Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l..79v&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Jan. 15, 1979, p. L79-L83. Research supported by the University
Astronomy and Astrophysics
Astronomy
19
Astronomical Models, Brightness, Radio Galaxies, Radio Jets (Astronomy), Galactic Nuclei, Supermassive Stars, Thermal Plasmas
Scientific paper
The linearity and rather constant surface brightness of the jet in NGC 6251 over nearly all of its 200 kpc length and of the northern jet in 3C 31 out to 10 kpc have been interpreted as evidence for continuous energy and momentum transfer from the galactic nucleus to the outer radio lobe by an unconfined beam of relativistic plasma. This letter shows that the expected surface brightness of such a beam is entirely inconsistent with observations and that the bending of jets, which is observed in 3C 31 and may be present in NGC 6251, further contradicts the simple beam model. A slingshot model is proposed wherein the jets are identified as plasma trails of supermassive objects that have been ejected from the galactic nucleus and have subsequently fallen back and become recaptured by the nucleus. This model associates the curvature of jets with deviations from straight-line orbits due to gravitational perturbations by companion galaxies. The shape and brightness distribution of such a jet in a plausible model galaxy are calculated and found to agree very well with the observations.
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