Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242...85k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 1, Feb. 1991, p. 85-92.
Astronomy and Astrophysics
Astrophysics
6
Astronomical Models, Cosmic Rays, Halos, Magnetohydrodynamic Waves, Thermal Plasmas, Diffusion Coefficient, Gravitational Fields, Magnetic Field Configurations, Radiant Flux Density, Reference Atmospheres
Scientific paper
The structure and stability of static galactic halo is considered in a three-fluid hydrodynamic model which consists of a thermal plasma, cosmic rays, and Alfven waves. The interactions between the components are treated self-consistently. Under suitable assumptions for the cosmic ray diffusion coefficient and the magnetic field configuration, the model can essentially be reduced to a one-dimensional problem along the magnetic flux tube. In the strong scattering limit, the cosmic rays are strongly coupled to the plasma and the halo extends to large distances. The halo is then supported mainly by the cosmic rays and the excited Alfven waves. Stability analysis shows that the static halo is susceptible to overturning instabilities in many situations. When the Galaxy is taken as an example, it is found that the pressure at large distances is more than three orders of magnitude larger than the intergalactic medium pressure, and that the halo is unstable with a growth time less than 2 x 10 to the 7th yr. Hence, a dynamic halo model is needed.
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