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Collapsing index: a new method to identify star-forming cores based on ALMA images
Yue, Nan-Nan1,2; Gao, Yang3; Li, Di1,2,4; Pan, Liu-Bin3
2021-03-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume21Issue:2Pages:11
AbstractStars form through the gravitational collapse of molecular cloud cores. Before collapsing, the cores are supported by thermal pressure and turbulent motions. A question of critical importance for the understanding of star formation is how to observationally discern whether a core has already initiated gravitational collapse or is still in hydrostatic balance. The canonical method to identify gravitational collapse is based on the observed radial density profile, which would change from Bonnor-Ebert type toward power laws as the core collapses. In practice, due to the projection effect, the resolution limit and other caveats, it has been difficult to directly reveal the dynamical status of cores, particularly in massive star forming regions. We here propose a novel, straightforward diagnostic, namely, the collapsing index (CI), which can be modeled and calculated based on the radial profile of the line width of dense gas. A meaningful measurement of CI requires spatially and spectrally resolved images of optically thin and chemically stable dense gas tracers. ALMA observations are making such data sets increasingly available for massive star forming regions. Applying our method to one of the deepest dense-gas spectral images ever taken toward such a region, namely, the Orion molecular cloud, we detect the dynamical status of selected cores. We observationally distinguished a collapsing core in a massive star forming region from a hydrostatical one. Our approach would help significantly improve our understanding of the interaction between gravity and turbulence within molecular cloud cores in the process of star formation.
Keywordstars formation ISM molecules ISM kinematics and dynamics turbulence
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Sun Yat-Sen University ; Sun Yat-Sen University ; NSFC ; NSFC ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Sun Yat-Sen University ; Sun Yat-Sen University ; NSFC ; NSFC ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Sun Yat-Sen University ; Sun Yat-Sen University ; NSFC ; NSFC ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Sun Yat-Sen University ; Sun Yat-Sen University ; NSFC ; NSFC
DOI10.1088/1674-4527/21/2/26
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC)[11988101] ; National Natural Science Foundation of China (NSFC)[11911530226] ; Sun Yat-Sen University ; NSFC[11973098]
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Sun Yat-Sen University ; Sun Yat-Sen University ; NSFC ; NSFC ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Sun Yat-Sen University ; Sun Yat-Sen University ; NSFC ; NSFC ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Sun Yat-Sen University ; Sun Yat-Sen University ; NSFC ; NSFC ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Sun Yat-Sen University ; Sun Yat-Sen University ; NSFC ; NSFC
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000631515000001
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/78847
Collection中国科学院国家天文台
Corresponding AuthorGao, Yang
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China
4.Univ KwaZulu Natal, NAOC UKZN Computat Astrophys Ctr, ZA-4000 Durban, South Africa
Recommended Citation
GB/T 7714
Yue, Nan-Nan,Gao, Yang,Li, Di,et al. Collapsing index: a new method to identify star-forming cores based on ALMA images[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2021,21(2):11.
APA Yue, Nan-Nan,Gao, Yang,Li, Di,&Pan, Liu-Bin.(2021).Collapsing index: a new method to identify star-forming cores based on ALMA images.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,21(2),11.
MLA Yue, Nan-Nan,et al."Collapsing index: a new method to identify star-forming cores based on ALMA images".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 21.2(2021):11.
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