On the global density waves in self-gravitating flat disks

Details On the global density waves in self-gravitating flat disks On the global density waves in self-gravitating flat disks

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..413a&link_type=abstract

Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 413-426.

Astronomy and Astrophysics

Astrophysics

7

Density Wave Model, Disk Galaxies, Eigenvalues, Perturbation Theory, Spiral Galaxies, Bessel Functions, Equations Of State, Galactic Rotation, Hydrodynamic Equations, Hydrodynamics, Thermal Energy

Scientific paper

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.

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