48 research outputs found
Jet confinement by magneto-torsional oscillations
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.Comment: accepted for publication in Astrophysics and Space Scienc
Concluding Remarks
Short comments to the conference talks