Magnetodynamical jets and flows in the interstellar and intergalactic space

Abstract

We claim in the present paper that the jets and flows in the interstellar and intergalactic space showing bipolarity may be due to the gravo-magnetodynamic process inherent to the condensation of the central object (+ accretion disk) from the primordial medium having a large scale magnetic field. The gravitational contraction of the gas squeezes the corresponding part of the large scale magnetic field to form an hourglass-shaped configuration, and the differentially rotating disk material produces the magnetic twists which relax out to the bipolar directions, bunching the large scale magnetic field by the “sweeping pinch” effect, and helical outflows are driven by the Lorentz force in the unwinding twist, collimated along the large scale magnetic field. Molecular bipolar flows and some other phenomena related to the newly formed stars are discussed as examples of these gravo-magnetodynamic phenomena of interstellar scale. After discussing the applicability of the model by the similarity arguments, we extend our discussion to the problem of intergalactic scale, and deal with the radio jets and lobes from active galactic nuclei.