Astronomers for the first time conducted a detailed spectropolarimetric
the analysis of fast burst that is simultaneously recorded all the components
polarization at multiple wavelengths with high time resolution.
It turned out that the surge FRB 181112 consists of several separate pulses,
which differ in many ways. The findings suggest that the data
features are associated either directly with the mechanism of radiation, or there were
when moving through a relativistic plasma, but a final conclusion about the nature
these sources while make still fails, write the authors in the accepted for publication in The Astrophysical Journal LettersPreprint
on the server arXiv.org.
Fast radio bursts (Fast Radio Bursts, FRB) — is a powerful source of radiation
radio that Shine in the order of several milliseconds. Separate
and resurgence: the first known over hundreds, and the second about two dozen.
For some FRB managed to measure the red shift — it was significant,
in the range of about from 0.2 to 0.6.
At the moment, the nature of this type of radiation is not clear,
while on this subject, proposed dozens of hypotheses. Determination of the mechanism of radiation and
kind of radiating objects is complicated by the uncertainty of many basic
the physical characteristics of the FRB.
In particular, it is unknown the minimum characteristic time of energy release in
during the surge, which allows us to estimate the physical size of the radiating
region. Also still unclear what caused the short duration bursts and it is not clear whether it is based on such a quick process, or it formed a narrow cone
radiation, that the rotation is briefly crosses the line of sight.
Astronomers from South Korea, Australia and the USA presented
results spectropolarimetric analysis of radiation of individual burst FRB
181112. It originated in a galaxy at redshift z = 0,4755, but on the way to the Ground also
crossed the halo of another galaxy at z = 0,3674. The high temporal resolution available on
the Australian ASKAP radio interferometer, has allowed four separate
pulse within the burst and the first to measure fully all of the components
polarization in each of them.
It turned out that the individual pulses may vary in the parameters.
In particular, their intensity are different: the first, the brightest, the third substantially
weaker and the second and fourth so weak that it is not possible to measure all
settings. The onsets of the pulses it does not correspond to any obvious periodicity.