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CO (J=1-0) Observations toward Filamentary Molecular Clouds in the Galactic Region with l = [169 degrees.75, 174 degrees.75], b = [-0 degrees.75, 0 degrees.5]

文献类型:期刊论文

作者Xiong, Fang1,2,3,4; Chen, Xuepeng1,2,5; Zhang, Qizhou4; Yang, Ji1,2,5; Fang, Min6; Zhang, Miaomiao1,2,7; Guo, Weihua1,2,5; Sun, Li1,2,5
刊名ASTROPHYSICAL JOURNAL
出版日期2019-08-01
卷号880期号:2页码:41
ISSN号0004-637X
关键词ISM: clouds ISM: molecules ISM: structure stars: formation
DOI10.3847/1538-4357/ab2a70
通讯作者Xiong, Fang(fangxiong@pmo.ac.cn)
英文摘要We present observations of the CO isotopologues ((CO)-C-12, (CO)-C-13, and (CO)-O-18) toward the Galactic region with 169 degrees.75 <= l <= 174 degrees.75 and -0 degrees.75 <= b <= 0 degrees.5 using the Purple Mountain Observatory 13.7 m millimeter-wavelength telescope. Based on the (CO)-C-13 (J = 1 - 0) data, we find five molecular clouds within the velocity range between -25 and 8 km s(-1) that are all characterized by conspicuous filamentary structures. We have identified eight filaments with a length of 6.38-28.45 pc, a mean H-2 column density of 0.70 x 10(21)-6.53 x 10(21) cm(-2), and a line mass of 20.24-161.91 M-circle dot pc(-1), assuming a distance of similar to 1.7 kpc. Gaussian fittings to the inner parts of the radial density profiles lead to a mean FWHM width of 1.13 +/- 0.01 pc. The velocity structures of most filaments present continuous distributions with slight velocity gradients. We find that turbulence is the dominant internal pressure to support the fragmentation of filaments instead of thermal pressure. Most filaments have virial parameters smaller than 2; thus, they are gravitationally bound. Four filaments have an LTE line mass close to the virial line mass. We further extract dense clumps using the (CO)-C-13 data and find that 64% of the clumps are associated with the filaments. According to the complementary IR data, most filaments have associated Class II young stellar objects. Class. I objects are mainly found to be located in the filaments with a virial parameter close to 1. Within two virialized filaments, (CO)-C-12 outflows have been detected, indicating ongoing star-forming activity therein.
WOS关键词PHYSICAL-PROPERTIES ; STAR-FORMATION ; DUST RATIO ; FRAGMENTATION ; GAS ; CLUSTERS ; PLANE
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000478778000016
源URL[http://libir.pmo.ac.cn/handle/332002/27112]  
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, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
3.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
4.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
5.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
6.Univ Arizona, Dept Astron, 933 North Cherry Ave, Tucson, AZ 85721 USA
7.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
推荐引用方式
GB/T 7714
Xiong, Fang,Chen, Xuepeng,Zhang, Qizhou,et al. CO (J=1-0) Observations toward Filamentary Molecular Clouds in the Galactic Region with l = [169 degrees.75, 174 degrees.75], b = [-0 degrees.75, 0 degrees.5][J]. ASTROPHYSICAL JOURNAL,2019,880(2):41.
APA Xiong, Fang.,Chen, Xuepeng.,Zhang, Qizhou.,Yang, Ji.,Fang, Min.,...&Sun, Li.(2019).CO (J=1-0) Observations toward Filamentary Molecular Clouds in the Galactic Region with l = [169 degrees.75, 174 degrees.75], b = [-0 degrees.75, 0 degrees.5].ASTROPHYSICAL JOURNAL,880(2),41.
MLA Xiong, Fang,et al."CO (J=1-0) Observations toward Filamentary Molecular Clouds in the Galactic Region with l = [169 degrees.75, 174 degrees.75], b = [-0 degrees.75, 0 degrees.5]".ASTROPHYSICAL JOURNAL 880.2(2019):41.

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来源:紫金山天文台

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