Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..165a&link_type=abstract
Astronomy and Astrophysics, Vol. 274, p. 165 (1993)
Astronomy and Astrophysics
Astrophysics
11
Pair Plasma, Beams, Alfvén Waves, Whistler Waves, Compact Jets, Extragalactic Sources
Scientific paper
The instability of relativistic electron-positron beams, frequently discussed as a component of extragalactic jets, against the excitation of electromagnetic waves moving along a common axis of beam and magnetic field is examined. It is found that at a given beam Lorentz factor the answer to this question depends on the ratio of the electron plasma- and gyrofrequency of the background plasma, through which the beam propagates, and its temperature. At low values of the ratio ωpe/|Ωe| the beam is not disturbed by the excitation of transversal parallel waves. This situation would prevail near the nucleus of an active galaxy. At intermediate values the positron component becomes unstable leading to the formation of transient currents and possibly also plasma double layers the consequences of which on current formation and particle acceleration are not yet clear. Only at very large ratios depending on the plasma temperature also the electron component is destabilized so that even without electrostatic instabilities a beam could not propagate to arbitrarily large distances from the nucleus.
Achatz Ulrich
Schlickeiser Reinhard
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