Years after ripping stars to shreds, 24 black holes suddenly flared up with radio waves in inexplicable 'burping' bouts. Half of all star-killing black holes may experience the same.
Astronomers made the discovery after spending years watching black holes involved in tidal disruption events .
Some of the stellar material of the destroyed star is flung away from the black hole while the rest forms a thin frisbee-like structure around it called an accretion disk, which gradually feeds that material to the black hole. In its early days, the accretion disk is unstable, and matter sloshes around and smashes into itself, causing outflows detectable by radio waves. But astronomers traditionally only look at these star-eating black holes for a few months following the TDEs.
The re-emission of this material for 10 of the 24 black holes happened between two and six years after the star-destroying events. The observations are described in a study uploaded Aug. 25 to the preprint database arXiv, which has not yet been peer-reviewed. Black holes are marked by an event horizon, the point at which gravity is so strong that not even light can escape."Black holes are very extreme gravitational environments even before you pass that event horizon, and that's what’s really driving this," Cendes said."We don’t fully understand if the material observed in radio waves is coming from the accretion disk or if it is being stored somewhere closer to the black hole. Black holes are definitely messy eaters, though.
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