Open AccessInvestigation of fast radio bursts on the BSA radio telescope of the Lebedev Physical Institute
Author(s) -
V. A. Fedorova,
А. Е. Родин
Publication year - 2022
Publication title -
astronomy at the epoch of multimessenger studies. proceedings of the vak-2021 conference, aug 23–28, 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.51194/vak2021.2022.1.1.146
Subject(s) - physics , astrophysics , log normal distribution , radio telescope , pulsar , scattering , dispersion (optics) , halo , galaxy , optics , statistics , mathematics
A comparative analysis of the observational characteristics of fast radio bursts at the frequencies of 111 and 1400 MHz iscarried out. Distributions are constructed with respect to the dispersion measure of radio bursts, which at both frequenciesare described by a lognormal distribution with parameters µ = 6.2, σ = 0.7. The dependence of the scattering value τ sc (DM )on the dispersion measure at 111 and 1400 MHz is also constructed, which is fundamentally dierent from the dependencefor pulsars. Comparative analysis of the relationship τ sc (DM ) at 1400 MHz and 111 MHz showed that the dependence forboth frequencies has the form τ sc (DM ) ∼ DM k , where k = 0.49 ± 0.18 and k = 0.43 ± 0.15 for the frequencies 111 and 1400MHz, respectively. The obtained dependence is explained by the theory of the extragalactic occurrence of fast radio burstsand the negligible contribution of intergalactic media to their scattering. From the dependency τ sc (DM ) a total estimate ofhostthe contribution to the DM of the matter of the halo of our and the parent galaxy is obtained DM halo + DM≈ 60 pc/cm 3 .1+zBased on the Log N - Log S dependence, the average spectral index of radio bursts α = −0.63 is derived.