Observations and Modeling of the Disk-Halo Interaction in our Galaxy

Details Observations and Modeling of the Disk-Halo Interaction in our Galaxy Observations and Modeling of the Disk-Halo Interaction in our Galaxy

1998-11-15

arxiv.org/abs/astro-ph/9811238v1

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures, invited contribution to appear in the proceedings of "New Perspectives on the Interstellar Medium"

Scientific paper

Galaxies are surrounded by large halos of hot gas which must be replenished as the gas cools. This led Norman & Ikeuchi (1989) to propose the chimney model of the interstellar medium, which predicts that there should be on the order of a thousand such conduits connecting the disk and the halo of a galaxy. Where then are these structures and other possible disk-halo connections in our galaxy? What do they look like, how can we detect them, and what do they tell us about the interstellar medium and about the Galaxy? We present a review of the observational evidence for Galactic disk-halo connections, beginning with large scale searches and then concentrating on the characteristics of selected candidates. We summarize how modeling these structures can provide information on the structure of the interstellar medium in which they evolved, focusing on the W4 superbubble and the Anchor as illustrations.

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