Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe.113w&link_type=abstract
"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782
Astronomy and Astrophysics
Astrophysics
Modelling_Environments
Scientific paper
Virtually all detailed gas-phase models of the chemistry of dense interstellar clouds are bereft of chemical processes involving polycyclic aromatic hydrocarbons (PAHs). This omission is unfortunate because from the few studies that have been done on the subject, it is known that the inclusion of PAHs can affect the gas-chemistry chemistry strongly. We have added reactions involving PAHs to our network of gas-phase reactions to determine the role PAHs play in the time-dechemistry of cold dense cores. Chemical processes added to the network include radiative attachment to form PAH-, mutual neutralization between PAH anions and small positively-charged ions, and photodetachment. Although our standard model considers small PAHs only, we also test the sensitivity of our results to changes in the size and abundance of the PAHs. Our results confirm that the inclusion of PAHs changes many of the calculated abundances of smaller and larger species considerably. The comparison between our results and observed abundances in the cold cores L134N and TMC1-CP shows that we do not need to decrease the elemental abundances of metals observed in diffuse medium to reproduce the observations if PAHs are included. In addition, the large abundances of carbon-species in TMC1-CP are well reproduced by the model with standard oxygen-rich abundances.
Herbst Eric
Wakelam Valentine
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