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Properties of massive star-forming clumps with infall motions
He, Yu-Xin1,2; Zhou, Jian-Jun1,3; Esimbek, Jarken1,3; Ji, Wei-Guang1,3; Wu, Gang1,2,3; Tang, Xin-Di1,3,4; Komesh, Toktarkhan5; Yuan, Ye1,3; Li, Da-Lei1,3; Baan, W. A.6
2016-09-21
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume461Issue:3Pages:2288-2308
Contribution Rank1
Abstract

In this work, we aim to characterize high-mass clumps with infall motions. We selected 327 clumps from the Millimetre Astronomy Legacy Team 90-GHz survey, and identified 100 infall candidates. Combined with the results of He et al., we obtained a sample of 732 high-mass clumps, including 231 massive infall candidates and 501 clumps where infall is not detected. Objects in our sample were classified as pre-stellar, proto-stellar, H II or photodissociation region (PDR). The detection rates of the infall candidates in the pre-stellar, proto-stellar, H II and PDR stages are 41.2 per cent, 36.6 per cent, 30.6 per cent and 12.7 per cent, respectively. The infall candidates have a higher H-2 column density and volume density compared with the clumps where infall is not detected at every stage. For the infall candidates, the median values of the infall rates at the pre-stellar, proto-stellar, H II and PDR stages are 2.6 x 10(-3), 7.0 x 10(-3), 6.5 x 10(-3) and 5.5 x 10(-3) M-circle dot yr(-1), respectively. These values indicate that infall candidates at later evolutionary stages are still accumulating material efficiently. It is interesting to find that both infall candidates and clumps where infall is not detected show a clear trend of increasing mass from the pre-stellar to proto-stellar, and to the H II stages. The power indices of the clump mass function are 2.04 +/- 0.16 and 2.17 +/- 0.31 for the infall candidates and clumps where infall is not detected, respectively, which agree well with the power index of the stellar initial mass function (2.35) and the cold Planck cores (2.0).

Correspondent Emailheyuxin@xao.ac.cn (y-xh); zhoujj@xao.ac.cn (j-jz)
KeywordStars: Formation Ism: Kinematics And Dynamics Ism: Molecules Radio Lines: Ism
SubtypeArticle
DOI10.1093/mnras/stw1301
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
Language英语
WOS KeywordInfrared-dark Clouds ; H-ii Regions ; Galactic Plane Survey ; Initial Conditions ; Molecular Clouds ; Inner Galaxy ; Cold Cores ; Continuum Observations ; Physical-properties ; Evolutionary Stages
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000383481100003
Funding OrganizationNational Aeronautics and Space Administration ; National Natural Science foundation of China(11433008 ; National Basic Research Program of China (973 program)(2012CB821802) ; Program of the Light in Chinas Western Region (LCRW)(RCPY201202 ; 11373062 ; XBBS-2014-24) ; 11303081)
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/1408
Collection射电天文研究室_恒星形成与演化研究团组
射电天文研究室
Corresponding AuthorHe, Yu-Xin
Affiliation1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100080, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China
4.Max Planck Inst Radioastron, D-53121 Bonn, Germany
5.Al Farabi Kazakh Natl Univ, Fac Phys & Technol, Dept Solid State Phys & Nonlinear Phys, Alma Ata 050040, Kazakhstan
6.Netherlands Inst Radio Astron, NL-7991 PD Dwingeloo, Netherlands
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Corresponding Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
He, Yu-Xin,Zhou, Jian-Jun,Esimbek, Jarken,et al. Properties of massive star-forming clumps with infall motions[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,461(3):2288-2308.
APA He, Yu-Xin.,Zhou, Jian-Jun.,Esimbek, Jarken.,Ji, Wei-Guang.,Wu, Gang.,...&Baan, W. A..(2016).Properties of massive star-forming clumps with infall motions.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,461(3),2288-2308.
MLA He, Yu-Xin,et al."Properties of massive star-forming clumps with infall motions".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 461.3(2016):2288-2308.
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