Till now, only one repeating fast radio burst - FRB20201124A, has been reported with circular polarization.
The latest research by scientists at the National Astronomical Observatories of the Chinese Academy of Sciences has identified circular polarization in active repeating fast
. The results were based on precise observations of the Five-hundred-meter Aperture Spherical Telescope .FRBs hold the distinction of emitting the most luminous radio flashes in the universe, with the energy released in one such incident rivaling the Sun's output "over a whole day or even a month to a year," according toThe first FRB was recorded in 2007, and around 600 such events have been identified since then.
Researchers could use data captured by FAST to record active episodes for these two FRBs, allowing the team to identify the precise characterization of their polarization.Only two out of the 600 known FRBs - FRB 20121102A and FRB 20190520B, are found to coincide with a compact persistent radio source. Researchers attribute their young age to their extreme activity.
Researchers attribute two possible mechanisms behind circular polarization, and these are various processes during propagation and a radiation mechanism intrinsic to the. "During propagation, multipath propagation and Faraday conversion could, in some circumstances, generate circular polarization." said the team.
Multipath propagation is a result of electromagnetic radiation traveling in an inhomogeneous magneto-ionic environment. "Faraday conversion is a relatively weak effect and generates observable circular polarization only when propagating through an extremely magnetized region with magnetic field reversals or propagating through strongly magnetized plasma consisting of relativistic electrons," said the researchers.
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