08. Факультет математики, фізики та інформаційних технологій

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https://dspace.onu.edu.ua/handle/123456789/28

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Перегляд 08. Факультет математики, фізики та інформаційних технологій за Автор "Aller, M. F."

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  • Ескіз
    Документ
    Flux density evolution of the sources 3C273, 3C279 and 3C454.3 at the frequencies 102 MHz–36.8 GHz
    (2007) Volvach, A. E.; Volvach, L. N.; Larionov, M. G.; Aller, H. D.; Aller, M. F.; Yurovskiy, Yu. Yu.; Ryabov, Myhaylo I. ; Рябов, Михайло Іванович; Madrid : Consejo Superior de Investigaciones Científicas, Instituto Miguel Asín,
    The results of long-term monitoring of the sources 3C273, 3C279 and 3C454.3 at 102 MHz–36.8 GHz are presented. Numerical analysis of irregular temporal rows of the integral fluxes allowed us to detect the quasiperiodic constituents of the emission flux variations. The analysis of the parameters of binary black holes in the central regions of non-stationary objects demonstrates that these super-massive objects have an insignificant variation between the sizes of the orbits of partners, and that they are in the stage of evolution different from the time of merging by a period of less than 104 years.
  • Ескіз
    Документ
    Singular-Spectrum Analysis and Wavelet Analysis of the Variability of the Extragalactic Radio Sources 3C 120 and CTA 102
    (2016-06) Donskykh, Ganna I.; Ryabov, Myhaylo I. ; Sukharev, Artem L.; Aller, M. F.; Рябов, Михайло Іванович
    This is a study of the variability of the fluxes of radio emission from the quasar CTA 102 and the radio galaxy 3C 120 based on data from the University of Michigan Radio Astronomy Observatory (UMRAO, Ann Arbor). The data were obtained at three frequencies (14.5, 8, and 4.8 GHz) with the 26-m radio telescope. Two mutually complementary methods were used for the analysis: wavelet analysis and singular spectrum analysis. Wavelet analysis is based on the Fourier transform, while singular-spectrum analysis does not use an analyzing function. Long-duration components of the variability in the range of ~4-11 years were found for 3C 120 and ~1.5-3 years, for CTA 102. The short-duration components of the variability are characterized by periods of ~0.7-3.4 years for 3C 120 and ~0.5-0.8 years for CTA 102. These data were also compared with VLBI charts from the MOJAVE archive for studying the evolution of the components in the jets of the quasars studied here.
  • Ескіз
    Документ
    The catalog of periods of the variability of blazars 3C120, 3C273, 3C279, 3C345 and 3C454.3 at centimeter and millimeter wavelengths
    (Odessa I.I. Mechnikov National University, 2009) Volvach, A. E.; Ryabov, Myhaylo I. ; Volvach, L. N.; Sukharev, Artem L.; Aller, H. D.; Aller, M. F.; Рябов, Михайло Іванович
    ccVariations in the radio flux of 3C120, 3C273, 3C279, 3C345, 3C 454.3 are analyzed using long-term monitoring data at five frequencies from 4.8 to 36.8 GHz obtained at the University ofMichigan Radio Astronomy Observatory and the Crimean Astrophysical Observatory. A spectral analysis of the light curves at the various frequencies reveals the presence of periodic components. Using method of model calculations for each of the found period tested its ability to reproduce the observed flux variability at different frequencies. On the basis of the model calculations presented the catalog of the most reliable periods of flux variable of radio sources.