Abstract
The interstellar medium of M33 consists of five principal components: (1) neutral hydrogen gas, which is distributed broadly in a spiral structure, (2) high temperature excited gas that is primarily concentrated in luminous HII regions which are usually found in spiral arm segments, (3) very high temperature gas that is detected by x-ray telescopes, (4) interstellar dust, which can be detected either through reddening of stars or through infrared emission, such as mapped by the Spitzer Infrared Telescope, and (5) molecular gas, which can be detected by emission, especially by carbon monoxide molecules, and by absorption in the case of molecular hydrogen. Most of these topics are covered in this chapter.
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Hodge, P. (2012). Gas and Dust. In: The Spiral Galaxy M33. Astrophysics and Space Science Library, vol 379. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-2025-1_7
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