Abstract
This work presents the results of the analysis of long-term monitoring (over 40 years) changes in radio fluxes of the two extragalactic sources - 3C 446, and BL Lac. Observations at frequencies of 14.5, 8, 4.8 GHz were obtained in the Michigan Radio Astronomy Observatory (UMRAO). With using Fourier filtering were selected O - C (short-periodic), and the trend components of flux variations that were analyzed separately with using the wavelet-analysis method. Each of these components is associated with certain physical processes in the “core-accretion disk-jet” system. Were constructed time-frequency waveletspectra showing the changes of the frequency composition of the investigated data over time. For the trend component values of the main periods of ~ 4-9 years (3C 446) and ~ 8 years (BL Lac), for O - C component - ~ 0.8-3 years (3C 446) and ~ 0.6-4 years (BL Lac) and they appear in the time and structural changes of the jet. On the basis of calculating the global wavelet-spectra in the frequency range identified main phases activity of radio sources. Obtained comparison between the dynamics of jets (Mojave VLBI images), and change the frequency spectral structure of the studied data. With bandpass wavelet filtering, flux components corresponding to the main periods in the spectra, were identified and also found the delay between the observation frequencies in spectral bands of these periods.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
