The development of Spiral Structure in a Galaxy; (Spanish Title: El desarrollo de la estructura espiral en una galaxia)

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galaxies: Kinematics And Dynamics, Galaxies: Spiral

Scientific paper

The main aim of this paper is to show that by postulating the existence of a rotating and shrinking gaseous bulge with a magnetic field as envisaged, and given a rotation curve, a galaxy will have produced and maintained spiral arms during a reasonably long time, which in the case of M31, chosen for illustration, is of the order of 3x10(9) years. We conclude that differential rotation of a galaxy may be the very agent that produces spiral structure.

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