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A Dirty WindowRadiative Transfer Considerations

A Dirty Window: Radiative Transfer Considerations [In this chapter we describe some of the elements of radiative transfer that are necessary to understand the radiation coming from the diffuse interstellar medium. We concentrate on line processes. After a discussion of absorption and emission lines, we use the 21 cm line of hydrogen as an illustrative example. We also briefly discuss the CN transitions that are pumped by the Cosmic Microwave Background radiation. Collisional excitation, complications to radiative transfer from dynamical and nonlocal effects, and elemental abundances and depletions are also discussed. Molecular hydrogen and the Diffuse Interstellar Bands (DIBs) are used as examples of these effects. Finally, radio continuum processes are examined because they provide a way of measuring the properties of interstellar plasmas.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

A Dirty WindowRadiative Transfer Considerations

Part of the Astrophysics and Space Science Library Book Series (volume 442)
Magnani, Loris; Shore, Steven N.
Springer Journals — Apr 9, 2017
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38 pages

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Publisher
Springer Berlin Heidelberg
Copyright
© Springer-Verlag GmbH Germany 2017
ISBN
978-3-662-54348-1
Pages
29 –67
DOI
10.1007/978-3-662-54350-4_2
Publisher site
See Chapter on Publisher Site

Abstract

[In this chapter we describe some of the elements of radiative transfer that are necessary to understand the radiation coming from the diffuse interstellar medium. We concentrate on line processes. After a discussion of absorption and emission lines, we use the 21 cm line of hydrogen as an illustrative example. We also briefly discuss the CN transitions that are pumped by the Cosmic Microwave Background radiation. Collisional excitation, complications to radiative transfer from dynamical and nonlocal effects, and elemental abundances and depletions are also discussed. Molecular hydrogen and the Diffuse Interstellar Bands (DIBs) are used as examples of these effects. Finally, radio continuum processes are examined because they provide a way of measuring the properties of interstellar plasmas.]

Published: Apr 9, 2017

Keywords: Optical Depth; Brightness Temperature; Molecular Cloud; Column Density; Equivalent Width

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