Astrophysics

, Volume 60, Issue 3, pp 313–324 | Cite as

Effect of the Nonuniformity of Radio Sources on Estimates of Their Physical Parameters

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Estimating the physical parameters of nonuniform radio sources in active galactic nuclei (AGN) requires knowledge of the angular dimensions of radio sources at the low frequencies where a steep slope (cutoff) in the low-frequency spectrum (opacity region) is observed. In most compact radio sources, the low-frequency cutoff lies in the meter wavelength range. At present there are no VLBI systems operating at meter wavelengths, so the low-frequency dimensions of compact radio sources in AGN cannot be measured directly. Here we propose a method for estimating the low-frequency angular dimensions of compact radio sources (in the opacity region) based on the shape of their spectra.

Keywords

active galactic nuclei radio jets magnetic fields 

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© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.P. N. Lebedev Institute of PhysicsRussian Academy of SciencesMoscowRussia
  2. 2.Rheinische Friedrich-Wilhems-UniversitätBonnGermany

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