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On the dynamical basis of the classification of normal galaxies.

Abstract：

: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.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Haass J,Bertin G,Lin CC

doi

10.1073/pnas.79.12.3908

subject

Has Abstract

pub_date

1982-06-01 00:00:00

pages

3908-12

issue

12

eissn

0027-8424

issn

1091-6490

journal_volume

79

pub_type

杂志文章

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