Jet confinement by magneto-torsional oscillations |
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| Authors: | Gennady Bisnovatyi-Kogan |
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| Institution: | (1) Space Research Institute, Profsoyuznaya 84/32, Moscow, 117997, Russia |
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| Abstract: | Many quasars and active galactic nuclei (AGN) appear in radio, optical, and X-ray maps, as a bright nuclear sources from which
emerge single or double long, thin jets. When observed with high angular resolution these jets show structure with bright
knots separated by relatively dark regions. Nonthermal nature of a jet radiation is well explained as the synchrotron radiation
of the relativistic electrons in an ordered magnetic field. We consider magnetic collimation, connected with torsional oscillations
of a cylinder with elongated magnetic field, and periodically distributed initial rotation around the cylinder axis. The stabilizing
azimuthal magnetic field is created here by torsional oscillations, where charge separation is not necessary. Approximate
simplified model is developed. Ordinary differential equation is derived, and solved numerically, what gives a possibility
to estimate quantitatively the range of parameters where jets may be stabilized by torsional oscillations. |
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| Keywords: | Magnetic fields Galaxies: jets |
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