Magnetogasdynamic mechanism for rotation of galaxies with spiral structure

Details Magnetogasdynamic mechanism for rotation of galaxies with spiral structure Magnetogasdynamic mechanism for rotation of galaxies with spiral structure

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977afz....13...79k&link_type=abstract

Astrofizika, vol. 13, Feb. 1977, p. 79-94. In Russian.

Astronomy and Astrophysics

Astronomy

Galactic Rotation, Magnetohydrodynamics, Spiral Galaxies, Angular Velocity, Astronomical Models, Galactic Nuclei, Shock Wave Propagation, Steady State, Supersonic Flow, Torque

Scientific paper

A magnetogasdynamic approach to the problem of spiral-galaxy rotation is developed on the basis of observational data concerning the longitudinal magnetization of spiral arms and recurrent supersonic gas ejection from central regions. The rotation mechanism (a 'Segner' mechanism) involves torque transfer to a spiral arm during shock-wave passage along a magnetized spiral with decreasing density and the subsequent impact ejection of gas masses from the end of the arm into space. It is shown that this mechanism can maintain the observed rotational velocity of spirals for several billion years and leads to steady-state rotation. The period of the rotation so established is found to be proportional to the radius of the galaxy concerned.

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