Carbon Chemistry in Photodissociation Regions

Details Carbon Chemistry in Photodissociation Regions Carbon Chemistry in Photodissociation Regions

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iaus..231..153g&link_type=abstract

Astrochemistry: Recent Successes and Current Challenges, Proceedings of the 231st Symposium of the International Astronomical Un

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Scientific paper

We present recent results on the carbon chemistry in photodissociation regions. We show that carbon chains and rings (CCH, c-C_3H_2 and C_4H) are tightly spatially correlated with each other, and with the mid-infrared emission due to PAHs (7 and 15 μm), mapped by ISOCAM. Neither the spatial distribution, nor the abundances of these species can be fit by state-of-the-art PDR models, which calls for another production mechanism. We discuss model predictions for carbon clusters and simple hydrocarbons. We show how selected abundance ratios can be used as a diagnostic of the physical conditions. We stress the need for more theoretical and laboratory work on fundamental processes relevant for the interstellar medium, which should be taken into account in the astrochemical models, but whose rates are not known accurately enough.

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