Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995yera.conf...29s&link_type=abstract
The XXVIIth Young European Radio Astronomers Conference, ed. D.A. Green and W. Steffen, in association with Cambridge University
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The plasma jets in active galactic nuclei propagate with velocities close to the speed of light through the interstellar medium of their host galaxies. These jets are supersonic and highly collimated. It is expected from theory and found from observations that the interaction between the two fluids causes instabilities. This is common on kpc scales. However, new observations show that as close as a few parsec from the central engine quasi-periodic oscillations of the jet ridge line take place in a number of jets. Such oscillations can result from precession of the jet, helical magnetic fields, or helical instabilities. Each of these processes presents characteristic observable properties. In the present paper the jet distortions found in the BL Lac object 1803+78 are interpreted as the result of helical Kelvin- Helmholtz instabilities. Based on this interpretation a model of the jet is presented and a limit to the angle between the jet axis and the line of sight of theta < 16 deg is derived.
Britzen Silke
Krichbaum Thomas P.
Steffen Will
Witzel Andreas
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