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A 1 mm SPECTRAL LINE SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)
He, J. H.1; Takahashi, S.2; Chen, X.3
2012-09-01
发表期刊ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
卷号202期号:1
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.
文章类型Article
关键词Ism: Clouds Ism: Jets And Outflows Ism: Kinematics And Dynamics Radio Lines: Ism Stars: Formation Turbulence
WOS标题词Science & Technology ; Physical Sciences
DOI10.1088/0067-0049/202/1/1
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研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000309557300001
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/15569
专题暗物质和空间天文实验室
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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He, J. H.,Takahashi, S.,Chen, X.. A 1 mm SPECTRAL LINE SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2012,202(1).
APA He, J. H.,Takahashi, S.,&Chen, X..(2012).A 1 mm SPECTRAL LINE SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs).ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,202(1).
MLA He, J. H.,et al."A 1 mm SPECTRAL LINE SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 202.1(2012).
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