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Widespread subsonic turbulence in Ophiuchus North 1

文献类型：期刊论文

作者Gong, Yan1; Liu, Shu2; Wang, Junzhi3,4; Zhu, Weishan5; Li, Guang-Xing6; Yang, Wenjin1; Sun, Jixian7,8
刊名ASTRONOMY & ASTROPHYSICS
出版日期2022-07-18
卷号663页码:15
ISSN号0004-6361
关键词ISM: clouds radio lines: ISM ISM: individual objects: OphN1 ISM: kinematics and dynamics ISM: molecules ISM: structure
DOI10.1051/0004-6361/202142713
英文摘要Context. Supersonic motions are common in molecular clouds. (Sub)sonic turbulence is usually detected toward dense cores and filaments. However, it remains unknown whether (sub)sonic motions at larger scales (greater than or similar to 1 pc) may be present in various environments. Aims. Located at a distance of about 110 pc, Ophiuchus North 1 (Oph N1) is one of the nearest molecular clouds that would allow for an in-depth investigation of its turbulence properties via large-scale mapping observations of single-dish telescopes. Methods. We carried out the (CO)-C-12 (J= 1-0) and (CO)-O-18 (J= 1-0) imaging observations toward Oph N1 with the Purple Mountain Observatory 13.7 m telescope. The observations have an angular resolution of similar to 55 '' (i.e., 0.03 pc). Results. Most of the whole (CO)-O-18 emitting regions have Mach numbers of less than or similar to 1, demonstrating the large-scale (sub)sonic turbulence across Oph N1. Based on the polarization measurements, we estimate the magnetic field strength of the plane-of-sky component to be greater than or similar to 9 mu G. We infer that Oph N1 is globally sub-Alfvenic, and is supported against gravity mainly by the magnetic field. The steep velocity structure function can be caused by the expansion of the Sh 2-27 HII region or the dissipative range of incompressible turbulence. Conclusions. Our observations reveal a surprising case of clouds that are characterized by widespread subsonic turbulence and a steep relation between the size and the linewidth. This cloud is magnetized where ion-neutral friction is assumed to play an important role.
WOS关键词DENSE CLOUD CORES ; MAGNETIC-FIELD ; MOLECULAR CLOUDS ; DARK CLOUDS ; INTERSTELLAR TURBULENCE ; VELOCITY DISPERSION ; FILAMENT FORMATION ; STAR-FORMATION ; SIZE RELATION ; GAS
资助项目National Key R&D Program of China[2017YFA0402702] ; NSFC[W820301904] ; NSFC[12033005] ; NSFC[12173102] ; National Aeronautics and Space Administration
WOS研究方向Astronomy & Astrophysics
语种英语
出版者EDP SCIENCES S A
WOS记录号WOS:000826654300006
资助机构National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration
源URL[http://ir.bao.ac.cn/handle/114a11/87785]  
专题中国科学院国家天文台
通讯作者Gong, Yan
作者单位1.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
4.Guangxi Univ, Sch Phys Sci & Technol, Nanning 530004, Peoples R China
5.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai Campus,2 Daxue Rd, Zhuhai 519082, Guangdong, Peoples R China
6.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China
7.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Peoples R China
8.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210034, Peoples R China
推荐引用方式
GB/T 7714		 Gong, Yan,Liu, Shu,Wang, Junzhi,et al. Widespread subsonic turbulence in Ophiuchus North 1[J]. ASTRONOMY & ASTROPHYSICS,2022,663:15.
APA Gong, Yan.,Liu, Shu.,Wang, Junzhi.,Zhu, Weishan.,Li, Guang-Xing.,...&Sun, Jixian.(2022).Widespread subsonic turbulence in Ophiuchus North 1.ASTRONOMY & ASTROPHYSICS,663,15.
MLA Gong, Yan,et al."Widespread subsonic turbulence in Ophiuchus North 1".ASTRONOMY & ASTROPHYSICS 663(2022):15.

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