Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..833h&link_type=abstract
Astrophysical Journal, Part 1, vol. 235, Feb. 1, 1980, p. 833-839.
Astronomy and Astrophysics
Astronomy
52
Absorption Spectra, Hydrogen Clouds, Interstellar Gas, Milky Way Galaxy, Centimeter Waves, Emission Spectra, Line Spectra, Normal Density Functions, Radio Sources (Astronomy), Spatial Distribution, Ubv Spectra
Scientific paper
The pervasiveness of the 'not strongly absorbing' (NSA) H I gas, which is the intercloud medium in steady state theories of the interstellar medium, is considered. Wide emission components in nearby gas, and the absence of absorption components in distant gas, are analyzed. It is concluded that the NSA material is deficient in the immediately local solar vicinity. In nearby regions it contains 38% of the interstellar H I; it is generally pervasive and often has internal motions which greatly increase its velocity dispersion above the 5 km/s minimum value. It contains large holes, perhaps ranging up to 400 pc diameter, which probably occupy 10-20% of the volume. In distant regions the NSA material seems to be pervasive outside 8 kpc galactic radius, and for galactic radii between 8 and 10 kpc its thickness agrees with previous determinations of 370 pc for nearby regions. Outside 10 kpc the thickness increases dramatically; inside 8 kpc there are no data.
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