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Title:
Galactic hydrostatic equilibrium with magnetic tension and cosmic-ray diffusion
Authors:
Boulares, Ahmed; Cox, Donald P.
Affiliation:
AA(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AB(Wisconsin, University, Madison)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. 544-558. (ApJ Homepage)
Publication Date:
12/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cosmic Rays, Interstellar Gas, Interstellar Magnetic Fields, Milky Way Galaxy, Particle Acceleration, Solar Neighborhood, Gaseous Diffusion, Gravitational Fields, Hydrostatics, Mass Distribution, Pressure Distribution
DOI:
10.1086/169509
Bibliographic Code:
1990ApJ...365..544B

Abstract

Three gravitational potentials differing in the content of dark matter in the Galactic plane are used to study the structure of the z-distribution of mass and pressure in the solar neighborhood. A P(0) of roughly (3.9 + or - 0.6) x 10 to the -12th dyn/sq cm is obtained, with roughly equal contributions from magnetic field, cosmic ray, and kinetic terms. This boundary condition restricts both the magnitude of gravity and the high z-pressure. It favors lower gravity and higher values for the cosmic ray, magnetic field, and probably the kinetic pressures than have been popular in the past. Inclusion of the warm H(+) distribution carries a significant mass component into the z about 1 kpc regime.

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