A Black Hole Burps out Material, Years After Feasting on a Star universetoday storybywill
Artist’s impression of a powerful outburst sparked by a magnetic reversal in a distant galaxy. Credit: NASA/Swift, a professor of astronomy at Harvard University and the CfA and a co-author on the new study, the radio observations of the TDE proved to be the most striking:
“We have been studying TDEs with radio telescopes for more than a decade, and we sometimes find they shine in radio waves as they spew out material while the star is first being consumed by the black hole. But in AT2018hyz there was radio silence for the first three years, and now it’s dramatically lit up to become one of the most radio-luminous TDEs ever observed.The team concluded that this resulted from the black hole ejecting residual material from the star at relativistic speeds .
In some cases, spaghettified material will be thrown back into space, which astronomers liken to black holes being “messy eaters.” However, the outflow emissions normally develop quickly after a TDE occurs and not years later. In short, said Cendes, it’s as if this black hole began abruptly burping out a bunch of stellar material it ate years ago.
“This is the first time that we have witnessed such a long delay between the feeding and the outflow. The next step is to explore whether this actually happens more regularly and we have simply not been looking at TDEs late enough in their evolution.” These results, along with observations of similar events, will help astronomers to better understand the feeding behavior of black holes. This, in turn, could provide insight into how they grow and evolve with time and their role in galactic evolution.
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