Density Perturbations Set Up by a Rotating Galactic Dipole

Details Density Perturbations Set Up by a Rotating Galactic Dipole Density Perturbations Set Up by a Rotating Galactic Dipole

Jan 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974ap%26ss..26..189w&link_type=abstract

Astrophysics and Space Science, Volume 26, Issue 1, pp.189-197

Astronomy and Astrophysics

Astrophysics

Scientific paper

The response of material to a rotating magnetic dipole, considered as primeaval, the axis of which liesin the galactic plane of a model galaxy, is examined. In the three cases of (2.1) gas gradient dominant; (2.2) magnetic pressure and gravity dominant; and (2.3) gas pressure, magnetic pressure and gravity dominant with viscosity neglected, the flow pattern is found to be always characterised by two streamers of high-velocity matter emerging in the plane of the galaxy. The accompanying density distribution suggests a ready analogy with spiral galaxies, especially of SBc and SBb type; the main implication of the hypothesis, however, is that galactic dipoles will inevitably set up density perturbations of a form suitable for the generation of spiral arms via the mechanism of density waves.

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