Black Hole's Prolonged Emission Following Star Disruption Observed

Astronomers have observed a supermassive black hole, located approximately 665 million light-years from Earth, emitting a fast-moving jet of material for six years following the disruption and consumption of a star. This duration is unprecedented for such events.

The black hole, with a mass about five million times that of the Sun, resides at the center of a distant galaxy. The event began when a red dwarf star, roughly one-tenth the mass of the Sun, ventured too close and was torn apart by the black hole's intense gravitational forces—a phenomenon known as a tidal disruption event.

Notably, the ejection of material did not commence until two years after the star's destruction, and the jet has been intensifying over the subsequent six years. University of Oregon astrophysicist Yvette Cendes, lead author of the study published in The Astrophysical Journal, remarked, :

"The exponential rise in the luminosity of this source is unprecedented. It's now about 50 times brighter than when it was first discovered and is now incredibly bright for an object in radio waves. This has been going on for years now and no sign of stopping. That is super unusual."

The delayed onset and prolonged emission challenge existing models of black hole behavior. Researchers are investigating the mechanisms behind the formation and persistence of such relativistic jets, with magnetic fields around the black hole being a potential factor. The team anticipates that the jet may reach its peak brightness later this year or next, after which it is expected to gradually fade over the next decade or more.