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Low-velocity shocks traced by extended SiO emission along the W43 ridges: witnessing the formation of young massive clusters

dc.contributor.authorLUONG, Q. Nguyen
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorMOTTE, F.
dc.contributor.authorCARLHOFF, P.
hal.structure.identifierGroupe d'Etudes des Matériaux Hétérogènes [GEMH]
dc.contributor.authorLOUVET, François
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
dc.contributor.authorLESAFFRE, Pierre
hal.structure.identifierMax Planck Institute for Radio Astronomy
hal.structure.identifierI. Physikalisches Institut [Köln]
dc.contributor.authorSCHILKE, P.
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorHILL, T.
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorHENNEMANN, M.
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
dc.contributor.authorGUSDORF, A.
hal.structure.identifierFORMATION STELLAIRE 2013
dc.contributor.authorSCHNEIDER, N.
hal.structure.identifierFORMATION STELLAIRE 2013
dc.contributor.authorBONTEMPS, Sylvain
hal.structure.identifierFORMATION STELLAIRE 2013
dc.contributor.authorDUARTE-CABRAL, A.
hal.structure.identifierMax-Planck-Institut für Radioastronomie [MPIFR]
dc.contributor.authorMENTEN, K. M.
dc.contributor.authorMARTIN, P. G.
hal.structure.identifierMax-Planck-Institut für Radioastronomie [MPIFR]
dc.contributor.authorWYROWSKI, F.
dc.contributor.authorBENDO, G.
dc.contributor.authorROUSSEL, Hervé
hal.structure.identifierCentre d'étude spatiale des rayonnements [CESR]
dc.contributor.authorBERNARD, J-P.
hal.structure.identifierDepartamento de Astronomia [DAS]
dc.contributor.authorBRONFMAN, L.
hal.structure.identifierMax-Planck-Institut für Astronomie [MPIA]
dc.contributor.authorHENNING, T.
hal.structure.identifierInstituto de RadioAstronomía Milimétrica [IRAM]
dc.contributor.authorKRAMER, C.
dc.contributor.authorHEITSCH, F.
dc.date.created2013-06-04
dc.date.issued2013
dc.identifier.issn0004-637X
dc.description.abstractEnThe formation of high-mass stars is tightly linked to that of their parental clouds. We here focus on the high-density parts of W43, a molecular cloud undergoing an efficient event of formation. The cloud structure is studied with a column density image derived from Herschel continuum maps obtained at 70, 160, 250, 350, and 500 micron. We identify two high-column density filamentary clouds, quoted as the W43-MM1 and W43-MM2 ridges, which both account for 1.5x10^4 Msun gas mass above 10^23 cm-2 and within areas of 5 and 14pc^2, respectively. We used the N_2H^+ 1--0 line to confirm that the W43-MM1 and W43-MM2 ridges are structures coherent in velocity and gravitationally bound, despite their large velocity dispersion and ~5 kms line widths. The most intriguing result of the W43 large program is the bright wide-spread SiO 2--1 emission: 1--11 K kms$ stretching an area of ~28 pc^2. Concentrated toward the W43-MM1 and W43-MM2 ridges and their immediate surroundings, it leads to a total luminosity of L_SiO 2-1 ~4 10^4 K kms kpc^2pc^2. We measured a steep relation between the luminosity and velocity extent of the SiO~2--1 lines and propose to use it to distinguish the low-velocity shocks observed here from the more classical high-velocity ones associated with outflows of high-mass young stellar objects. We used state-of-the-art shock models to demonstrate that low-velocity (<10 kms^-1) shocks with a small amount (10%) of Si atoms initially in gas phase or in grain mantles can explain the observed SiO column density in W43. The spatial and velocity overlaps between the ridges high-density gas (n_H2>10^4-10^5 cm^-3) and the shocked SiO gas suggests that ridges could be forming via colliding flows driven by gravity and accompanied by low-velocity shocks. This mechanism may be the initial conditions for the formation of young massive clusters in these ridges.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.enstars: formation
dc.subject.enISM: structure
dc.subject.enISM: molecules
dc.subject.enISM: clouds
dc.subject.enH II regions
dc.subject.enstars: protostars
dc.title.enLow-velocity shocks traced by extended SiO emission along the W43 ridges: witnessing the formation of young massive clusters
dc.typeArticle de revue
dc.identifier.doi10.1088/0004-637X/775/2/88
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.arxiv1306.0547
bordeaux.journalThe Astrophysical Journal
bordeaux.pageid. 88
bordeaux.volume775
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-00832219
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00832219v1
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