Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..49....3h&link_type=abstract
Astrophysics and Space Science, vol. 49, no. 1, June 1977, p. 3-39. Research supported by the National Research Council of Cana
Astronomy and Astrophysics
Astrophysics
4
Astronomical Models, Galactic Evolution, Gravitational Collapse, Hubble Diagram, Interstellar Magnetic Fields, Magnetohydrodynamic Flow, Angular Momentum, Galactic Mass, Galactic Nuclei, Galactic Structure, Spiral Galaxies
Scientific paper
An attempt is made to show that magnetic fields of protogalaxies may be a factor in the formation and evolution of galaxies and might be an unknown initial parameter required to explain the Hubble sequence. Physical relations in a 'gravito-magnetic accretion vortex' are discussed, spiral MHD flow theory is reviewed, and a scenario is outlined for the formation of galaxies around 'nuclear seeds'. It is proposed that the variety of galactic types found on a given mass scale be interpreted in terms of the parameters B (magnetic-field strength), i (angle between magnetic field and rotation axis), L (total specific angular momentum), and E (total energy per unit mass); it is also suggested that the main Hubble sequence is actually a sequence in i. Thus, galactic morphology is considered as a result of the contraction of a gravitationally unstable ionized spherical cloud of galactic mass endowed with rotation and a magnetic field. A sequence is postulated whereby small values of i give rise to Sc galaxies, large values result in ellipticals, intermediate values produce the rest of the Hubble sequence, and subtypes arise due to variations in the ratio of magnetic-field strength to total specific angular momentum.
Henriksen Richard N.
Reinhardt Michael
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