Properties of massive star-forming clumps with infall motions

CORC > 新疆天文台 > 研究单元未命名 > 射电天文研究室 > 恒星形成与演化研究团组

	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, Toktarkhan 5; Yuan, Ye1,3 ; Li, Da-Lei1,3 ; Baan, W. A.6
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2016-09-21
卷号	461 期号:3 页码:2288-2308
关键词	stars: formation ISM: kinematics and dynamics ISM: molecules radio lines: ISM
ISSN号	0035-8711
英文摘要	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).
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	INFRARED-DARK CLOUDS ; H-II REGIONS ; GALACTIC PLANE SURVEY ; INITIAL CONDITIONS ; MOLECULAR CLOUDS ; INNER GALAXY ; COLD CORES ; CONTINUUM OBSERVATIONS ; PHYSICAL-PROPERTIES ; EVOLUTIONARY STAGES
收录类别	SCI
语种	英语
WOS记录号	WOS:000383481100003
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/1408]
专题	恒星形成与演化研究团组新疆天文台_射电天文研究室
作者单位	1.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
推荐引用方式 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.