Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....35..361k&link_type=abstract
Astronomy and Astrophysics, vol. 35, no. 3, Oct. 1974, p. 361-379.
Astronomy and Astrophysics
Astrophysics
115
Cosmic Dust, Galactic Structure, Globular Clusters, H Lines, Interstellar Extinction, Interstellar Gas, Emission Spectra, Hydrogen, Line Shape, Milky Way Galaxy, Tables (Data), Ubv Spectra
Scientific paper
The 21-cm line profiles from hydrogen in the directions of 81 galactic globular clusters were observed with the National Radio Astronomy Observatory 140-foot telescope. Good correlation, independent of latitude, exists between H I column density and the dust column density (measured by the reddening of globular clusters) in the Galaxy. The mean relationship between gas and reddening is consistent with a gas-to-dust ratio on the order of 100:1 by mass. A relative excess of reddening in some directions at low galactic latitudes is due to saturation of the H I line emission and the formation of binary molecular hydrogen in discrete dust clouds along the line of sight. Derivation of galactic absorption from galaxy counts is shown to give erroneous answers.
Kerr Frank J.
Knapp Gillan R.
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