Phases and Structures of Interstellar Gas

Details Phases and Structures of Interstellar Gas Phases and Structures of Interstellar Gas

1999-06-12

arxiv.org/abs/astro-ph/9906217v1

Astronomy and Astrophysics

Astrophysics

15 pages, 5 figures, to be published in "The Physics and Chemistry of the Interstellar Medium," 3rd Cologne-Zermatt Symposium,

Scientific paper

The thermal and chemical phases of the cool component of interstellar gas are discussed. Variations with galactocentric radius and from galaxy to galaxy are mostly the result of changes in the ambient interstellar pressure and radiation field. Interstellar structure that is hierarchical or fractal in the cloudy parts and has large and connected empty regions between these clouds is probably the result of turbulence. Such structure opens up the disk to the transmission of OB star light into the halo, and it provides for a diffuse ionized component that tapers away gradually from each dense HII region. Fractal cloud structure may also produce the cloud and clump mass functions, and perhaps even the star cluster mass function.

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