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题名: A 1 mm SPECTRAL LINE SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)
作者: He, J. H.1; Takahashi, S.2; Chen, X.3
刊名: ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期: 2012-09-01
卷号: 202, 期号:1
关键词: ISM: clouds ; ISM: jets and outflows ; ISM: kinematics and dynamics ; radio lines: ISM ; stars: formation ; turbulence
DOI: 10.1088/0067-0049/202/1/1
文章类型: Article
英文摘要: A northern subsample of 89 Spitzer GLIMPSE extended green objects (EGOs), the candidate massive young stellar objects, are surveyed for molecular lines in two 1 GHz ranges: 251.5-252.5 and 260.188-261.188 GHz. A comprehensive catalog of observed molecular line data and spectral plots are presented. Eight molecular species are undoubtedly detected: (HCO+)-C-13, SiO, SO, CH3OH, CH3OCH3, CH3CH2CN, HCOOCH3, and (HNC)-C-13. The (HCO+)-C-13 3-2 line is detected in 70 EGOs, among which 37 also show the SiO 6-5 line, demonstrating their association with dense gas and supporting the outflow interpretation of the extended 4.5 mu m excess emission. Our major dense gas and outflow tracers ((HCO+)-C-13, SiO, SO, and CH3OH) are combined with our previous survey of (CO)-C-13, (CO)-C-12, and (CO)-O-18 1-0 toward the same sample of EGOs for a multi-line, multi-cloud analysis of linewidth and luminosity correlations. Good log-linear correlations are found among all considered line luminosities, the explanation of which requires a universal similarity of density and thermal structures and probably of shock properties among all EGO clouds. It also requires that the shocks be produced within the natal clouds of the EGOs. Diverse degrees of correlation are found among the linewidths. However, both the linewidth and luminosity correlations tend to progressively worsen across larger cloud subcomponent size scales, depicting the increase of randomness across cloud subcomponent sizes. Moreover, the linewidth correlations among the three isotopic CO 1-0 lines show data scatter as linear functions of the linewidth itself, indicating that the velocity randomness also increases with whole cloud sizes in a regular way.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: FAST MOLECULAR SHOCKS ; INFRARED DARK CLOUDS ; MASS STAR-FORMATION ; METHANOL MASERS ; CLASS-I ; INTERSTELLAR SHOCKS ; COLOGNE DATABASE ; HOT CORES ; CHEMISTRY ; EMISSION
收录类别: SCI
语种: 英语
WOS记录号: WOS:000309557300001
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15579
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, Natl Astron Observ, Yunnan Astron Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan Province, Peoples R China
2.Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan
3.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Radio Astron, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
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