Distribution of turbulent interstellar plasma in the Galaxy

Details Distribution of turbulent interstellar plasma in the Galaxy Distribution of turbulent interstellar plasma in the Galaxy

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997azh....74..663p&link_type=abstract

Astronomicheskij Zhurnal, vol. 74, p. 663

Astronomy and Astrophysics

Astronomy

10

Milky Way Galaxy, Interstellar Matter, Plasma Turbulence, Plasma Dynamics, Statistical Distributions, Electron Density (Concentration), Plasma Clouds, Power Spectra, Neutral Gases

Scientific paper

It is shown that the turbulent interstellar plasma outside the spiral arms of the Galaxy has a statistically uniform distribution. The following parameters are obtained for this medium: cloud size not greater than 26 pc, electron number density in the clouds 0.2-0.3/cu cm, volume density of the clouds not less than 1.1 x 10 exp -5/cu pc, and scale height of the cloud distribution above the Galactic plane approximately equal to 0.9 kpc. Possible sources of ionization for these clouds are discussed, and it is shown that B and A stars do not play a significant role in this ionization. It is proposed that the outer envelopes of a substantial fraction of the clouds are ionized by shock waves created during the supersonic motion of cold clouds of neutral hydrogen in a medium consisting of lower-density neutral gas.

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