An implication of the IR identification of PAHs: The heating of the diffuse IS gas

Details An implication of the IR identification of PAHs: The heating of the diffuse IS gas An implication of the IR identification of PAHs: The heating of the diffuse IS gas

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.290..225v&link_type=abstract

In ESA, Infrared Spectroscopy in Astronomy p 225-230 (SEE N90-19084 11-89)

Astronomy and Astrophysics

Astronomy

Cyclic Hydrocarbons, Infrared Spectra, Interstellar Matter, Ionization Cross Sections, Photoionization, H I Regions, Heating, Spectrum Analysis, Temperature Effects

Scientific paper

The heating mechanisms of the observed H I diffuse medium warm phase are investigated. The heating due to photoionization of the Polycyclic Aromatic Hydrocarbons (PAHs) is estimated. It is found that PAHs dominate the heating of the cold phase and that it would represent an important fraction of that required for the warm phase. The following topics are discussed: the PAH's photoionization cross sections, the physical quantities for PAH heating and evolution of heating with temperature.

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