Structure and stability of a static galactic halo including cosmic ray and Alfven wave effects

Details Structure and stability of a static galactic halo including cosmic ray and Alfven wave effects Structure and stability of a static galactic halo including cosmic ray and Alfven wave effects

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241...62k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. 62-68.

Astronomy and Astrophysics

Astrophysics

8

Cosmic Rays, Galactic Structure, Halos, Magnetohydrodynamic Waves, Adiabatic Conditions, Astronomical Models, Gas Pressure, Intergalactic Media, Static Stability

Scientific paper

A static one-dimensional model of the halo is considered in which the weight of the plasma is hydrostatically supported against gravity by the combined pressures of the plasma, cosmic rays and Alfven waves. Analytic solutions are derived in the limiting cases of weak (kappa approaching infinity) and strong (kappa = 0) scattering, where kappa is a suitably averaged diffusion coefficient of the cosmic rays. A numerical scheme which solves the general problem, for finite kappa, shows that the system can essentially be described by the strong scattering limit in which the cosmic rays and Alfven waves play a dominant role, with the result that the plasma pressure at large distances from the galactic plane tends to a much larger value than the background intergalactic medium pressure. It is shown that such a static halo is unstable to overturning. These results lend support to the idea that such a halo cannot be stationary and that a steady outflow, or galactic wind, is to be expected.

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