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arXiv:astro-ph/0011451 (astro-ph)
[Submitted on 24 Nov 2000]

Title:Weakly nonlinear theory of the Jeans instability in disk galaxies of stars

Authors:Evgeny Griv (1), Michael Gedalin (1), David Eichler (1), Chi Yuan (2) ((1) Department of Physics, Ben-Gurion University of the Negev, Israel, (2) Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), Taiwan)
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Abstract: The reaction of collective oscillations excited in the interaction between aperiodically growing Jeans-type gravity perturbations and stars of a rapidly rotating disk of flat galaxies is considered. An equation is derived which describes the change in the main body of equilibrium distribution of stars in the framework of the nonresonant weakly nonlinear theory. Certain applications of the theory to the problem of relaxation of the Milky Way at radii where two-body relaxation is not effective are explored. The theory, as applied to the Solar neighborhood, accounts for observed features, such as the shape for the velocity ellipsoid of stars and the increase in star random velocities with age.
Comments: 6 pages, submitted to ApJ Letters
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0011451
  (or arXiv:astro-ph/0011451v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0011451

Submission history

From: Evgeny Griv [view email]
[v1] Fri, 24 Nov 2000 09:32:26 UTC (12 KB)
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