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

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997arep...41..586p&link_type=abstract

Astronomy Reports, Volume 41, Issue 5, September 1997, pp.586-593

Astronomy and Astrophysics

Astronomy

5

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 <= 26 pc, electron number density in the clouds 0.2-0.3 cm^-3, volume density of the clouds >= 1.1 X 10^5 pc^-3, and scale height of the cloud distribution above the Galactic plane ~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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