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NEWLY IDENTIFIED EXTENDED GREEN OBJECTS (EGOs) FROM THE SPITZER GLIMPSE II SURVEY. II. MOLECULAR CLOUD ENVIRONMENTS

文献类型：期刊论文

作者Chen, X1,2; Gan, CG1,2; Ellingsen, SP3; He JH(何金华)4; Shen, ZQ1,2; Titmarsh, A3
刊名ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期2013-06
卷号206期号:2
关键词infrared: ISM ISM: jets and outflows radio lines: ISM stars: formation
ISSN号0067-0049
产权排序第四完成单位
通讯作者Chen, X (reprint author), Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China.
英文摘要We have undertaken a survey of molecular lines in the 3 mm band toward 57 young stellar objects using the Australia Telescope National Facility Mopra 22 m radio telescope. The target sources were young stellar objects with active outflows (extended green objects (EGOs)) newly identified from the GLIMPSE II survey. We observe a high detection rate (50%) of broad line wing emission in the HNC and CS thermal lines, which combined with the high detection rate of class I methanol masers toward these sources (reported in Paper I) further demonstrates that the GLIMPSE II EGOs are associated with outflows. The physical and kinematic characteristics derived from the 3 mm molecular lines for these newly identified EGOs are consistent with these sources being massive young stellar objects with ongoing outflow activity and rapid accretion. These findings support our previous investigations of the mid-infrared properties of these sources and their association with other star formation tracers (e. g., infrared dark clouds, methanol masers and millimeter dust sources) presented in Paper I. The high detection rate (64%) of the hot core tracer CH3CN reveals that the majority of these new EGOs have evolved to the hot molecular core stage. Comparison of the observed molecular column densities with predictions from hot core chemistry models reveals that the newly identified EGOs from the GLIMPSE II survey are members of the youngest hot core population, with an evolutionary time scale of the order of 103 yr.
WOS标题词Science & Technology ; Physical Sciences
学科主题Astronomy & Astrophysics
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]MASSIVE STAR-FORMATION ; INFRARED DARK CLOUDS ; MULTIBEAM MASER CATALOG ; YOUNG STELLAR OBJECTS ; GHZ METHANOL MASERS ; HOT-CORE REGIONS ; FORMING REGIONS ; DENSE CORES ; CHEMICAL EVOLUTION ; CH3CN OBSERVATIONS
收录类别SCI
原文出处http://iopscience.iop.org/article/10.1088/0067-0049/206/2/22/meta
语种英语
WOS记录号WOS:000325654800013
源URL[http://ir.ynao.ac.cn/handle/114a53/4552]  
专题云南天文台_大样本恒星演化研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China
2.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing, China
3.School of Mathematics and Physics, University of Tasmania, Hobart, Tasmania, Australia
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Astronomical Observatory/National Astronomical Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, Yunnan Province, China
推荐引用方式
GB/T 7714		 Chen, X,Gan, CG,Ellingsen, SP,et al. NEWLY IDENTIFIED EXTENDED GREEN OBJECTS (EGOs) FROM THE SPITZER GLIMPSE II SURVEY. II. MOLECULAR CLOUD ENVIRONMENTS[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2013,206(2).
APA Chen, X,Gan, CG,Ellingsen, SP,He JH,Shen, ZQ,&Titmarsh, A.(2013).NEWLY IDENTIFIED EXTENDED GREEN OBJECTS (EGOs) FROM THE SPITZER GLIMPSE II SURVEY. II. MOLECULAR CLOUD ENVIRONMENTS.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,206(2).
MLA Chen, X,et al."NEWLY IDENTIFIED EXTENDED GREEN OBJECTS (EGOs) FROM THE SPITZER GLIMPSE II SURVEY. II. MOLECULAR CLOUD ENVIRONMENTS".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 206.2(2013).

入库方式： OAI收割

来源：云南天文台

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