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The mystery of non-repeating radio signals from space has been revealed

19 июня 2024

The mystery of non-repeating radio signals from space has been revealed

Astronomers at the University of Toronto have solved the mystery of the origin of fast radio bursts (FRBs) thanks to a new way of analyzing data from the CHIME experiment. According to the results of a study published in The Astrophysical Journal, it showed that the polarized light from 128 non-repeating FRBs probably comes from ordinary galaxies like our Milky Way, with moderate density and moderate magnetic fields.

FRBs are extremely energetic bursts of millisecond-long radio waves originating from distant cosmic sources. Previous research has focused on hyperactive repetitive radio signal sources originating in dense, magnetized environments, which are assumed to be associated with magnets. However, only three percent of FRBs are repetitive.

In the new work, the scientists analyzed data on non-repeating radio bursts obtained by the CHIME radio telescope, which maps the intensity of radio signals from hydrogen accumulations. To do this, a new method was used that takes into account not only the brightness of the FRB, but also the polarization angle of electromagnetic waves. This allowed us to obtain additional information about the origin of the radiation from the FRB and the medium through which it passed.

It turned out that the direction of polarization of light from the FRB varies with time and depending on the wavelength, which helps to determine the local density of the medium and the strength of the magnetic fields through which the radio waves passed. Most non-repetitive FRBs occur under less extreme conditions compared to repetitive FRBs. This may indicate the presence of two different FRB populations or more mature versions of the same population, but with a lower frequency of bursts.

Source: Lenta.RU