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Chemical differentiation along the CepA-East outflows

dc.contributor.authorCODELLA, C.
dc.contributor.authorBACHILLER, R.
dc.contributor.authorBENEDETTINI, M.
hal.structure.identifierINAF - Osservatorio Astrofisico di Arcetri [OAA]
dc.contributor.authorCASELLI, P.
dc.contributor.authorVITI, S.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierDepartment of Physics
hal.structure.identifierDepartment of Physics, The Ohio State University
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierDepartment of Physics [OSU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorWAKELAM, Valentine
dc.date.created2005
dc.date.issued2005
dc.identifier.issn0035-8711
dc.description.abstractEnWe present the results of a multiline survey at mm-wavelengths of the Cepheus A star forming region. Four main flows have been identified: three pointing in the SW, NE, and SE directions and accelerating high density CS clumps. The fourth outflow, revealed by high-sensitivity HDO observations, is pointing towards South and is associated with conditions particularly favourable to a chemical enrichment. The analysis of the line profiles shows that the SiO molecule dominates at the highest velocities and at the highest excitation conditions, confirming its close association with shocks. H2S, SO2, and SO preferentially trace more quiescent regions than SiO, and in particular a lack of bright H2S emission at the highest velocities is found. OCS and H2CS emit at quite high velocities, where the abundances of three shock tracers like SiO, CH3OH, and HDO are higher. These results may indicate that H2S is not the only major sulphur carrier in the grain mantles, and that OCS and H2CS may probably play an important role on the grains; or that alternatively they rapidly form once the mantle is evaporated after the passage of a shock. Finally, the outflow peak emission has been compared with recent time-dependent sulphur chemistry models: the results indicate that, if associated with accurate measurements of the physical conditions, the CH3OH/H2CS column density ratio can be used as an effective chemical clock to date the age of shocked gas.
dc.language.isoen
dc.publisherOxford University Press (OUP): Policy P - Oxford Open Option A
dc.subject.enISM: clouds
dc.subject.enRadio lines: ISM
dc.subject.enISM: molecules
dc.subject.enISM: individual objects: CepA
dc.subject.enISM: jets and outflows
dc.title.enChemical differentiation along the CepA-East outflows
dc.typeArticle de revue
dc.identifier.doi10.1111/j.1365-2966.2005.09165.x
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
dc.identifier.arxivastro-ph/0505168
bordeaux.journalMonthly Notices of the Royal Astronomical Society
bordeaux.page244
bordeaux.volume361
bordeaux.peerReviewedoui
hal.identifierhal-00261281
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00261281v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Monthly%20Notices%20of%20the%20Royal%20Astronomical%20Society&rft.date=2005&rft.volume=361&rft.spage=244&rft.epage=244&rft.eissn=0035-8711&rft.issn=0035-8711&rft.au=CODELLA,%20C.&BACHILLER,%20R.&BENEDETTINI,%20M.&CASELLI,%20P.&VITI,%20S.&rft.genre=article


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