Abstract
We consider the impact that environmental factors have on various asymmetries in radio sources, including the lobe-luminosity ratio (R). Using the exponential form of the time evolution of the brightness of radio sources, we obtain an expression, which enabled us to qualitatively and quantitatively show that on the average, the observed lobe-luminosity ratio is about 12–71 % less than nominal value predicted by pure relativistic/Doppler beaming due to environmental influences. These environmental factors have stronger effect on sources with R<1 than on sources with R≥1. Our result also indicates that the environmental effect increases as source size decreases and is thus, stronger for Compact Symmetric Sources (CSSs) than for extended FR II radio galaxies and quasars. Our result also suggests that misalignment in radio sources may have resulted from interaction with environment, indicating that misaligned radio sources may be situated in anisotropic environment.
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The authors wishes to thank the anonymous referee for useful comments made towards improving the quality of the paper and the explanation of some basic concepts.
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Onuchukwu, C.C., Ubachukwu, A.A. Kinematic asymmetries in extragalactic radio sources II—Environmental effects. Astrophys Space Sci 357, 145 (2015). https://doi.org/10.1007/s10509-015-2386-4
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DOI: https://doi.org/10.1007/s10509-015-2386-4