Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..126d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 10, 1991, p. 126-140.
Astronomy and Astrophysics
Astronomy
67
Galactic Structure, H I Regions, Interstellar Matter, Milky Way Galaxy, Neutral Gases, Radio Sources (Astronomy), Cylindrical Coordinates, Sky Surveys (Astronomy), Vertical Distribution
Scientific paper
The H I 21 cm emission-line survey data of Stark et al. (1991) have been used to study the distribution of H I in the outer Galaxy and to improve understanding of the various systematic problems which influence all studies of Galactic H I. For n(H) greater than 0.01/cu cm, the distributions are similar to those found by Burton and te Lintel Hekkert (1986) but are 'better behaved' at substantially lower values of n(H). The z distribution of gas in the H I layer is best described as complicated. The behavior of the gaseous matter is consistent with the observed distribution of H I found in external spiral galaxies. In the directions of the maximum warp the average distance of the gas away from the Galactic plane reaches about 4 kpc at R about 24 kpc, while the flaring of the layer as measured by z(rms) increases to about 3 kpc. In directions where the warp layers particularly well measured, the Galaxy is followed to R about 30 kpc. The surface density of the atomic gas decreases exponentially.
Diplas Athanassios
Savage Blair. D.
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