This orange dot represents a gamma-ray burst, thought to indicate an extraordinary event.
ESO/A. Levan, A. Martin-Carrillo et al.
A black hole that has consumed a star appears to have avenged itself by devouring the star from within, generating a gamma-ray burst located approximately 9 billion light-years from Earth.
This burst, known as GRB 250702B, was initially identified by NASA’s Fermi Gamma-ray Space Telescope in July. Such bursts are brilliant flashes of light due to jets produced by high-energy occurrences, like massive stars collapsing into black holes or the merging of neutron stars, and generally last only a few minutes.
However, GRB 250702B lasted an astonishing 25,000 seconds, equating to about 7 hours, which makes it the longest gamma-ray burst on record. Researchers have struggled to account for this phenomenon, but Eliza Knights and her team at NASA’s Goddard Space Flight Center propose an unusual and rare scenario.
“The only [model] providing a natural explanation for the characteristics observed in GRB 250702B involves a stellar-mass black hole falling into the star,” the researchers mentioned in their published study.
In a typical long gamma-ray burst, a massive star collapses to create a black hole and emits a jet during its demise. In this situation, however, the research team posits the inverse. An existing black hole spiraled into a companion star, whose outer layers had expanded during its later stages, resulting in the black hole losing angular momentum and descending toward the star’s center.
The black hole then incinerated the star from the inside, producing a powerful jet perceived as GRB 250702B, potentially causing a faint supernova, although it remained too dim for detection at this distance by the James Webb Space Telescope.
This theory is beneficial for understanding the mechanisms behind ultra-long bursts. Hendrik van Eerten from the University of Bath, UK, remarks, “The arguments presented in this paper are very persuasive.”
Knights and her team hope that, with the help of telescopes like the Vera Rubin Observatory in Chile, we may observe more such events in the future. Meanwhile, van Eerten describes the gamma-ray burst as “absurd.”
Topic:
Source: www.newscientist.com
