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The role of turbule...
The role of turbulence in high-mass star formation: Subsonic and transonic turbulence are ubiquitously found at early stages
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- Wang, Chao (author)
- Beijing University of Technology
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- Wang, Ke (author)
- Beijing University of Technology
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- Xu, Feng Wei (author)
- Beijing University of Technology
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- Sanhueza, Patricio (author)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Liu, Hauyu Baobab (author)
- National Sun Yat-Sen University
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- Zhang, Qizhou (author)
- Harvard-Smithsonian Center for Astrophysics
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- Lu, Xing (author)
- Shanghai Astronomical Observatory. Chinese Academy of Sciences,Shanghai Astronomical Observatory Chinese Academy of Sciences
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- Fontani, Francesco (author)
- Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Caselli, P. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Busquet, Gemma (author)
- Institut d'Estudis Espacials de Catalunya (IEEC),Institute of Space Studies of Catalonia (IEEC),Universitat de Barcelona,University of Barcelona
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- Tan, Jonathan, 1973 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Li, Di (author)
- Chinese Academy of Sciences
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- Jackson, J. M. (author)
- Green Bank Observatory,NASA Ames Research Center,University of Virginia
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- Pillai, Thushara (author)
- Boston University
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- Ho, Paul T.P. (author)
- Academia Sinica Taiwan,East Asian Observatory
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- Guzmán, Andrés E. (author)
- National Astronomical Observatory of Japan
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- Yue, Nannan (author)
- Beijing University of Technology
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 681
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https://doi.org/10.1...
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Abstract
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- Context. Traditionally, supersonic turbulence is considered to be one of the most likely mechanisms slowing the gravitational collapse in dense clumps, thereby enabling the formation of massive stars. However, several recent studies have raised differing points of view based on observations carried out with sufficiently high spatial and spectral resolution. These studies call for a re-evaluation of the role turbulence plays in massive star-forming regions. Aims. Our aim is to study the gas properties, especially the turbulence, in a sample of massive star-forming regions with sufficient spatial and spectral resolution, which can both resolve the core fragmentation and the thermal line width. Methods. We observed NH3 metastable lines with the Very Large Array (VLA) to assess the intrinsic turbulence. Results. Analysis of the turbulence distribution histogram for 32 identified NH3 cores reveals the presence of three distinct components. Furthermore, our results suggest that (1) sub-and transonic turbulence is a prevalent (21 of 32) feature of massive star-forming regions and those cold regions are at early evolutionary stage. This investigation indicates that turbulence alone is insufficient to provide the necessary internal pressure required for massive star formation, necessitating further exploration of alternative candidates; and (2) studies of seven multi-core systems indicate that the cores within each system mainly share similar gas properties and masses. However, two of the systems are characterized by the presence of exceptionally cold and dense cores that are situated at the spatial center of each system. Our findings support the hub-filament model as an explanation for this observed distribution.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Keyword
- Radio lines: ISM
- Turbulence
- ISM: kinematics and dynamics
- Submillimeter: ISM
- Stars: formation
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Wang, Chao
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Wang, Ke
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Xu, Feng Wei
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Sanhueza, Patric ...
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Liu, Hauyu Baoba ...
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Zhang, Qizhou
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Lu, Xing
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Fontani, Frances ...
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Caselli, P.
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Busquet, Gemma
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Tan, Jonathan, 1 ...
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Li, Di
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Jackson, J. M.
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Pillai, Thushara
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Ho, Paul T.P.
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Guzmán, Andrés E ...
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Yue, Nannan
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NATURAL SCIENCES
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ENGINEERING AND ...
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Chalmers University of Technology