Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191..167a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 1, Feb. 1988, p. 167-180.
Astronomy and Astrophysics
Astronomy
5
Electromagnetic Interactions, Extragalactic Radio Sources, Magnetohydrodynamics, Radio Jets (Astronomy), Current Density, Lorentz Force, Magnetic Fields, Morphology, Reynolds Number
Scientific paper
The hydrodynamic and electromagnetic interaction between two jets is discussed in the firehose limit, where the jets move with undistorted crossections. The results are applied to the radio jets of the radio galaxy 3C 75. It is shown that the observed large scale morphology of the source can be explained by two models. In the first, current-carrying jets interact electromagnetically. When the jet material is very light with respect to the surrounding medium, instabilities which tend to destroy the topology of the interacting jets are slow enough that the observed pattern persists through the lifetime of the source. In the second model, the jets interact hydrodynamically when one jet traverses the wake of the other in the cross-flow due to the motion of the parent galaxies. Again, the jets have to be very light with respect to the surrounding medium so that the hydrodynamical lift- and drag forces are strong enough to cause the observed wiggles.
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