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A Large-scale (CO)-C-12, (CO)-C-13, and (CO)-O-18 Molecular Cloud Survey in the Outer Galactic Plane over I = [12975,14025] and b = [-525,+525]
Sun, Yan1; Yang, Ji; Xu, Ye; Zhang, Shaobo; Su, Yang; Wang, Hongchi; Chen, Xue-Peng; Lu, Deng-Rong; Sun, Ji-Xian; Ju, Bing-Gang; Zhang, Yong-Xing; Zhou, Xin; Jiang, Zhi-Bo
2020
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
ISSN0067-0049
Volume246Issue:1Pages:20
Corresponding AuthorSun, Yan(yansun@pmo.ac.cn)
AbstractWe present the data of an unbiased J = 1-0 (CO)-C-12/(CO)-C-13/(CO)-O-18 survey of molecular clouds in the Galactic plane over l = [12975, 14025] and b = [-525, +525]. For the full 105 x 105 region sampled at 30 '', there are 1,590,120 spectra for each isotopologue. The high sensitivity and large spatial dynamic range of the maps provide valuable insights into the structure, physical properties, and kinematics of the molecular gas. The new data successfully trace the most distant spiral arm, as well as the internal subfeatures of the nearby spiral arms. The combined data set of (CO)-C-12, (CO)-C-13, and (CO)-O-18 allows us to make a more accurate inventory of gas column density and mass for molecular gas within this Galactic interval than hitherto attempted. A statistical analysis reveals that a large fraction of the observed molecular gas is emitted from regions with low excitation conditions. As expected, a considerable amount of H-2 mass is found to be confined to the spiral arms. Moreover, we find that the (CO)-O-18 emission is exclusively seen along spiral arms at current detection limits. The physical properties of molecular gas vary considerably in different spiral arms and inter-arms. We find that the column density probability density functions and the amount of relatively denser gas (traced by (CO)-C-13 or (CO)-O-18) appear to be closely related to the level of massive star formation activity within the molecular gas. The high-quality data also reveal that the warp and flare of the Galactic plane become obvious beyond the Perseus arm in this Galactic longitude range.
KeywordGalaxy structure Interstellar medium Star formation Molecular clouds Surveys CO line emission
DOI10.3847/1538-4365/ab5b97
WOS KeywordH2O MASER SOURCES ; MILKY-WAY ; METHANOL MASERS ; STAR-FORMATION ; WATER MASERS ; CO SURVEY ; SPIRAL STRUCTURE ; ARCETRI CATALOG ; IRAS SOURCES ; GAS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000506394000001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/36621
Collection中国科学院紫金山天文台
Corresponding AuthorSun, Yan
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Sun, Yan,Yang, Ji,Xu, Ye,et al. A Large-scale (CO)-C-12, (CO)-C-13, and (CO)-O-18 Molecular Cloud Survey in the Outer Galactic Plane over I = [12975,14025] and b = [-525,+525][J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2020,246(1):20.
APA Sun, Yan.,Yang, Ji.,Xu, Ye.,Zhang, Shaobo.,Su, Yang.,...&Jiang, Zhi-Bo.(2020).A Large-scale (CO)-C-12, (CO)-C-13, and (CO)-O-18 Molecular Cloud Survey in the Outer Galactic Plane over I = [12975,14025] and b = [-525,+525].ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,246(1),20.
MLA Sun, Yan,et al."A Large-scale (CO)-C-12, (CO)-C-13, and (CO)-O-18 Molecular Cloud Survey in the Outer Galactic Plane over I = [12975,14025] and b = [-525,+525]".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 246.1(2020):20.
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