Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986cajph..64..490m&link_type=abstract
(Conference on Jets from Stars and Galaxies, Toronto, Canada, June 24-27, 1985) Canadian Journal of Physics (ISSN 0008-4204), vo
Astronomy and Astrophysics
Astronomy
2
Astronomical Models, Magnetohydrodynamic Flow, Radio Galaxies, Radio Jets (Astronomy), Equations Of Motion, Hypersonic Flow
Scientific paper
Hercules A is an unusual radio source in that its structure is dominated (most specifically on the western side of the source) by an undulating chain of discrete 'rings' of radio emission, whose individual radii increase progressively with distance from the nuclear core while their apparent separation decreases. In the theoretical model presented here, these interesting radio features are presumed to be due to emission from a discrete set of ram-pressure confined plamoids that have been periodically ejected by a precessing nuclear engine. The predicted deceleration and expansion of these ram-pressure confined plasmoids provides an excellent fit to the observed spacing and radii of the radio rings observed on the western side of Hercules A. Furthermore, a satisfactory fit to the morphology of the undulating eastern jet can also be achieved using this discrete ejection model, providing the eastward ejections alternate with the westward ejections, thus implying a form of flip-flop behavior for this particular source.
Christiansen Wayne A.
Maiden M. E.
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