The distribution of atomic hydrogen and diffuse gas in the Galaxy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Structure, Hydrogen Clouds, Interstellar Gas, Milky Way Galaxy, Spiral Galaxies, Cosmic Dust, Gamma Ray Astronomy, Hydrogen Atoms, Magellanic Clouds, Radial Velocity

Scientific paper

The structures and distributions of gas clouds and HI in the Galaxy are discussed in terms of the solar circle, i.e., within 10 kpc of the solar system and the rest of the Galaxy. The distributions are considered with respect to the galactocentric radius and the height above the galactic plane. Features of high-velocity HI particles, particularly in the Magellanic stream, are described, along with the behavior of high- and intermediate-velocity gas. Comparisons are made with the gas characteristics and densities observed in the Local Group galaxies. The hot gases extend further out on the galactocentric radius than does the HI and forms a halo around the Galaxy which can be detected only by UV and optical spectra observations. Finally, areas in which dust and gas mix or remain separate are discussed.

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