Bubbles, tunnels, onions, and sheets - The diffuse interstellar medium

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Gaseous Diffusion, Interstellar Gas, Molecular Clouds, Plasma Bubbles, High Temperature Gases, Ionized Gases, Neutral Atoms

Scientific paper

The three general forms of the diffuse interstellar medium are cool clouds (composed of neutral atoms or molecules with temperatures around 80 K and particle densities of the order of 10-100 atoms/cu cm), warm gas (a mixture of neural and ionized gas with a temperature near 8000 K and a density of around 0.1 atoms/cu cm), and coronal gas (with temperatures around 1 million K and a density of less than 0.01 atoms/cu cm). It is currently believed that interstellar clouds are transient phenomena that are both generated and destroyed in the aftermath of supernova explosions. The paper examines and explains the concepts of such transient forms as hot 'bubbles' containing the coronal gas and the tunnels formed upon touching each other, the onionlike clouds composed of layers of different phases of gas (with the coolest, densest gas close to the center and the outer layers in contact with the hot coronal gas surrounding the cloud) and/or sheetlike clouds.

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