Global collapse of molecular clouds as a formation mechanism for the most massive stars
hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
dc.contributor.author | PERETTO, N. | |
hal.structure.identifier | School of Physics and Astronomy [Manchester] | |
dc.contributor.author | FULLER, G. A. | |
hal.structure.identifier | FORMATION STELLAIRE 2013 | |
dc.contributor.author | DUARTE-CABRAL, A. | |
hal.structure.identifier | School of Physics and Astronomy [Manchester] | |
dc.contributor.author | AVISON, A. | |
hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
dc.contributor.author | HENNEBELLE, P. | |
hal.structure.identifier | School of Physics and Astronomy [Manchester] | |
dc.contributor.author | PINEDA, J. E. | |
hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
dc.contributor.author | ANDRE, Ph. | |
hal.structure.identifier | FORMATION STELLAIRE 2013 | |
dc.contributor.author | BONTEMPS, Sylvain | |
hal.structure.identifier | Institut de Recherches sur les lois Fondamentales de l'Univers [IRFU] | |
dc.contributor.author | MOTTE, F. | |
hal.structure.identifier | FORMATION STELLAIRE 2013 | |
dc.contributor.author | SCHNEIDER, N. | |
hal.structure.identifier | Istituto di Fisica dello Spazio Interplanetario [IFSI] | |
dc.contributor.author | MOLINARI, S. | |
dc.date.created | 2013-07-09 | |
dc.date.issued | 2013 | |
dc.identifier.issn | 0004-6361 | |
dc.description.abstractEn | The relative importance of primordial molecular cloud fragmentation versus large-scale accretion still remains to be assessed in the context of massive core/star formation. Studying the kinematics of the dense gas surrounding massive-star progenitors can tell us the extent to which large-scale flow of material impacts the growth in mass of star-forming cores. Here we present a comprehensive dataset of the 5500(+/-800) Msun infrared dark cloud SDC335.579-0.272 (hereafter SDC335) which exhibits a network of cold, dense, parsec-long filaments. Atacama Large Millimeter Array (ALMA) Cycle 0 observations reveal two massive star-forming cores, MM1 and MM2, sitting at the centre of SDC335 where the filaments intersect. With a gas mass of 545(+770,-385) Msun contained within a source diameter of 0.05pc, MM1 is one of the most massive, compact protostellar cores ever observed in the Galaxy. As a whole, SDC335 could potentially form an OB cluster similar to the Trapezium cluster in Orion. ALMA and Mopra single-dish observations of the SDC335 dense gas furthermore reveal that the kinematics of this hub-filament system are consistent with a global collapse of the cloud. These molecular-line data point towards an infall velocity V_{inf} =0.7(+/-0.2) km/s, and a total mass infall rate \dot{M}_{inf} = 2.5(+/-1.0) x 10^{-3} Msun/yr towards the central pc-size region of SDC335. This infall rate brings 750(+/-300) Msun of gas to the centre of the cloud per free-fall time (t_{ff}=3x10^5 yr). This is enough to double the mass already present in the central pc-size region in 3.5(+2.2,-1.0) x t_{ff}. These values suggest that the global collapse of SDC335 over the past million year resulted in the formation of an early O-type star progenitor at the centre of the cloud's gravitational potential well. | |
dc.language.iso | en | |
dc.publisher | EDP Sciences | |
dc.title.en | Global collapse of molecular clouds as a formation mechanism for the most massive stars | |
dc.type | Article de revue | |
dc.identifier.doi | 10.1051/0004-6361/201321318 | |
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 | 1307.2590 | |
dc.description.sponsorshipEurope | Toward a Complete View of Star Formation: The Origin of Molecular Clouds, Prestellar Cores, and Star Clusters | |
bordeaux.journal | Astronomy and Astrophysics - A&A | |
bordeaux.page | id.A112 | |
bordeaux.volume | 555 | |
bordeaux.peerReviewed | oui | |
hal.identifier | hal-00844326 | |
hal.version | 1 | |
hal.origin.link | https://hal.archives-ouvertes.fr//hal-00844326v1 | |
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