Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...151..151s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 151, no. 1, Oct. 1985, p. 151-156.
Astronomy and Astrophysics
Astrophysics
24
Cosmic Rays, Gas Dynamics, Interstellar Gas, Interstellar Magnetic Fields, Diffusion Coefficient, Flow Velocity, Galactic Radiation, Gas Temperature, Magnetohydrodynamics, Radiation Pressure
Scientific paper
The dynamics of interstellar matter in highly flattened disk galaxies is considered. A new equation for the cosmic ray pressure is added to Maxwell's equation and to the well-known magnetohydrodynamic relations for mass, momentum and energy conservation for gravitating interstellar gas. The cosmic ray pressure equation is derived from the microscopic kinetic transport equation by introducing effective hydrodynamic parameters. A system of three coupled nonlinear differential equations results which relates the cosmic ray pressure, the galactic magnetic field, the effective cosmic ray diffusion coefficient, the interstellar gas density and temperature for any given gravitational field and cosmic ray source distribution.
Lerche Ian
Schlickeiser Reinhard
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