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CO (J = 1–0) Observations toward Filamentary Molecular Clouds in the Galactic Region with l?=?[169.°75, 174.°75], b?=?[?0.°75, 0.°5]
Xiong,Fang1,2,3; Chen,Xuepeng1,4; Zhang,Qizhou3; Yang,Ji1,4; Fang,Min5; Zhang,Miaomiao1,6; Guo,Weihua1,4; Sun,Li1,4
2019-07-30
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume880Issue:2
AbstractAbstract We present observations of the CO isotopologues (12CO, 13CO, and C18O) toward the Galactic region with 169.°75?≤?l?≤?174.°75 and ?0.°75?≤?b?≤?0.°5 using the Purple Mountain Observatory 13.7 m millimeter-wavelength telescope. Based on the 13CO?(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 H2 column density of 0.70?×?1021–6.53?×?1021?cm?2, and a line mass of 20.24–161.91?M☉ pc?1, assuming a distance of ~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 13CO 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, 12CO outflows have been detected, indicating ongoing star-forming activity therein.
KeywordISM: clouds ISM: molecules ISM: structure stars: formation
DOI10.3847/1538-4357/ab2a70
Language英语
WOS IDIOP:0004-637X-880-2-ab2a70
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27484
Collection中国科学院紫金山天文台
Affiliation1.Purple Mountain Observatory, and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 8 Yuanhua Road, Nanjing 210034, People’s Republic of China; fangxiong@pmo.ac.cn, xpchen@pmo.ac.cn
2.University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing 100049, People’s Republic of China
3.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
4.School of Astronomy and Space Science, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
5.Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
6.Max-Planck-Institut für Astronomie, K?nigstuhl 17, D-69117 Heidelberg, Germany
Recommended Citation
GB/T 7714
Xiong,Fang,Chen,Xuepeng,Zhang,Qizhou,等. CO (J = 1–0) Observations toward Filamentary Molecular Clouds in the Galactic Region with l?=?[169.°75, 174.°75], b?=?[?0.°75, 0.°5][J]. The Astrophysical Journal,2019,880(2).
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.°75, 174.°75], b?=?[?0.°75, 0.°5].The Astrophysical Journal,880(2).
MLA Xiong,Fang,et al."CO (J = 1–0) Observations toward Filamentary Molecular Clouds in the Galactic Region with l?=?[169.°75, 174.°75], b?=?[?0.°75, 0.°5]".The Astrophysical Journal 880.2(2019).
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