A supershell model for the high- and intermediate-velocity neutral hydrogen clouds

Details A supershell model for the high- and intermediate-velocity neutral hydrogen clouds A supershell model for the high- and intermediate-velocity neutral hydrogen clouds

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..205v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 1, p. 205-233.

Astronomy and Astrophysics

Astrophysics

18

Astronomical Models, Gas Expansion, H I Regions, Molecular Clouds, Neutral Gases, Kinetic Energy, Milky Way Galaxy, Solar Neighborhood, Spatial Distribution

Scientific paper

The anomalous negative-velocity H I over the first and second quadrants of the Galactic longitude, especially in the Northern Hemisphere, has yet to be addressed by a model that successfully explains the properties of high-velocity clouds (HVCs) and intermediate-velocity cloud. Taking into account the influence of the radio continuum spur known as Loop III, parameters describing the supershell are derived through comparisons of model predictions with the latitude-velocity distributions of the HVCs in 5-deg longitude intervals. The agreement obtained between model results and Northern Hemisphere data indicates that the brightest HVCs result from column-density enhancements over a large depth in space.

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