II. Spiral Arms as Sheared Gravitational Instabilities

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ID: 302667
1965
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Abstract
This paper treats examples of gravitational instability in differentially rotating media. The particular cases dealt with include polytropic, stratified sheets of gas, as well as the infinite homogeneous media. Application of the results is made to the formation of spiral arms in a differentially rotating disk galaxy. Relations are derived which connect the thickness of the galactic disk, its density, and the velocity dispersion perpendicular to the galactic plane with Oort's differential rotation parameters A and B . Sections 1 and 2 discuss requirements of any theory of spiral arms. Sections 3 to 8 give a mathematical treatment of gravitational instability in a sheared rotating stratified medium. Section 9 discusses these results qualitatively and proposes a theory of spiral arm formation based on them. Section 10 gives the observational tests and consequences of the theory. Finally Section 11 gives a very brief discussion of barred spirals and points to the many problems left unsolved by the present work.
Reference Key
openalex_W1985873501 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Peter Goldreich, D. Lynden–Bell
Journal monthly notices of the royal astronomical society
Year 1965
DOI
10.1093/mnras/130.2.125
URL
https://academic.oup.com/mnras/article-pdf/130/2/125/8072031/mnras130-0125.pdf
Keywords Keywords not found

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