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Astrophysics and Space Science

, Volume 30, Issue 1, pp 149–161 | Cite as

Spiral structure and hydrodynamic gravitational resonance

  • R. Simon
Article
  • 38 Downloads

Abstract

A persistent and large scale galactic spiral structure might be the result of resonant excitation of density waves, forced in the low viscosity interstellar gas, by the gravitational field of an asymmetric stellar structure (galactic nucleus, condensation, companion galaxy, etc.) rotating like a rigid body around the galactic centre.

This paper deals with this problem in the simple case of a homogeneous plane viscous medium of infinite extent, in a state of rigid body rotation. Numerical estimates are given in the case of density waves excited by the gravitational field of a central dumb-bell. They show that the mechanism of hydrodynamic gravitational resonance is worthy of a further, more realistic, treatment.

Keywords

Viscosity Rigid Body Gravitational Field Numerical Estimate Density Wave 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1974

Authors and Affiliations

  • R. Simon
    • 1
  1. 1.Institut d'Astrophysique de l'Université de LiègeCointe-OugreéBelgium

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