Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322..694b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 15, 1987, p. 694-705.
Astronomy and Astrophysics
Astrophysics
76
Galactic Structure, Interstellar Magnetic Fields, Interstellar Matter, Magnetohydrodynamic Stability, Magnetohydrostatics, Absorption Spectra, Galactic Cosmic Rays, Halos, Interstellar Gas, Iue
Scientific paper
Using a variety of observations, it is shown that the gaseous, magnetic field, and cosmic-ray components in the local region of the Galaxy may be in a large-scale hydrostatic equilibrium that is stable against Parker type instabilities. Such an equilibrium sets limits on the characteristics of the gaseous halo. The density of the base of the halo is found to be approximately given by (0.15 - 0.3)(hhalo/kpc)-2cm-3, where hhalo is the exponential scale height which is argued to be ⪆5 kpc. The halo gas has to be hot in a stable equilibrium; typically ≡106K in the galactic plane and beyond a few kpc from the plane, but could be only about (2 - 3)×105K at z ≈ 1 - 3 kpc.
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