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 |
DOI | 10.3847/1538-4357/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. |
入库方式: OAI收割
来源:紫金山天文台
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