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CO(J?=?1–0) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at l?=?150°, b?=?3.°5
Xiong,Fang1,2; Chen,Xuepeng1; Yang,Ji1; Fang,Min1; Zhang,Shaobo1; Zhang,Miaomiao1; Du,Xinyu1,2; Long,Wenshan1,3
2017-03-23
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume838Issue:1
AbstractAbstract We present large-field (4.25?×?3.75 deg2) mapping observations toward the Galactic region centered at in the J?=?1–0 emission line of CO isotopologues (12CO, 13CO, and C18O), using the 13.7 m millimeter-wavelength telescope of the Purple Mountain Observatory. Based on the 13CO 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 C18O 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 ~9.28?K, 0.85 km s?1, 7.30?pc, 0.79?pc, and 17.92? pc?1, respectively, assuming a distance of 400?pc. We find that the four filaments detected in the C18O 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 13CO 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.
KeywordISM: clouds ISM: molecules ISM: structure stars: formation
DOI10.3847/1538-4357/aa6443
Language英语
WOS IDIOP:0004-637X-838-1-aa6443
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23770
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, 2 West Beijing Road,Nanjing 210008, China; fangxiong@pmo.ac.cn, xpchen@pmo.ac.cn
2.University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing 100049, China
3.Shanghai Normal University, 100 Guilin Road, Xuhui District, Shanghai 200234, China
Recommended Citation
GB/T 7714
Xiong,Fang,Chen,Xuepeng,Yang,Ji,等. CO(J?=?1–0) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at l?=?150°, b?=?3.°5[J]. The Astrophysical Journal,2017,838(1).
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°, b?=?3.°5.The Astrophysical Journal,838(1).
MLA Xiong,Fang,et al."CO(J?=?1–0) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at l?=?150°, b?=?3.°5".The Astrophysical Journal 838.1(2017).
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