Abstract
A sudden injection of relativistic electrons at the centre of an extended dipolar magnetic field could lead to an apparent faster-than-light expansion of two synchrotron emitting regions. Subsequent injections of electrons would produce components which move outwards along the same axis.
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Sanders, R. Super-relativistic phase velocities of radio source components. Nature 248, 390–392 (1974). https://doi.org/10.1038/248390a0
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DOI: https://doi.org/10.1038/248390a0
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