Fast radio bursts – intense, milliseconds-long flashes of radio energy from outer space – have puzzled astronomers since they were first spotted in 2007.
by astronomers at the Five-hundred-meter Aperture Spherical radio Telescope in China. Repeating fast radio bursts are rare, but FRB 20190520B is the rarest of all: it is the only one that never rests, producing radio bursts a few times an hour, sometimes at multiple radio frequencies.
What else can we learn about this intergalactic firecracker and its environment? We carried out observations of FRB 20190520B using CSIRO's Parkes radio telescope, Murriyang, in New South Wales and the Green Bank Telescope in the United States. We found the direction of this polarization changes at different frequencies. Measuring how much it changes tells us about the strength of the magnetic field the signal has traveled through.
France Dernières Nouvelles, France Actualités
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