Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esasp.311..207a&link_type=abstract
In ESA, Plasma Astrophysics p 207-213 (SEE N91-15046 06-90)
Astronomy and Astrophysics
Astronomy
1
Active Galactic Nuclei, Electrostatic Waves, Plasma Interactions, Plasma Turbulence, Radio Jets (Astronomy), Radio Observation, Magnetic Fields, Mathematical Models, Nonlinearity, Plasma Jets, Plasmas (Physics), Very Long Base Interferometry
Scientific paper
The physics of beam plasma interaction is investigated in the astrophysical context of jets issued from active galactic nuclei. In this physical situation, the magnetic field plays a significant role and strong Langmuir turbulence develops. This turbulence gives rise to Langmuir solitons which are found to be stable to transverse perturbations if the magnetic field is very strong, whereas they are unstable and collapse if the magnetic field is weak. When collapse occurs, the beam relaxes in the surrounding plasma and it is possible to estimate the power lost by the beam and its relaxation length. The consequences of this analysis for astrophysical jets show that one can associate radio knots observed in several sources and the transition region between relativistic jets, observed on the parsec scale close to the active galactic nuclei, and the classical jet, observed farther on the parsec scale.
Asseo Estelle
Pelletier Guy
Sol Hé&Lgrave
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