NASA telescopes witness star's dramatic meltdown, solve fast radio burst puzzle?
NASA telescopes played a game of cosmic hide-and-seek, observing a dead star known for erratic radio bursts. Their joint gaze captured the star's behavior mere minutes before and after it unleashed a powerful burst, offering astronomers a rare glimpse into these mysterious phenomena. These fleeting radio eruptions, known as fast radio bursts (FRBs), release immense energy in milliseconds, baffling scientists about their origins.
Until recently, they were observed solely from afar, leaving their source a cosmic whodunit. Then, in 2020, a burst within our own galaxy finally revealed a culprit: a magnetar, a super-dense remnant of a collapsed star. Enter SGR 1935+2154, a magnetar notorious for its antics.
In October 2022, it threw another tantrum, emitting an FRB scrutinized by NASA's NICER and NuSTAR telescopes. This unprecedented duo observed the magnetar for hours, witnessing its pre-burst behavior and the aftermath. The data revealed a surprising twist: just before the burst, the magnetar's spin dipped dramatically, 100 times faster than ever seen before.
This rapid slowdown hinted at a connection to the burst itself, a puzzle piece scientists are eager to fit in. The magnetar's volatile nature is no stranger to scientists. Its immense density creates a playground for extreme physics, with X-ray and gamma-ray outbursts commonplace.
Shortly before the 2022 FRB, a surge in these high-energy emissions hinted at brewing trouble. "All those bursts before might have had enough energy to create an FRB, but they didn't," explained Zorawar Wadiasingh, a researcher involved in the study. "Something changed during the slowdown, creating the right conditions." One theory points to the magnetar's unusual interior, where a superfluid
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