Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ap%26ss..68..393q&link_type=abstract
Astrophysics and Space Science, vol. 68, no. 2, Apr. 1980, p. 393-422. Research supported by the Fundacao de Amparo a Pesquisa
Astronomy and Astrophysics
Astrophysics
3
Cosmic Dust, Density Distribution, Hydrogen, Interstellar Gas, Milky Way Galaxy, Cosmic Rays, Free Electrons, Interstellar Magnetic Fields, Line Spectra, Magnetic Flux, Star Distribution
Scientific paper
Calculations of the density distributions of the two main components of interstellar hydrogen show that the narrow, dense component (state I of neutral hydrogen) has a Gaussian z-distribution with a scale height of 50 pc in the local zones; for the wide, tenuous component (hydrogen in state II), a specified distribution is postulated. A minimum and maximum Kz-force are obtained, and the effects of wavelike distributions of matter in the z-coordinate are analyzed in relation to the Kz-force. The mass density obtained in the galactic plane is 0.20 plus or minus 0.05 solar masses per cubic pc. Attention is given to the gas to dust ratio, as well as to the ratio between the observed dispersions in neutral hydrogen (thermal width plus turbulence) and the total dispersions corresponding to the real inner energies in the medium.
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