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Independent Core Rotation in Massive Filaments in Orion

文献类型：期刊论文

作者Xu, Xuefang1,5; Li, Di1,4,5; Dai, Y. Sophia3; Fuller, Gary A.2; Yue, Nannan1,5
刊名ASTROPHYSICAL JOURNAL LETTERS
出版日期2020-05-01
卷号894期号:2页码:6
关键词Interstellar medium Interstellar filaments Interstellar clouds Interstellar dynamics Interstellar molecules
ISSN号2041-8205
DOI10.3847/2041-8213/ab8ad7
英文摘要We present high-angular-resolution Atacama Large Millimeter/submillimeter Array images of N2H+ (1-0) that have been combined with those from the Nobeyama telescope toward the Orion Molecular Cloud (OMC)-2 and OMC-3 filamentary regions. The filaments (with typical widths of similar to 0.1 pc) and dense cores are resolved. The measured 2D velocity gradients of cores are between 1.3 and 16.7 km s(-1) pc(-1), corresponding to a specific angular momentum (J/M) between 0.0012 and 0.016 pc km s(-1). With respect to the core size R, the specific angular momentum follows a power law J/M proportional to R-1.520.14. The ratio (beta) between the rotational energy and gravitational energy ranges from 0.00041 to 0.094, indicating insignificant support from rotation against gravitational collapse. We further focus on the alignment between the cores' rotational axes, which is defined to be perpendicular to the direction of the velocity gradient ((G)), and the direction of elongation of filaments ((f)) in this massive star-forming region. The distribution of the angle between (f) and (G) was found to be random, i.e., the cores' rotational axes have no discernible correlation with the elongation of their hosting filament. This implies that, in terms of angular momentum, the cores have evolved to be dynamically independent from their natal filaments.
WOS关键词DENSE CORES ; STARLESS CORES ; DARK CLOUDS ; INTERNAL STRUCTURE ; MOLECULAR CLOUD ; EVOLUTION ; N2H+ ; KINEMATICS ; TURBULENCE ; ACCRETION
资助项目National Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11725313] ; National Natural Science Foundation of China[11721303] ; International Partnership Program of Chinese Academy of Sciences[114A11KYSB20160008]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000533541300001
出版者IOP PUBLISHING LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences
源URL[http://ir.bao.ac.cn/handle/114a11/54985]  
专题中国科学院国家天文台
通讯作者Li, Di
作者单位1.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab FAST, Beijing 100101, Peoples R China
2.Univ Manchester, Jodrell Bank Ctr Astrophys, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England
3.Chinese Acad Sci, South Amer Ctr Astron CASSACA, NAOC, Beijing 100101, Peoples R China
4.Univ KwaZulu Natal, NAOC UKZN Computat Astrophys Ctr, Durban 4000, South Africa
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Xu, Xuefang,Li, Di,Dai, Y. Sophia,et al. Independent Core Rotation in Massive Filaments in Orion[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,894(2):6.
APA Xu, Xuefang,Li, Di,Dai, Y. Sophia,Fuller, Gary A.,&Yue, Nannan.(2020).Independent Core Rotation in Massive Filaments in Orion.ASTROPHYSICAL JOURNAL LETTERS,894(2),6.
MLA Xu, Xuefang,et al."Independent Core Rotation in Massive Filaments in Orion".ASTROPHYSICAL JOURNAL LETTERS 894.2(2020):6.

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来源：国家天文台

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