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Fractal Properties of Extragalactic Jets: Evidence of Turbulence?

  • G. Bodo (a1) (a2) (a3), S. Massaglia (a1) (a2) (a3), L. Feretti (a1) (a2) (a3), A. Ferrari (a1) (a2) (a3) and D. Dall'Anese (a1) (a2) (a3)...

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Several different properties of extragalactic radio sources have been attributed to the effects of turbulence. The morphological appearance of FRI sources has been often interpreted as the result of turbulent entrainment in subsonic or transonic flows (Bicknell 1984, 1986). Moreover, particle acceleration by MHD turbulence via a second order Fermi process is one of the possible ways for accelerating the synchrotron emitting relativistic particles (see Ferrari, Trussoni & Zaninetti 1979). Turbulence appears therefore as an important ingredient in the theoretical modelling of extragalactic radio sources; however, we do not have, unfortunately, any direct evidence of it.

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References

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Bicknell, G.V. (1984) ApJ , 286, 68
Bicknell, G.V. (1986) ApJ , 300, 591
Ferrari, A., Trussoni, E., Zaninetti, L. (1979) A&A , 79, 190

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