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The Role of Cosmic Rays and Alfvén Waves in the Structure of the Galactic Halo

  • M. K. Dougherty (a1) and J. F. Mckenzie (a2)

Abstract

The effect that cosmic rays and the Alfvén waves generated by them have on the structure of the plasma distribution perpendicular to the galactic disc in a hydrostatic model is examined. It is shown that the plasma distribution exhibits two length scales, essentially because the cosmic rays and Alfvén waves lift the gas up and stretch it out beyond the galactic plane. The predicted gas density far from the galactic plane indicates that models involving hydrostatic equilibrium should be replaced by those allowing for a galactic wind.

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Copyright

References

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Breitschwerdt, D., Völk, H. J. and McKenzie, J. F. (1987), ‘Cosmic Ray and Wave Driven Galactic Wind Solutions’, Proceedings of the 20′th Int. Cosmic Ray Conf. (Moscow) 2, 115118.
Dougherty, M. K. (1988), ‘Wave Particle Interactions in Anisotropic and Dispersive Media’, Ph.D Thesis, University of Natal, Durban, South Africa.
Ghosh, A. and Ptuskin, V. S. (1983), ‘The Role of Cosmic Rays in Hydrostatic Equilibrium of the Galactic Halo’, Astrophysics and Space Science 92, 3744.
Ginzburg, V. L. and Ptuskin, V. S. (1976), ‘On the origin of cosmic rays : Some problems in high-energy astrophysics’, Reviews of Modern Physics 48, 161189.
McKenzie, J. F., Breitschwerdt, D. and Völk, H. J. (1987), ‘Flux Tube Formulation of Galactic Wind Equations Including Cosmic Rays and Waves’, Proceedings of the 20′th Int. Cosmic Ray Conf. (Moscow) 2, 119122.
McKenzie, J. F. and Völk, H. J. (1982), ‘Non-linear Theory of Cosmic Ray Shocks Including Self-generated Alfvén Waves’, Astronomy and Astrophysics 116, 191200.

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