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题名: EVOLUTION OF OH AND CO-DARK MOLECULAR GAS FRACTION ACROSS A MOLECULAR CLOUD BOUNDARY IN TAURUS
作者: Xu, Duo1, 2; Li, Di1, 3; Yue, Nannan1, 2; Goldsmith, Paul F.4
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016-03-01
卷号: 819, 期号:1
关键词: evolution ; ISM: clouds ; ISM: individual objects (Taurus) ; ISM: molecules
DOI: 10.3847/0004-637X/819/1/22
文章类型: Article
英文摘要: We present observations of (CO)-C-12 J = 1-0, (CO)-C-13 J = 1-0, H I, and all four ground-state transitions of the hydroxyl (OH) radical toward a sharp boundary region of the Taurus molecular cloud. Based on a photodissociation region (PDR) model that reproduces CO and [C I] emission from the same region, we modeled the three OH transitions, 1612, 1665, and 1667 MHz successfully through escape probability non-local thermal equilibrium radiative transfer model calculations. We could not reproduce the 1720 MHz observations, due to unmodeled pumping mechanisms, of which the most likely candidate is a C-shock. The abundance of OH and CO-dark molecular gas is well-constrained. The OH abundance [OH]/[H-2] decreases from 8 x 10(-7) to 1 x 10(-7) as A, increases from 0.4 to 2.7 mag following an empirical law:
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: INTERSTELLAR DUST CLOUDS ; DIFFUSE CLOUDS ; MAGNETOHYDRODYNAMIC SHOCKS ; LINE EMISSION ; EXCITATION ; COLLISIONS ; HYDROGEN ; MASERS ; RATIO ; CH
收录类别: SCI
项目资助者: China Ministry of Science and Technology under State Key Development Program for Basic Research (973 program)(2012CB821802) ; National Natural Science Foundation of China(11373038 ; Chinese Academy of Sciences(XDB09010302) ; Guizhou Scientific Collaboration Program(20130421) ; 11373045)
语种: 英语
WOS记录号: WOS:000372303400022
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16175
Appears in Collections:太阳活动的多波段观测研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100012, Peoples R China
4.CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
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