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A sensitivity study of the neutral-neutral reactions C + C3 and C + C5 in cold dense interstellar clouds

hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
dc.contributor.authorWAKELAM, Valentine
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorLOISON, Jean-Christophe
hal.structure.identifierDepartment of Physics [OHIO STATE UNIVERSITY]
hal.structure.identifierDepartments of Astronomy and Chemistry
dc.contributor.authorHERBST, Eric
hal.structure.identifierGroupe de Recherche en Astronomie et Astrophysique du Languedoc [GRAAL]
dc.contributor.authorTALBI, Dahbia
hal.structure.identifierDepartment of Physics [OHIO STATE UNIVERSITY]
hal.structure.identifierDepartments of Astronomy and Chemistry
dc.contributor.authorQUAN, Dongui
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorCARALP, Françoise
dc.date.issued2009
dc.identifier.issn0004-6361
dc.description.abstractEnChemical networks used for models of interstellar clouds contain many reactions, some of them with poorly determined rate coefficients and/or products. In this work, we report a method for improving the predictions of molecular abundances using sensitivity methods and ab initio calculations. Based on the chemical network osu.2003, we used two different sensitivity methods to determine the most important reactions as a function of time for models of dense cold clouds. Of these reactions, we concentrated on those between C and C3 and between C and C5, both for their effect on specific important species such as CO and for their general effect on large numbers of species. We then used ab initio and kinetic methods to determine an improved rate coefficient for the former reaction and a new set of products, plus a slightly changed rate coefficient for the latter. Putting our new results in a pseudo-time-dependent model of cold dense clouds, we found that the abundances of many species are altered at early times, based on large changes in the abundances of CO and atomic C. We compared the effect of these new rate coefficients/products on the comparison with observed abundances and found that they shift the best agreement from 3e4 yr to (1-3)e5 yr.
dc.language.isoen
dc.publisherEDP Sciences
dc.title.enA sensitivity study of the neutral-neutral reactions C + C3 and C + C5 in cold dense interstellar clouds
dc.typeArticle de revue
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv0901.1746
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page513-521
bordeaux.volume495
bordeaux.peerReviewedoui
hal.identifierhal-00352449
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00352449v1
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