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Gas and dust in the interstellar medium

David A Williams

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In this article I shall describe the gas and dust in the interstellar medium. I review the evidence for dust and describe its likely nature. Its many roles in the interstellar medium, especially its effect on interstellar chemistry in star-forming regions, are discussed. The nature of the molecular interstellar gas is described, and a brief account of the interstellar chemistry that produces these molecules is given. Several examples of the interaction between gas and dust in star forming regions are given to demonstrate the importance of these components of the Milky Way and other galaxies.


PACS

98.58.Ca Interstellar dust grains; diffuse emission; infrared cirrus

98.58.Bz Atomic, molecular, chemical, and grain processes

98.38.Cp Interstellar dust grains; diffuse emission; infrared cirrus

98.38.Bn Atomic, molecular, and chemical, and grain processes

Subjects

Atomic and molecular physics

Astrophysics and astroparticles

Dates

Issue 1 (2005)



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  10. Retrieving physical conditions from interstellar H2 emission lines: a non linear fitting technique

    Silvia Casu and Cesare Cecchi-Pestellini 2005 J. Phys.: Conf. Ser. 6 191

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