Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..635p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Feb. 15, 1992, p. 635-646.
Astronomy and Astrophysics
Astronomy
37
Active Galactic Nuclei, Energetic Particles, Particle Beams, Quasars, Accretion Disks, Light Speed, Relativistic Particles, Very Long Base Interferometry
Scientific paper
Attention is given to recent developments of a two-flow model for extragalactic jets, with emphasis on the possibility of ascribing VLBI jet features and superluminal motion to beams of relativistic particles streaming through an ambient plasma such as a wind from the accretion disk. It is shown that stability of the beams relative to the excitation of Langmuir and Alfvenic waves can be ensured in the case of electron-positron beams with bulk Lorentz factor gamma smaller than 43 as long as the magnetic field parallel to the beams and jets is larger than a critical value of 0.0032 sq rt np, where np is the density of the ambient plasma. Conversely, both electron-positron beams with higher bulk Lorentz factor and electron-proton beams are rapidly destroyed. It is proposed that electron-positron beams with gamma not more than 43 are responsible for VLBI features.
Pelletier Guy
Sol Hé&Lgrave
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