a star gets too close to a black hole, gravitational forces begin to stretch the star, eventually causing the material to heat up and create flares that astronomers can detect from millions of light-years away. .

Previous research at the Very Large Array (VLA) observatory in New Mexico, USA, showed that a black hole was mysteriously reanimated last June. The event was published last week in the Astrophysical Journal and is called AT2018hyz.

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a rare event

Scientists have collected observations of the phenomenon from several locations, including the ALMA Observatory in Chile, MeerKAT in South Africa, the Australian Compact Array of Telescopes in Australia, and the Chandra X-ray Observatory and the Neil Gerels Swift Observatory in space.

Although the destruction and removal of a star is impressive, it is not surprising. In this case, what intrigued scientists the most was the three-year time period during which the event must occur, the first time researchers have witnessed such a large delay between feeding and exit.

It’s worth noting that the devouring black hole hasn’t swallowed any other celestial bodies in recent years, which could be one of the reasons it dumps the remains of a star into space.

According to the lead author of the new study, Yvette Sendes, this phenomenon has never been observed anywhere. Thus, with the results of the study, astronomers can help more scientists better understand the feeding behavior of black holes.

“We’ve been studying TDEs with radio telescopes for over a decade and occasionally find them glowing in radio waves as they eject material while the star is being swallowed up by the black hole.”— said Edo Berger, professor of astronomy at Harvard University and co-author of the study. “But there was radio silence on AT2018hyz for the first three years, and it’s now brightly lit to become one of the brightest TDE radios ever seen.”Berger added.

See also: New image from the Hubble telescope captures the intersection of two galaxies

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Source: Harvard Center for Astrophysics.

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