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Diffuse Cloud Models: Successes and Challenges

Published online by Cambridge University Press:  21 February 2014

E. Roueff,
M. Ruaud,
F. Le Petit,
B. Godard and
J. Le Bourlot
E. Roueff
Affiliation:
LUTh and UMR 8102, Observatoire de Paris, F 92190 Meudon, France email: evelyne.roueff@obspm.fr
M. Ruaud
Affiliation:
LUTh and UMR 8102, Observatoire de Paris, F 92190 Meudon, France email: evelyne.roueff@obspm.fr
F. Le Petit
Affiliation:
LUTh and UMR 8102, Observatoire de Paris, F 92190 Meudon, France email: evelyne.roueff@obspm.fr
B. Godard
Affiliation:
LUTh and UMR 8102, Observatoire de Paris, F 92190 Meudon, France email: evelyne.roueff@obspm.fr
J. Le Bourlot
Affiliation:
LUTh and UMR 8102, Observatoire de Paris, F 92190 Meudon, France email: evelyne.roueff@obspm.fr
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Abstract

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We present the general physical conditions thought to be present in diffuse interstellar clouds. The radiation field is driving the atomic to molecular transition and the resulting physical conditions. We focus on the recent observational signatures of significant values of the cosmic ionization rate (10−16 - 10−15 s−1) which should also impact the clues to Diffuse interstellar Bands.

Keywords

moleculescosmic ionizationinterstellar physics

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