Chemical differentiation along the CepA-East outflows
| dc.contributor.author | CODELLA, C. | |
| dc.contributor.author | BACHILLER, R. | |
| dc.contributor.author | BENEDETTINI, M. | |
| hal.structure.identifier | INAF - Osservatorio Astrofisico di Arcetri [OAA] | |
| dc.contributor.author | CASELLI, P. | |
| dc.contributor.author | VITI, S. | |
| hal.structure.identifier | Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB] | |
| hal.structure.identifier | Department of Physics | |
| hal.structure.identifier | The Ohio State University [Columbus] [OSU] | |
| hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
| hal.structure.identifier | Department of Physics [OSU] | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| dc.contributor.author | WAKELAM, Valentine | |
| dc.date.created | 2005 | |
| dc.date.issued | 2005 | |
| dc.identifier.issn | 0035-8711 | |
| dc.description.abstractEn | We 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.iso | en | |
| dc.publisher | Oxford University Press (OUP): Policy P - Oxford Open Option A | |
| dc.subject.en | ISM: clouds | |
| dc.subject.en | Radio lines: ISM | |
| dc.subject.en | ISM: molecules | |
| dc.subject.en | ISM: individual objects: CepA | |
| dc.subject.en | ISM: jets and outflows | |
| dc.title.en | Chemical differentiation along the CepA-East outflows | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1111/j.1365-2966.2005.09165.x | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO] | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | astro-ph/0505168 | |
| bordeaux.journal | Monthly Notices of the Royal Astronomical Society | |
| bordeaux.page | 244 | |
| bordeaux.volume | 361 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00261281 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00261281v1 | |
| bordeaux.COinS | ctx_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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