PMO OpenIR
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]
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
2019-08-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume880Issue:2Pages:41
Corresponding AuthorXiong, Fang(fangxiong@pmo.ac.cn)
AbstractWe 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.
KeywordISM: clouds ISM: molecules ISM: structure stars: formation
DOI10.3847/1538-4357/ab2a70
WOS KeywordPHYSICAL-PROPERTIES ; STAR-FORMATION ; DUST RATIO ; FRAGMENTATION ; GAS ; CLUSTERS ; PLANE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000478778000016
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27113
Collection中国科学院紫金山天文台
Corresponding AuthorXiong, Fang
Affiliation1.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
Recommended Citation
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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