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Carbon Chemistry in Photodissociation Regions

Published online by Cambridge University Press:  21 March 2006

M. Gerin
Affiliation:
LERMA, Observatoire de Paris and ENS, CNRS UMR8112, 24 Rue Lhomond, 75231 Paris cedex 05, France email: gerin@lra.ens.fr, fosse@lra.ens.fr, javier@lra.ens.fr
E. Roueff
Affiliation:
LUTH, Observatoire de Paris, CNRS UMR8102, place J. Janssen, 92195 Meudon cedex, France email: evelyne.roueff@obspm.fr, jacques.lebourlot@obspm.fr
J. Le Bourlot
Affiliation:
LUTH, Observatoire de Paris, CNRS UMR8102, place J. Janssen, 92195 Meudon cedex, France email: evelyne.roueff@obspm.fr, jacques.lebourlot@obspm.fr
J. Pety
Affiliation:
J. Pety, IRAM, 300 rue de la piscine, 38406 Grenoble cedex, France email: pety@iram.fr
J. R. Goicoechea
Affiliation:
LERMA, Observatoire de Paris and ENS, CNRS UMR8112, 24 Rue Lhomond, 75231 Paris cedex 05, France email: gerin@lra.ens.fr, fosse@lra.ens.fr, javier@lra.ens.fr
D. Teyssier
Affiliation:
European Space Astronomy Centre, Villafranca del Castillo, Madrid 28080, Spain email: dteyssier@sciops.esa.int
C. Joblin
Affiliation:
CESR, CNRS and Univ. Paul Sabatier, 9 Avenue du colonel Roche, 31028 Toulouse, France email: joblin@cesr.fr
A. Abergel
Affiliation:
Institut d'Astrophysique Spatiale, CNRS et Univ. Paris-Sud, Bât. 121, 91405 Orsay Cedex, France email: alain.abergel@ias.u-psud.fr
D. Fossé
Affiliation:
LERMA, Observatoire de Paris and ENS, CNRS UMR8112, 24 Rue Lhomond, 75231 Paris cedex 05, France email: gerin@lra.ens.fr, fosse@lra.ens.fr, javier@lra.ens.fr
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Abstract

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We present recent results on the carbon chemistry in photodissociation regions. We show that carbon chains and rings (CCH, c-C$_3$H$_2$ and C$_4$H) are tightly spatially correlated with each other, and with the mid-infrared emission due to PAHs (7 and 15 $\mu$m), 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.

Type
Contributed Papers
Copyright
2006 International Astronomical Union
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