On the distribution of interstellar gas in the galactic halo

Details On the distribution of interstellar gas in the galactic halo On the distribution of interstellar gas in the galactic halo

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263..690h&link_type=abstract

Astrophysical Journal, Part 1, vol. 263, Dec. 15, 1982, p. 690-695.

Astronomy and Astrophysics

Astrophysics

40

Interstellar Gas, Line Spectra, Lyman Alpha Radiation, Neutral Gases, Stellar Spectrophotometry, Absorption Spectra, B Stars, Emission Spectra, O Stars, Stellar Spectra, Ultraviolet Spectra

Scientific paper

New and existing observations of 21-cm emission lines toward 10 distant, high-latitude OB stars are combined with existing observations of interstellar Lyman-alpha absorption lines, in order to determine the ratio, N21/N-alpha, of the two different column densities of H I. This ratio, which is related to the fraction of the cool, neutral gas in the halo that lies beyond each star, decreases smoothly to about unity with increasing distance from the galactic plane. The column density of neutral gas beyond about 1 kpc can be as much as one-third of the total above the plane, but only relatively small amounts of such gas lie more than 2 kpc from the plane. The distances to, and the possible birthplaces of, these Population I stars in the halo are discussed.

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