Strange Transient Radio Pulses Provide Clues to Mysterious Origin — A mysterious cosmological |
Residing in the heart of a dwarf galaxy four billion light years away is a mysterious cosmological object producing bursts of energy that only last a few milliseconds. New research about this Fast Radio Burst has revealed a rarely seen astronomical environment around its source, where magnetic fields twist, turn, and undulate over time. This is the first detection of a magnetic field reversal observed from an FRB, and the first time this behavior has been observed in another galaxy.
An international team, led by a graduate research assistant at West Virginia University, Reshma Anna-Thomas, found the first evidence of magnetic field reversal in any FRB during the campaign. This discovery also strengthens the idea that at least a fraction of FRBs originate in a binary system, which is a system of two stars that orbit each other.
Anna-Thomas and team used the National Science Foundation’s Green Bank Telescope to observe FRB 20190520B for seventeen months—which is very brief, on astronomical time scales. The peculiar characteristics of the FRB inspired a deeper dive into the data, such as the high local dispersion measure, which is a sign of a dense local environment, and a persistent radio source co-located with the FRB.
Adds Ryan Lynch, a GBO scientist who supported this research, “The high sensitivity of GBT, its capabilities for observing high frequencies, and to record full polarization data, were crucial for the study. It’s one of the best telescopes available for studying FRBs.
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