Ionization cross-section measurements for two PAH molecules - Implications for the heating of diffuse interstellar gas

Details Ionization cross-section measurements for two PAH molecules - Implications for the heating of diffuse interstellar gas Ionization cross-section measurements for two PAH molecules - Implications for the heating of diffuse interstellar gas

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...237..436v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 237, no. 2, Oct. 1990, p. 436-444.

Astronomy and Astrophysics

Astrophysics

86

Gaseous Diffusion, Hydrocarbons, Interstellar Gas, Ionization Cross Sections, Abundance, Diffuse Radiation, Gas Pressure, Molecular Collisions, Photoionization

Scientific paper

It has been suggested that photoionization of PAH molecules could be a very efficient heating process for the diffuse interstellar medium. To estimate this heat input, measurements of photoionization cross-sections were performed for two PAH molecules, coronene and pyrene. It is found that the PAH heating rate could be dominant for the cold diffuse clouds and provide a significant fraction of the heating required to support the warm phase at the observed pressure.

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