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The earliest phases of massive star formation within entire molecular cloud complexes

dc.contributor.authorFRÉDÉRIQUE, Motte
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
dc.contributor.authorBONTEMPS, Sylvain
dc.contributor.authorSCHILKE, P.
dc.contributor.authorD. C., Lis
dc.contributor.authorSCHNEIDER, N.
dc.contributor.authorK. M., Menten
dc.date.issued2005
dc.date.conference2005-05-16
dc.description.abstractEnWe started (sub-)millimeter continuum and line studies of entire molecular cloud complexes located at intermediate distances from the Sun (1-3 kpc). Such an unbiased approach allows to identify and characterize the earliest phases of high-mass stars overlooked by IRAS or MSX. Our complete MAMBO-2 surveys of the Cygnus X and NGC 7538 complexes reveal a large population of ˜ 0.1 pc-size massive young stellar objects (MYSOs) harboring high-mass infrared-quiet protostars. The determination of the nature of all the new millimeter sources is still in progress but we have already collected evidence that the infrared-quiet (or class 0-like) protostellar phase might last as long as the better-known infrared-bright protostellar phase. Besides, our complete census of MYSOs fails to discover the high-mass analogues of pre-stellar dense cores. We propose that the observed lower-density pre-stellar clumps ({>} 1 pc) rapidly concentrate and collapse as also found in the kinematical studies of other prominent clumps. Indeed, CS and HCO^+ mappings in W43 and Cygnus X suggest global supersonic contraction with inward velocities of several km s‑1 on parsec scales. Our work and similar studies of entire star-forming complexes will thus definitively contribute to a better knowledge of the earliest phases of high-mass star formation.
dc.language.isoen
dc.source.titleIAU Symposium Proceedings of the international Astronomical Union 227 - 2005IAUS..227..151M
dc.title.enThe earliest phases of massive star formation within entire molecular cloud complexes
dc.typeCommunication dans un congrès
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.page151-156
bordeaux.volume227
bordeaux.conference.titleMassive star birth: A crossroads of Astrophysics
bordeaux.countryIT
bordeaux.title.proceedingIAU Symposium Proceedings of the international Astronomical Union 227 - 2005IAUS..227..151M
bordeaux.peerReviewedoui
hal.identifierhal-00400812
hal.version1
hal.invitednon
hal.proceedingsoui
hal.conference.end2005-05-20
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00400812v1
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