Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311..518h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 15, 1986, p. 518-525.
Astronomy and Astrophysics
Astrophysics
31
Astronomical Models, Cosmic Rays, Galactic Structure, Gas Density, Proton Energy, Static Models, Density Distribution, Diffusion Coefficient, Milky Way Galaxy, Proton Density (Concentration)
Scientific paper
The distributions of gas density and of cosmic-ray proton energy density are calculated for a static cosmic-ray-supported gaseous halo. The transport equation used for the cosmic rays includes convection at the Alfven speed, diffusion, and losses due to wave generation by the cosmic-ray streaming. The wave amplitudes are used to determine the diffusion coefficient used in the cosmic-ray transport equation. The requirement that the cosmic-ray energy flux out of the disk equals the energy production rate per unit area of the disk is not inconsistent with the gas number density at the halo base being about 0.001/cu cm, as required by photoionization models for the production of the C IV and Si IV features observed in the halo gas. The sensitivity of the halo density to the various local galactic parameters is discussed. The implications of recent gamma-ray observations for the model are considered.
Hartquist Thomas W.
Morfill Gregor E.
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