Herschel observations of the W3 GMC: clues to the formation of clusters of high-mass stars

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DOIResolve DOI: http://doi.org/10.1088/0004-637X/766/2/85
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TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
1538-4357
Volume766
Issue2
Article number85
Pages114
SubjectDust; Extinction; Infrared stars; Westerhout 3; Individual stars; Early-type stars; Star formation
AbstractThe W3 GMC is a prime target for the study of the early stages of high-mass star formation. We have used Herschel data from the HOBYS key program to produce and analyze column density and temperature maps. Two preliminary catalogs were produced by extracting sources from the column density map and from Herschel maps convolved to 500 μm resolution. Herschel reveals that among the compact sources (FWHM < 0.45 pc), W3 East, W3 West, and W3 (OH) are the most massive and luminous and have the highest column density. Considering the unique properties of W3 East and W3 West, the only clumps with ongoing high-mass star formation, we suggest a "convergent constructive feedback" scenario to account for the formation of a cluster with decreasing age and increasing system/source mass toward the innermost regions. This process, which relies on feedback by high-mass stars to ensure the availability of material during cluster formation, could also lead to the creation of an environment suitable for the formation of Trapezium-like systems. In common with other scenarios proposed in other HOBYS studies, our results indicate that an active/dynamic process aiding in the accumulation, compression, and confinement of material is a critical feature of the high-mass star/cluster formation, distinguishing it from classical low-mass star formation. The environmental conditions and availability of triggers determine the form in which this process occurs, implying that high-mass star/cluster formation could arise from a range of scenarios: from large-scale convergence of turbulent flows to convergent constructive feedback or mergers of filaments.
Publication date
PublisherIOP Publishing
LanguageEnglish
AffiliationNational Science Infrastructure; National Research Council Canada
Peer reviewedNo
NPARC number23000538
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Record identifierb32f4759-ccf7-4ab3-98ce-925de81a099e
Record created2016-07-28
Record modified2016-07-28
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