Scientists discover a repeating fast radio burst (FRB) that never stops, surrounded by a highly changeable magnetic field.
Using the five-hundred-meter Aperture Spherical Radio Telescope in China, astronomers identified the repeated burst in 2022 as FRB 20190520B. FRB 20190520B, which produces radio bursts a few times an hour, occasionally at different radio frequencies, is the rarest repeating FRB of all. Astronomers hurried to extend the original study using additional radio frequencies after discovering this exciting phenomenon.Further research revealed that FRB 20190520B is located in a 3.
. The electromagnetic waves in these high-frequency transmissions turned out to be highly polarized, which means they are "waving" in one direction considerably more powerfully than in others.Different frequencies cause this polarization to shift in direction, and monitoring how much it varies lets us know how strong the magnetic field was when the signal passed through. This polarization measurement indicates a highly magnetized environment surrounding FRB 20190520B.
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