Black Hole's Prolonged Emission Following Star Disruption Observed

Astronomers have observed a supermassive black hole emitting a sustained jet of material for six years after consuming a star, an unprecedented duration for such events. The black hole, located approximately 665 million light-years from Earth, began this emission two years after disrupting a red dwarf star about one-tenth the mass of the Sun. The jet has since intensified, becoming one of the most powerful events detected in the universe.

Yvette Cendes, an astrophysicist at the University of Oregon and lead author of the study published in the Astrophysical Journal, noted the exceptional nature of this phenomenon. She stated that the source's luminosity has increased exponentially, now about 50 times brighter than when first discovered, and continues to brighten without signs of stopping.

Black holes are regions of space with gravitational fields so strong that not even light can escape. In this instance, the black hole's mass is approximately 5 million times that of the Sun, comparable to the supermassive black hole at the center of our own galaxy. The event, known as a tidal disruption event, occurs when a star ventures too close to a black hole and is torn apart by tidal forces.

Kate Alexander, an astrophysicist at the University of Arizona and co-author of the study, explained that after the star was torn apart, some of its gas fell toward the black hole and heated up, leading to the black hole consuming the star. The bright radio light observed is produced by material that approached but did not cross the event horizon, akin to a baby chewing food and spitting it out violently rather than swallowing it.

The researchers are investigating the cause of the prolonged and intense jet emission. Cendes suggested that magnetic fields around the black hole likely play a role, but the exact mechanism remains an active area of research. The team anticipates that the jet may peak later this year or next, with Alexander estimating that after the emission peaks, it should fade slowly, potentially remaining observable for a decade or more.