Abstract
This article summarizes the panel discussion on “Phases of the Interstellar Medium”. The panelists were asked to identify key issues related to the structure of the ISM, and the audience participated in a two-hour discussion. Beginning with a summmary of the physics of thermal phases, I provide some background on the observations and theories of 2-phase and 3-phase models. While the 3-phase model has had many successes, several recent observations disagree with its predictions. The major unresolved issue is whether the model can be “fixed” by tinkering with cloud geometries and supernova rates and by including a galactic fountain. The Milky Way supernova rate may have been overestimated, many supernovae may be less than 1051 ergs, and modelers have probably neglected important physics in mass transport, cloud formation and halo input.
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Shull, J.M. (1987). Panel Discussion: Phases of the Interstellar Medium. In: Hollenbach, D.J., Thronson, H.A. (eds) Interstellar Processes. Astrophysics and Space Science Library, vol 134. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3861-8_10
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DOI: https://doi.org/10.1007/978-94-009-3861-8_10
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