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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.author | LUONG, Q. Nguyen | |
hal.structure.identifier | Institut de Recherches sur les lois Fondamentales de l'Univers [IRFU] | |
dc.contributor.author | MOTTE, F. | |
dc.contributor.author | CARLHOFF, P. | |
hal.structure.identifier | Groupe d'Etudes des Matériaux Hétérogènes [GEMH] | |
dc.contributor.author | LOUVET, François | |
hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
dc.contributor.author | LESAFFRE, Pierre | |
hal.structure.identifier | Max Planck Institute for Radio Astronomy | |
hal.structure.identifier | I. Physikalisches Institut [Köln] | |
dc.contributor.author | SCHILKE, P. | |
hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
dc.contributor.author | HILL, T. | |
hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
dc.contributor.author | HENNEMANN, M. | |
hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
dc.contributor.author | GUSDORF, A. | |
hal.structure.identifier | FORMATION STELLAIRE 2013 | |
dc.contributor.author | SCHNEIDER, N. | |
hal.structure.identifier | FORMATION STELLAIRE 2013 | |
dc.contributor.author | BONTEMPS, Sylvain | |
hal.structure.identifier | FORMATION STELLAIRE 2013 | |
dc.contributor.author | DUARTE-CABRAL, A. | |
hal.structure.identifier | Max-Planck-Institut für Radioastronomie [MPIFR] | |
dc.contributor.author | MENTEN, K. M. | |
dc.contributor.author | MARTIN, P. G. | |
hal.structure.identifier | Max-Planck-Institut für Radioastronomie [MPIFR] | |
dc.contributor.author | WYROWSKI, F. | |
dc.contributor.author | BENDO, G. | |
dc.contributor.author | ROUSSEL, Hervé | |
hal.structure.identifier | Centre d'étude spatiale des rayonnements [CESR] | |
dc.contributor.author | BERNARD, J-P. | |
hal.structure.identifier | Departamento de Astronomia [DAS] | |
dc.contributor.author | BRONFMAN, L. | |
hal.structure.identifier | Max-Planck-Institut für Astronomie [MPIA] | |
dc.contributor.author | HENNING, T. | |
hal.structure.identifier | Instituto de RadioAstronomía Milimétrica [IRAM] | |
dc.contributor.author | KRAMER, C. | |
dc.contributor.author | HEITSCH, F. | |
dc.date.created | 2013-06-04 | |
dc.date.issued | 2013 | |
dc.identifier.issn | 0004-637X | |
dc.description.abstractEn | The 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.iso | en | |
dc.publisher | American Astronomical Society | |
dc.subject.en | stars: formation | |
dc.subject.en | ISM: structure | |
dc.subject.en | ISM: molecules | |
dc.subject.en | ISM: clouds | |
dc.subject.en | H II regions | |
dc.subject.en | stars: protostars | |
dc.title.en | Low-velocity shocks traced by extended SiO emission along the W43 ridges: witnessing the formation of young massive clusters | |
dc.type | Article de revue | |
dc.identifier.doi | 10.1088/0004-637X/775/2/88 | |
dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR] | |
dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR] | |
dc.identifier.arxiv | 1306.0547 | |
bordeaux.journal | The Astrophysical Journal | |
bordeaux.page | id. 88 | |
bordeaux.volume | 775 | |
bordeaux.issue | 2 | |
bordeaux.peerReviewed | oui | |
hal.identifier | hal-00832219 | |
hal.version | 1 | |
hal.popular | non | |
hal.audience | Internationale | |
hal.origin.link | https://hal.archives-ouvertes.fr//hal-00832219v1 | |
bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The%20Astrophysical%20Journal&rft.date=2013&rft.volume=775&rft.issue=2&rft.spage=id.%2088&rft.epage=id.%2088&rft.eissn=0004-637X&rft.issn=0004-637X&rft.au=LUONG,%20Q.%20Nguyen&MOTTE,%20F.&CARLHOFF,%20P.&LOUVET,%20Fran%C3%A7ois&LESAFFRE,%20Pierre&rft.genre=article |
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