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Oblique Shocks in Extragalactic Jets

Published online by Cambridge University Press:  19 July 2016

D. Fraix-Burnet
D. Fraix-Burnet*
Affiliation:
Observatoire Midi-Pyrénées 14 Avenue Edouard Belin 31400 Toulouse France

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In the framework of the diffusive shock acceleration of relativistic electrons in extragalactic jets, we show that it is possible to derive the speed of the jet. For this purpose, we transform continuity relations through an oblique shock front into the reference frame of the observer. We apply these calculations to knot A of the M87 jet. Measuring the deviation of the fluid through the shock front from high-resolution radio maps and the deviation of the magnetic field from optical polarization maps (Fraix-Burnet et al., 1989), we derive speeds of about 0.01 c (Fraix-Burnet and Biermann, in preparation). The compression ratio is most probably 4 and the magnetic field is nearly parallel to the shock front both upstream and downstream.

Type
8. The Role of Magnetic Fields in Radio Source Jets and Extended Radio Lobes
Information
Symposium - International Astronomical Union , Volume 140: Galactic and Intergalactic Magnetic Fields , 1990 , pp. 437
Copyright
Copyright © Kluwer 1990 

References

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