Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424..126h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 1, p. 126-137
Astronomy and Astrophysics
Astronomy
43
Kelvin-Helmholtz Instability, Magnetohydrodynamic Flow, Radio Jets (Astronomy), Resonant Frequencies, Supersonic Jet Flow, Magnetohydrodynamics, Three Dimensional Flow, Three Dimensional Models
Scientific paper
Hydrodynamical simulations of the response of an expanding slab jet to different driving frequencies have been performed. Amplitude growth of the resulting sinusoidal jet oscillation occurs when the driving frequency is lower than the resonant frequency at which sinusoidal wave growth associated with the Kelvin-Helmholtz instability is a maximum,. In general, conditions leading to jet expansion result in the driving frequency being above the resonant frequency at some point along an expanding jet. At larger distances where the driving frequency is above the resonant frequency, growth ceases. If by this point sufficient amplitude growth of sinusoidal oscillations has not occurred, the jet is not decollimated. A consequence for astrophysical jets is that observed large-scale jet oscillation can be at wavelengths longer than to slightly less than the wavelength corresponding to the jet's lowest resonant frequency. This places an upper limit on a precessional frequency, orbital frequency, or random perturbation frequency at the central engine to which an astrophysical jet can helically respond at large scales. This result is applied to the radio source 3C 449 whose morphology suggests that orbital motion of the central engine is responsible for jet bending and an upper limit to the orbital frequency is obtained. Additionally, the observed trajectory of the southern jet along with information about the galaxy's atmosphere is used to estimate the orbital period and jet velocity.
Clarke David A.
Cooper Michael A.
Hardee Philip E.
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