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CO(J=1-0) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at l=150 degrees, b=3 degrees.5
Xiong, Fang1,2,3; Chen, Xuepeng1,2; Yang, Ji1,2; Fang, Min1,2; Zhang, Shaobo1,2; Zhang, Miaomiao1,2; Du, Xinyu1,2,3; Long, Wenshan1,2,4
2017-03-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume838Issue:1Pages:24
Corresponding AuthorXiong, Fang(fangxiong@pmo.ac.cn)
AbstractWe present large-field (4.25 x 3.75 deg(2)) mapping observations toward the Galactic region centered at l = 150 degrees, b = 3 degrees.5 in the J = 1-0 emission line of CO isotopologues ((CO)-C-12, (CO)-C-13, and (CO)-O-18), using the 13.7 m millimeter-wavelength telescope of the Purple Mountain Observatory. Based on the (CO)-C-13 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 (CO)-O-18 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 similar to 9.28 K, 0.85 km s(-1), 7.30 pc, 0.79 pc, and 17.92 M-circle dot pc(-1), respectively, assuming a distance of 400 pc. We find that the four filaments detected in the (CO)-O-18 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 (CO)-C-13 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
WOS KeywordPERSISTENT COSMIC WEB ; INFRARED-DARK CLOUD ; GOULD BELT SURVEY ; STAR-FORMATION ; MILKY-WAY ; INTERSTELLAR FILAMENTS ; PHYSICAL-PROPERTIES ; OUTER GALAXY ; CO SURVEY ; HERSCHEL
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000401174300001
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23076
Collection中国科学院紫金山天文台
Corresponding AuthorXiong, Fang
Affiliation1.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
4.Shanghai Normal Univ, 100 Guilin Rd, Shanghai 200234, Peoples R China
Recommended Citation
GB/T 7714
Xiong, Fang,Chen, Xuepeng,Yang, Ji,et al. CO(J=1-0) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at l=150 degrees, b=3 degrees.5[J]. ASTROPHYSICAL JOURNAL,2017,838(1):24.
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 degrees, b=3 degrees.5.ASTROPHYSICAL JOURNAL,838(1),24.
MLA Xiong, Fang,et al."CO(J=1-0) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at l=150 degrees, b=3 degrees.5".ASTROPHYSICAL JOURNAL 838.1(2017):24.
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