Modern view of the warm ionized medium
A. S. Hill, R. J. Reynolds, L. M. Haffner, K. Wood, G. J. Madsen
TL;DR
This paper reviews the warm ionized medium (WIM) as a significant and distinct component of the Milky Way's interstellar medium, emphasizing observational evidence and addressing scattering light models.
Contribution
It provides a comprehensive review of the WIM's properties and clarifies its physical distinctness despite recent scattering light model challenges.
Findings
WIM constitutes up to ~20% of high-latitude H-alpha emission.
Recent models of scattered light do not undermine the established properties of the WIM.
The WIM is confirmed as a major component of the Galactic interstellar medium.
Abstract
We review the observational evidence that the warm ionized medium (WIM) is a major and physically distinct component of the Galactic interstellar medium. Although up to ~20% of the faint, high-latitude H-alpha emission in the Milky Way may be scattered light emitted in midplane H II regions, recent scattered light models do not effectively challenge the well-established properties of the WIM.
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