Jet Collimation in Active Galactic Nuclei

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Scientific paper

Many quasars and active galactic nuclei 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. High percentages of polarization, indicates the nonthermal nature of the radiation which is well explained as the synchrotron radiation of the relativistic electrons in an ordered magnetic field. A strong collimation of jets is most probably connected with ordered magnetic fields. The mechanism of magnetic collimation, first suggested by Bisnovatyi-Kogan et al. (1969), was based on the initial charge separation, leading to creation of oscillating electrical current, which produces azimuthal magnetic field, preventing jet expansion and disappearance. Another type of magnetic collimation, connected with torsional oscillations of a cylinder with elongated magnetic field was considered by Bisnovatyi-Kogan (2007). Approximate simplified model reduces the problem to set of ordinary differential equation, which are solved numerically. That gives a possibility to estimate quantitatively the range of parameters where jets may be stabilized by torsional oscillations, showing chaotic behavior.

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