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Astron. Astrophys. 355, 79-88 (2000)

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The asymmetries in radio source structures

II. Generalized kinematical model

Stanisaw Ry

Astronomical Observatory of the Jagiellonian University, Ul. Orla 171, 30 244 Kraków, Poland (strys@oa.uj.edu.pl)

Received 7 May 1999 / Accepted 5 October 1999


This paper introduces the general formulation of a kinematical model which allows us to detect and calculate the asymmetries in the brightness distribution of double radio sources. It is shown that the asymmetry differs from that caused by pure Doppler effects, and a method of approximation of the intrinsic asymmetries is given. Two kinds of temporal evolution (i.e. power law and exponential law) are considered, providing two different types of asymmetry. Apart from the usual interpretation of the mathematical rules of asymmetries, a nonstandard interpretation of the parameters of the kinematical model is suggested. Finally, this paper argues that a considerable part of the observed asymmetry can be caused by surrounding matter and that the parameters of the model can be used to approximately determine the inhomogeneity of the surroundings deduced from a single map.

Key words: radio continuum: galaxies – galaxies: active – galaxies: jets – galaxies: quasars: general

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© European Southern Observatory (ESO) 2000

Online publication: March 17, 2000