Fine-scale structure of a cold hydrogen layer

Details Fine-scale structure of a cold hydrogen layer Fine-scale structure of a cold hydrogen layer

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...194l.109b&link_type=abstract

Astrophysical Journal, vol. 194, Dec. 1, 1974, pt. 2, p. L109, L110.

Astronomy and Astrophysics

Astronomy

2

Absorption Spectra, Cold Gas, Fine Structure, Hydrogen Clouds, Interstellar Gas, Radio Sources (Astronomy), Continuous Radiation, Line Spectra, Microwave Interferometers, Optical Thickness

Scientific paper

Neutral-hydrogen absorption-line interferometer observations are reported for five continuum radio sources situated behind an extensive layer of cold interstellar H I gas. In contrast to low-spatial-resolution emission-line observations reported earlier which show the large-scale uniformity of the layer, the high-spatial-resolution absorption-line observations reveal variations in the velocity and density within the layer. The new results together with the old indicate the apparent coexistence of a large-scale mechanism for triggering the formation of cold hydrogen and an instability mechanism leading to small-scale irregularities.

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