EAS Publications Series
Volume 34, 2009Astronomy in the Submillimeter and Far Infrared Domains with the Herschel Space Observatory
|Page(s)||151 - 161|
|Published online||20 December 2008|
L. Pagani and M. Gerin (eds)
EAS Publications Series, 34 (2009) 151-161
Physical and Chemical Processes in the Diffuse and Dense Neutral ISM
Dept. of Physics and Astronomy, San Jose State University, San Jose, CA 95192, USA
Most of the mass of the interstellar medium is in neutral phases that are heated by far-ultraviolet radiation from star forming regions. The gas, in turn, emits line radiation in the infrared and submillimeter that potentially has great diagnostic value. In this paper, we will review the physical processes (including heating, cooling, gas phase and grain surface chemistry) that give rise to this line emission and present diagnostic diagrams. We will also discuss several examples where models of neutral gas emission have been used to interpret line emission, including observations of H2O and O2 in molecular clouds and an example which points out the caution that must be used when applying the diagnostics to kiloparsec-sized regions in other galaxies.
© EAS, EDP Sciences, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.