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题名: Early-stage star-forming cloud cores in Galactic Legacy Infrared Mid-Plane Survey (GLIMPSE) extended green objects (EGOs) as traced by organic species
作者: Ge, J. X.1, 2; He, J. H.1; Chen, X.3, 4; Takahashi, S.5, 6, 7
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2014-12-01
卷号: 445, 期号:2, 页码:1170-1185
关键词: astrochemistry ; ISM: abundances ; ISM: clouds ; ISM: evolution ; ISM: molecules ; submillimetre: ISM
DOI: 10.1093/mnras/stu1758
文章类型: Article
英文摘要: In order to investigate the physical and chemical properties of massive star-forming cores in the early stages, we analyse the excitation and abundance of four organic species, CH3OH, CH3OCH3, HCOOCH3 and CH3CH2CN, towards 29 extended green object (EGO) cloud cores that were observed by our previous single-dish spectral line survey. The EGO cloud cores are found to have similar methanol J(3)-J(2) rotation temperatures of similar to 44 K, a typical linear size of similar to 0.036 pc and a typical beam-averaged methanol abundance of several 10(-9) (the beam-corrected value could reach several 10(-7)). The abundances of the latter three species, normalized by that of methanol, are also found to be correlated across a large variety of clouds such as EGO cloud cores, hot corinos, massive hot cores and Galactic Centre clouds. The chemical properties of the EGO cloud cores lie between those of hot cores and hot corinos. However, the abundances and abundance ratios of the four species cannot be explained satisfactorily by recent chemical models, either among EGO cloud cores or among the various types of cloud core from literature.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: MOLECULAR CLOUDS ; DARK CLOUDS ; HOT-CORE ; CLASS-I ; MASSIVE STARS ; INITIAL CONDITIONS ; COLOGNE DATABASE ; METHANOL MASERS ; HIGH-RESOLUTION ; SAGITTARIUS B2
收录类别: SCI
语种: 英语
WOS记录号: WOS:000346959400008
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15685
Appears in Collections:暗物质和空间天文实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Yunnan Observ, Kunming 650011, Yunnan Province, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
5.Joint ALMA Observ, Santiago, Chile
6.Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
7.Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan
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