The persistent problem of spiral galaxies

Details The persistent problem of spiral galaxies The persistent problem of spiral galaxies

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986itps...14..748a&link_type=abstract

IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. PS-14, Dec. 1986, p. 748-762.

Astronomy and Astrophysics

Astrophysics

13

Density Wave Model, Galactic Structure, Interstellar Magnetic Fields, Rotating Plasmas, Spiral Galaxies, Galactic Nuclei, Galactic Rotation, Interstellar Matter, Missing Mass (Astrophysics), Star Formation

Scientific paper

In contradiction to the assumed density wave mechanism for spiral galaxies, it is suggested that the magnetic fields and rotational velocity characteristics of spiral arms are best explained by ejections of material, including plasma, from which the spiral arm stars are formed. The model does not require spiral arms to be in rotation only under the pull of gravitational forces, and it explains how magnetic fields arise in the outer regions of spirals. In the ejection theory, the arms could rotate faster than the underlying disk throughout the galaxy, leading to reduced values of spiral galaxy masses, and diminishing the problem of missing mass.

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