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Fractal Properties of Extragalactic Jets: Evidence of Turbulence?

Published online by Cambridge University Press:  25 May 2016

G. Bodo ,
S. Massaglia ,
L. Feretti ,
A. Ferrari  and
D. Dall'Anese
G. Bodo
Affiliation:
Osservatorio Astronomico di Torino Strada dell'Osservatorio 20, 10025 Pino Torinese, Italy Istituto di Radioastronomia del CNR Via Gobetti 101, I-40129 Bologna, Italy Dipartimento di Fisica Generale, Università di Torino Via P. Giuria 1, I-10125 Torino, Italy
S. Massaglia
Affiliation:
Osservatorio Astronomico di Torino Strada dell'Osservatorio 20, 10025 Pino Torinese, Italy Istituto di Radioastronomia del CNR Via Gobetti 101, I-40129 Bologna, Italy Dipartimento di Fisica Generale, Università di Torino Via P. Giuria 1, I-10125 Torino, Italy
L. Feretti
Affiliation:
Osservatorio Astronomico di Torino Strada dell'Osservatorio 20, 10025 Pino Torinese, Italy Istituto di Radioastronomia del CNR Via Gobetti 101, I-40129 Bologna, Italy Dipartimento di Fisica Generale, Università di Torino Via P. Giuria 1, I-10125 Torino, Italy
A. Ferrari
Affiliation:
Osservatorio Astronomico di Torino Strada dell'Osservatorio 20, 10025 Pino Torinese, Italy Istituto di Radioastronomia del CNR Via Gobetti 101, I-40129 Bologna, Italy Dipartimento di Fisica Generale, Università di Torino Via P. Giuria 1, I-10125 Torino, Italy
D. Dall'Anese
Affiliation:
Osservatorio Astronomico di Torino Strada dell'Osservatorio 20, 10025 Pino Torinese, Italy Istituto di Radioastronomia del CNR Via Gobetti 101, I-40129 Bologna, Italy Dipartimento di Fisica Generale, Università di Torino Via P. Giuria 1, I-10125 Torino, Italy

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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.

Type
Radio Source Modelling and Emission Mechanisms
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 463 - 464
Copyright
Copyright © Kluwer 1996 

References

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