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OH Survey along Sightlines of Galactic Observations of Terahertz C
Tang, Ningyu1,2; Li, Di1,2,3; Heiles, Carl4; Yue, Nannan1,2; Dawson, J. R.5,6,7; Goldsmith, Paul F.8; Krco, Marko1; McClure-Griffiths, N. M.9; Wang, Shen1,2; Zuo, Pei1,2; Pineda, Jorge L.9; Wang, Jun-Jie1
2017-04-10
Source PublicationASTROPHYSICAL JOURNAL
Volume839Issue:1
AbstractWe have obtained OH spectra of four transitions in the (2)Pi(3/2) ground state, at 1612, 1665, 1667, and 1720 MHz, toward 51 sightlines that were observed in the Herschel project Galactic Observations of Terahertz C+. The observations cover the longitude range of (32 degrees, 64 degrees) and (189 degrees, 207 degrees) in the northern Galactic plane. All of the diffuse OH emissions conform to the so-called "Sum Rule" of the four brightness temperatures, indicating optically thin emission conditions for OH from diffuse clouds in the Galactic plane. The column densities of the H I "halos" N(H-I) surrounding molecular clouds increase monotonically with OH column density, N(OH), until saturating when N(H-I)= 1.0 x 10(21) cm(-2) and N(OH) >= 4.5 x 10(15) cm(-2), indicating the presence of molecular gas that cannot be traced by H I. Such a linear correlation, albeit weak, is suggestive of H (I) halos' contribution to the UV shielding required for molecular formation. About 18% of OH clouds have no associated CO emission (CO-dark) at a sensitivity of 0.07 K, but are associated with C+ emission. A weak correlation exists between C+ intensity and OH column density for CO-dark molecular clouds. These results imply that OH seems to be a better tracer of molecular gas than CO in diffuse molecular regions.
SubtypeArticle
KeywordEvolution Ism: Clouds Ism: Molecules
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationInternational Partnership Program of the Chinese Academy of Sciences(114A11KYSB20160008) ; International Partnership Program of the Chinese Academy of Sciences(114A11KYSB20160008) ; National Natural Science Foundation of China(11373038) ; National Natural Science Foundation of China(11373038) ; National Key Basic Research Program of China (973 Program), the China Ministry of Science(2015CB857100) ; National Key Basic Research Program of China (973 Program), the China Ministry of Science(2015CB857100) ; "CAS Interdisciplinary Innovation Team" program ; "CAS Interdisciplinary Innovation Team" program ; Australian Research Council(FT150100024) ; Australian Research Council(FT150100024) ; International Partnership Program of the Chinese Academy of Sciences(114A11KYSB20160008) ; International Partnership Program of the Chinese Academy of Sciences(114A11KYSB20160008) ; National Natural Science Foundation of China(11373038) ; National Natural Science Foundation of China(11373038) ; National Key Basic Research Program of China (973 Program), the China Ministry of Science(2015CB857100) ; National Key Basic Research Program of China (973 Program), the China Ministry of Science(2015CB857100) ; "CAS Interdisciplinary Innovation Team" program ; "CAS Interdisciplinary Innovation Team" program ; Australian Research Council(FT150100024) ; Australian Research Council(FT150100024)
DOI10.3847/1538-4357/aa67e9
WOS KeywordINTERSTELLAR DUST CLOUDS ; NARROW SELF-ABSORPTION ; DARK MOLECULAR GAS ; WARM NEUTRAL HALOS ; MILKY-WAY ; H-I ; EMISSION ; GALAXY ; HYDROXYL ; CORES
Indexed BySCI
Language英语
Funding OrganizationInternational Partnership Program of the Chinese Academy of Sciences(114A11KYSB20160008) ; International Partnership Program of the Chinese Academy of Sciences(114A11KYSB20160008) ; National Natural Science Foundation of China(11373038) ; National Natural Science Foundation of China(11373038) ; National Key Basic Research Program of China (973 Program), the China Ministry of Science(2015CB857100) ; National Key Basic Research Program of China (973 Program), the China Ministry of Science(2015CB857100) ; "CAS Interdisciplinary Innovation Team" program ; "CAS Interdisciplinary Innovation Team" program ; Australian Research Council(FT150100024) ; Australian Research Council(FT150100024) ; International Partnership Program of the Chinese Academy of Sciences(114A11KYSB20160008) ; International Partnership Program of the Chinese Academy of Sciences(114A11KYSB20160008) ; National Natural Science Foundation of China(11373038) ; National Natural Science Foundation of China(11373038) ; National Key Basic Research Program of China (973 Program), the China Ministry of Science(2015CB857100) ; National Key Basic Research Program of China (973 Program), the China Ministry of Science(2015CB857100) ; "CAS Interdisciplinary Innovation Team" program ; "CAS Interdisciplinary Innovation Team" program ; Australian Research Council(FT150100024) ; Australian Research Council(FT150100024)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000399122600004
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8389
Collection射电天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
4.Univ Calif Berkeley, Dept Astron, 601 Campbell Hall 3411, Berkeley, CA 94720 USA
5.Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia
6.Macquarie Univ, MQ Res Ctr Astron Astrophys & Astrophoton, N Ryde, NSW 2109, Australia
7.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia
8.CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
9.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
Recommended Citation
GB/T 7714
Tang, Ningyu,Li, Di,Heiles, Carl,et al. OH Survey along Sightlines of Galactic Observations of Terahertz C[J]. ASTROPHYSICAL JOURNAL,2017,839(1).
APA Tang, Ningyu.,Li, Di.,Heiles, Carl.,Yue, Nannan.,Dawson, J. R..,...&Wang, Jun-Jie.(2017).OH Survey along Sightlines of Galactic Observations of Terahertz C.ASTROPHYSICAL JOURNAL,839(1).
MLA Tang, Ningyu,et al."OH Survey along Sightlines of Galactic Observations of Terahertz C".ASTROPHYSICAL JOURNAL 839.1(2017).
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