Black holes are more wasteful eaters than expected
Published: August 6, 4:00 p.m.
An international research team led by astronomers at the University of Warwick has found that the black hole Swift J1727.8−1613 pulls in matter much less efficiently than earlier theories suggested. Observations indicate that black holes send a large portion of incoming material back into space, and powerful gas outflows can persist even after the object's activity has almost completely faded.
Using the European Southern Observatory's Very Large Telescope, the researchers tracked the system through nearly the whole flare cycle. The black hole pulls gas away from a neighboring star, and while some of that gas eventually spirals into the black hole from the accretion disk, the rest is expelled outward in jets and streams. Remarkably, these ejections kept occurring even when the system's brightness had dropped to about one percent of its peak level.
What the observations show
The black hole first flared to life in 2023, giving scientists a rare chance to monitor the event closely. Their findings challenge the long-standing assumption that nearly all material entering a black hole's gravitational reach is swallowed. The evidence of substantial outflows points to additional physical mechanisms inside accretion disks and suggests a more complex interaction between black holes and their surroundings. It also underscores how valuable continued monitoring of such systems could be for understanding black hole behavior in general.
SciTechDaily reported on the study, which opens fresh avenues for exploring black holes and how they interact with the space around them. At a time when black hole feeding mechanisms remain one of astrophysics' biggest open questions, this work offers one of the most detailed views yet of an outburst as it unfolded.
This discovery raises important questions about the nature of black holes, particularly their interactions with surrounding matter. For instance, a recent incident where a star was ripped apart by a wandering supermassive black hole highlights the dramatic effects these cosmic giants can have on their environment. To explore this event and its implications further, you can read more about it here.