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| Paper: |
The Distribution of Disk-Halo H I Clouds in the Inner Milky Way |
| Volume: |
438, The Dynamic Interstellar Medium: A Celebration of the Canadian Galactic Plane Survey |
| Page: |
163 |
| Authors: |
Ford, H. A.; Lockman, F. J.; McClure-Griffiths, N. M. |
| Abstract: |
Using data from the Galactic All-Sky Survey, we have compared the properties and
distribution of H I clouds in the disk-halo transition at the tangent points in mirror-symmetric
regions of the first quadrant (QI) and fourth quadrant (QIV) of the Milky Way.
Individual clouds are found to have identical properties in the two quadrants.
However, there are three times as many clouds in QI as in QIV, their scale height is twice as large, and their
radial distribution is more uniform. We attribute
these major asymmetries to the formation of the clouds in the spiral arms of the Galaxy, and suggest
that the clouds are related to star formation in the form of gas that has been lifted from the disk by
superbubbles and stellar feedback, and fragments of shells that are falling back to the plane. |
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