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Acetone in Orion BN/KL - High-resolution maps of a special oxygen-bearing molecule

hal.structure.identifierFORMATION STELLAIRE 2013
dc.contributor.authorPENG, T.-C.
hal.structure.identifierFORMATION STELLAIRE 2013
dc.contributor.authorDESPOIS, D.
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorBROUILLET, N.
hal.structure.identifierFORMATION STELLAIRE 2013
dc.contributor.authorBAUDRY, Alain
dc.contributor.authorFAVRE, C.
dc.contributor.authorREMIJAN, A.
dc.contributor.authorWOOTTEN, A.
dc.contributor.authorWILSON, T. L.
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
dc.contributor.authorCOMBES, F.
dc.contributor.authorWLODARCZAK, G.
dc.date.created2013-04-17
dc.date.issued2013
dc.identifier.issn0004-6361
dc.description.abstractEnAs one of the prime targets of interstellar chemistry study, Orion BN/KL clearly shows different molecular distributions between large nitrogen- (e.g., C2H5CN) and oxygen-bearing (e.g., HCOOCH3) molecules. However, acetone (CH3)2CO, a special complex O-bearing molecule, has been shown to have a very different distribution from other typical O-bearing molecules in the BN/KL region. We searched for acetone within our IRAM Plateau de Bure Interferometer 3 mm and 1.3 mm data sets. Twenty-two acetone lines were searched within these data sets. The angular resolution ranged from 1.8 X 0.8 to 6.0 X 2.3 arcsec^2, and the spectral resolution ranged from 0.4 to 1.9 km s-1. Nine of the acetone lines appear free of contamination. Three main acetone peaks (Ace-1, 2, and 3) are identified in Orion BN/KL. The new acetone source Ace-3 and the extended emission in the north of the hot core region have been found for the first time. An excitation temperature of about 150 K is determined toward Ace-1 and Ace-2, and the acetone column density is estimated to be 2-4 X 10^16 cm-2 with a relative abundance of 1-6 X 10^-8 toward these two peaks. Acetone is a few times less abundant toward the hot core and Ace-3 compared with Ace-1 and Ace-2. We find that the overall distribution of acetone in BN/KL is similar to that of N-bearing molecules, e.g., NH3 and C2H5CN, and very different from those of large O-bearing molecules, e.g., HCOOCH3 and (CH3)2O. Our findings show the acetone distribution is more extended than in previous studies and does not originate only in those areas where both N-bearing and O-bearing species are present. Moreover, because the N-bearing molecules may be associated with shocked gas in Orion BN/KL, this suggests that the formation and/or destruction of acetone may involve ammonia or large N-bearing molecules in a shocked-gas environment.
dc.language.isoen
dc.publisherEDP Sciences
dc.title.enAcetone in Orion BN/KL - High-resolution maps of a special oxygen-bearing molecule
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201220891
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.identifier.arxiv1304.4793
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A78
bordeaux.volume554
bordeaux.peerReviewedoui
hal.identifierhal-00822073
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00822073v1
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