On the global density waves in self-gravitating flat disks

Ambastha, A. ; Varma, R. K. (1983) On the global density waves in self-gravitating flat disks The Astrophysical Journal, 264 (1). pp. 413-426. ISSN 0004-637X

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Official URL: http://adsabs.harvard.edu/abs/1983ApJ...264..413A


The problem of global stability and structure of a class of disk models, both cold and "warm", against axisymmetric and nonaxisymmetric perturbations has been reconsidered in the form of an eigenvalue problem involving a triply infinite matrix. Some large wavelength (or open), nonaxisymmetric modes are found to stabilize in centrally concentrated disks. Unstable "leading" modes of cold disks become, gradually, "trailing" as the thermal energy of the disk is increased. The growth rates of short wavelength modes are lowered significantly by pressure effects in warm disks.

Item Type:Article
Source:Copyright of this article belongs to American Astronomical Society.
Keywords:Density Wave Model; Disk Galaxies; Eigenvalues; Perturbation Theory; Spiral Galaxies; Bessel Functions; Equations Of State; Galactic Rotation; Hydrodynamic Equations; Hydrodynamics; Thermal Energy
ID Code:58380
Deposited On:31 Aug 2011 06:14
Last Modified:18 May 2016 09:23

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