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On the distribution of interstellar gas in the galactic haloNew 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.
Document ID
19830035778
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hobbs, L. M.
(Yerkes Observatory Williams Bay, WI, United States)
Morgan, W. W.
(Yerkes Observatory Williams Bay, WI, United States)
Albert, C. E.
(Yerkes Observatory Williams Bay, WI, United States)
Lockman, F. J.
(National Radio Astronomy Observatory Charlottesville, VA, United States)
Date Acquired
August 11, 2013
Publication Date
December 15, 1982
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
83A16996
Funding Number(s)
CONTRACT_GRANT: NGR-14-001-147
CONTRACT_GRANT: NSF AST-80-07988
Distribution Limits
Public
Copyright
Other

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