Abstract
The interstellar medium (ISM) is highly turbulent, with large pressure fluctuations due to energy injection by stars and by instabilities in the disk of the Galaxy. The diffuse gas exists in different states that are all at about the same pressure in a given region of the Galactic disk: Cold Neutral Medium (CNM) at T ∼ 102 K, Warm Neutral Medium (WNM) and Warm Ionized Medium (WIM) at T ∼ 104 K, and Hot Ionized Medium (HIM) at T ∼ 106 K. This diffuse medium forms the background in which molecular clouds form. The surfaces of molecular clouds are atomic and are at the same pressure as the ambient ISM, but the bulk of the molecular gas is self-gravitating (in the Milky Way, at least) and is at a higher pressure.KeywordsInterstellar MediumMolecular CloudStar Formation RateGalactic DiskThermal PressureThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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