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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
A. E. Wright, J. G. Ables, and D. A. Allen, Mon. Notic. Roy. Astron. Soc. (ISSN 0035-8711) 205, 793 (1983).
R. C. Vermeulen, et al., Astrophys. J. Letters 452, L5 (1995).
I. Fejes, R. W. Porcas, and Chidi E. Akujor, Astron. Astrophys. 257, 459 (1992).
C. Reynolds, et al., New Astronomy Reviews 47, Nos. 6-7, 641-644 (2003).
M. L. Lister, et al., Astron. J. 146, 120 (2013).
C. Barbieri, et al., Astron. Astrophys. 142, 316 (1985).
B. H. Andrew, et al., Astron. J. 83, 863 (1978).
Y. C. Guo, et al., Astron. Astrophys. 0510 (2014).
M. F. Aller, H. D. Aller, and P. A. Hughes, Bulletin of the American Astron. Soc. 33, 1515 (2001).
I. Gaidyshev, Data Analysis and Processing (Special Handbook) [in Russian], Izdatel’skii dom “Piter” (2001).
A. V. Davydov, UGGU, IGiG, Geoinformation Dept. (2007).
N. M. Astaf’eva, Wavelet analysis, Usp. Fiz. Nauk 166, 11 (1996).
V. V. Vityazev, UGGU, IGiG, Geoinformation Dept. (2001).
N. Smolentsev, Wavelet analysis in MATLAB, DMK-Press (2010).
M. L. Lister, et al., Astron. J. 137, 3718 (2009).
A. B. Shitov, Ivanovo State University (2001).
E. A. Dibai, Izd. Moskovskogo Universiteta (1987).
E. A. Dibai and V. M. Lyutyi, Astron. zh. 61, 10 (1984).
Hiroki Nagakura and Shoichi Yamada, Astrophys. J. 689, 391 (2008).
A. P. Marscher, ASP conference ser. 386 (2008).
F. Meyer and E. Meyer-Hofmeister, Astron. Astrophys., preprint arXiv:astro-ph/0207573v1 (2002).
F. M. Rieger, http://arXiv.org/abs/astro-ph/0506720v1
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated from Astrofizika, Vol. 58, No. 1, pp. 5-18 (February 2015).
Rights and permissions
About this article
Cite this article
Sukharev, A.L. Variability of the Extragalactic Radio Sources 3C 446 and BL Lac in the Centimeter Wavelength Range. Astrophysics 58, 1–13 (2015). https://doi.org/10.1007/s10511-015-9361-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10511-015-9361-1