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Chinese Academy of Sciences Institutional Repositories Grid
CO(J=1-0) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at l=150 degrees, b=3 degrees.5

文献类型:期刊论文

作者Xiong, Fang1,2,3; Chen, Xuepeng1,2; Yang, Ji1,2; Fang, Min1,2; Zhang, Shaobo1,2; Zhang, Miaomiao1,2; Du, Xinyu1,2,3; Long, Wenshan1,2,4
刊名ASTROPHYSICAL JOURNAL
出版日期2017-03-20
卷号838期号:1页码:24
关键词ISM: clouds ISM: molecules ISM: structure stars: formation
ISSN号0004-637X
DOI10.3847/1538-4357/aa6443
英文摘要

We present large-field (4.25 x 3.75 deg(2)) mapping observations toward the Galactic region centered at l = 150 degrees, b = 3 degrees.5 in the J = 1-0 emission line of CO isotopologues ((CO)-C-12, (CO)-C-13, and (CO)-O-18), using the 13.7 m millimeter-wavelength telescope of the Purple Mountain Observatory. Based on the (CO)-C-13 observations, we reveal a filamentary cloud in the Local Arm at a velocity range of -0.5 to 6.5 km s(-1). This molecular cloud contains 1 main filament and 11 sub-filaments, showing the so-called "ridge-nest" structure. The main filament and three sub-filaments are also detected in the (CO)-O-18 line. The velocity structures of most identified filaments display continuous distribution with slight velocity gradients. The measured median excitation temperature, line width, length, width, and linear mass of the filaments are similar to 9.28 K, 0.85 km s(-1), 7.30 pc, 0.79 pc, and 17.92 M-circle dot pc(-1), respectively, assuming a distance of 400 pc. We find that the four filaments detected in the (CO)-O-18 line are thermally supercritical, and two of them are in the virialized state, and. thus tend to be gravitationally bound. We identify in total 146 (CO)-C-13 clumps in the cloud, about 77% of the clumps are distributed along the filaments. About 56% of the virialized clumps are found to be associated with the supercritical filaments. Three young stellar object candidates are also identified in the supercritical filaments, based on the complementary infrared data. These results indicate that the supercritical filaments, especially the virialized filaments, may contain star-forming activities.

WOS关键词PERSISTENT COSMIC WEB ; INFRARED-DARK CLOUD ; GOULD BELT SURVEY ; STAR-FORMATION ; MILKY-WAY ; INTERSTELLAR FILAMENTS ; PHYSICAL-PROPERTIES ; OUTER GALAXY ; CO SURVEY ; HERSCHEL
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000401174300001
出版者IOP PUBLISHING LTD
源URL[http://libir.pmo.ac.cn/handle/332002/23075]  
专题中国科学院紫金山天文台
通讯作者Xiong, Fang
作者单位1.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
4.Shanghai Normal Univ, 100 Guilin Rd, Shanghai 200234, Peoples R China
推荐引用方式
GB/T 7714
Xiong, Fang,Chen, Xuepeng,Yang, Ji,et al. CO(J=1-0) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at l=150 degrees, b=3 degrees.5[J]. ASTROPHYSICAL JOURNAL,2017,838(1):24.
APA Xiong, Fang.,Chen, Xuepeng.,Yang, Ji.,Fang, Min.,Zhang, Shaobo.,...&Long, Wenshan.(2017).CO(J=1-0) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at l=150 degrees, b=3 degrees.5.ASTROPHYSICAL JOURNAL,838(1),24.
MLA Xiong, Fang,et al."CO(J=1-0) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at l=150 degrees, b=3 degrees.5".ASTROPHYSICAL JOURNAL 838.1(2017):24.

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来源:紫金山天文台

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