On the Dynamical Basis of the Classification of Normal Galaxies

Details On the Dynamical Basis of the Classification of Normal Galaxies On the Dynamical Basis of the Classification of Normal Galaxies

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pnas...79.3908h&link_type=abstract

Proceedings of the National Academy of Sciences of the United States of America, Volume 79, Issue 12, pp. 3908-3912

Mathematics

Logic

13

Scientific paper

Some realistic galaxy models have been found to support discrete unstable spiral modes. Here, through the study of the relevant physical mechanisms and an extensive numerical investigation of the properties of the dominant modes in a wide class of galactic equilibria, we show how spiral structures are excited with different morphological features, depending on the properties of the equilibrium model. We identify the basic dynamical parameters and mechanisms and compare the resulting morphology of spiral modes with the actual classification of galaxies. The present study suggests a dynamical basis for the transition among various types and subclasses of normal and barred spiral galaxies.

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