Theoretical studies of interstellar molecular shocks. IX - The influence of PAH molecules on the ratio C/CO in dark clouds

Details Theoretical studies of interstellar molecular shocks. IX - The influence of PAH molecules on the ratio C/CO in dark clouds Theoretical studies of interstellar molecular shocks. IX - The influence of PAH molecules on the ratio C/CO in dark clouds

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..741f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, Aug. 1, 1989, p. 741-750. Research supported by SE

Astronomy and Astrophysics

Astronomy

5

Abundance, Cyclic Hydrocarbons, Interstellar Matter, Molecular Clouds, Shock Waves, Carbon, Carbon Monoxide, Conservation Equations, Interstellar Chemistry, Magnetohydrodynamic Turbulence, Shock Heating

Scientific paper

We consider the equilibrium state of the gas in dark clouds, in the presence of PAH molecules. The ratio n(C)/n(CO) is found to be enhanced by the presence of PAH- ions but is strongly reduced by including the reaction C(O2, CO)O. The fractional abundance of O2 molecules depends on the branching ratio to OH in the dissociative recombination of H3O+, through the reaction O(OH,O2)H. It is found that shocks with speeds in the range 10≤ us ≤ 2O km s-1 produce `warm' gas, in which the maximum temperature of the neutral particles Tn ≍ 100K, over a distance of 1-3 pc when the magnetic field strength attains a few hundred microgauss in preshock gas of density 104 cm-3. The relevance of these results to observations of molecular clouds in the Galactic discussed.

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