The missing intercloud medium and spiral galaxies

Details The missing intercloud medium and spiral galaxies The missing intercloud medium and spiral galaxies

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.265..123s&link_type=abstract

Nature, vol. 265, Jan. 13, 1977, p. 123, 124.

Physics

14

Galactic Structure, Interstellar Gas, Spiral Galaxies, Absorption Spectra, Galactic Evolution, Gas Density, Gas Temperature, Milky Way Galaxy, Supernovae

Scientific paper

Doubt is expressed on the existence of the intercloud medium (in the state usually quoted), with several independent lines of evidence invoked. Arguments pro preponderance of an intercloud medium in the solar vicinity (within 1 kpc) are reviewed in outline, and an estimate of the likelihood of Phase III gas (particle density below 0.01 per cu cm, temperature about one million K, interstellar medium with embedded cooler clouds and circumstellar shells) is ventured. Spiral galaxies with Phase III interstellar gas permeating both arm and interarm regions are considered uncommon or unlikely, but the likelihood of Phase III gas near spiral arms only (site of occurrence of most supernovae) is allowed. A cyclic process accounting for Phase III conditions in a galaxy's history is elaborated, and verifying conditions are stated.

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