PAHs molecules and heating of the interstellar gas.

Details PAHs molecules and heating of the interstellar gas. PAHs molecules and heating of the interstellar gas.

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989iaus..135p.183v&link_type=abstract

IAU Symposium No. 135: Interstellar dust: contributed papers, p. 183 - 188

Physics

Interstellar Gas: Polycyclic Hydrocarbons, Interstellar Gas: Molecules, Interstellar Gas: Heating

Scientific paper

Using photoionization cross-sections measured in the laboratory the authors have shown that in order to balance the observed cooling rates in cold diffuse clouds (T ≍ 80K) the PAH's would have to contain 15% of the cosmic abundance of carbon. This value does not contradict the former estimation of 6% deduced from the IR emission bands since this latter is to be taken as a lower limit. Further the authors have estimated that the contribution to the heating rate due to PAH's in a warm H I cloud (T ≍ 8.103K), assuming the same PAH abundance as for cold H I cloud, would represent a significant fraction of the value required to keep the medium in thermal balance. Hence photoionization of PAH's might well be a major heat source for the cold and warm H I media.

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