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NEWLY IDENTIFIED EXTENDED GREEN OBJECTS (EGOs) FROM THE SPITZER GLIMPSE II SURVEY. II. MOLECULAR CLOUD ENVIRONMENTS
Chen, X1,2; Gan, CG1,2; Ellingsen, SP3; He JH(何金华)4; Shen, ZQ1,2; Titmarsh, A3
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2013-06
Volume206Issue:2
DOI10.1088/0067-0049/206/2/22
Contribution Rank第4完成单位
Indexed BySCI
KeywordInfrared: Ism Ism: Jets And Outflows Radio Lines: Ism Stars: Formation
Abstract

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.

Funding ProjectChina Ministry of Science and Technology ; State Key Development Program for Basic Research[2012CB821800] ; National Natural Science Foundation of China[11073041] ; National Natural Science Foundation of China[11133008] ; National Natural Science Foundation of China[11273043] ; CAS/SAFEA International Partnership Program for Creative Research Teams ; Key Laboratory for Radio Astronomy, CAS
Funding OrganizationChina Ministry of Science and Technology ; State Key Development Program for Basic Research[2012CB821800] ; National Natural Science Foundation of China[11073041, 11133008, 11273043] ; CAS/SAFEA International Partnership Program for Creative Research Teams ; Key Laboratory for Radio Astronomy, CAS
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0067-0049
URL查看原文
WOS IDWOS:000325654800013
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMASSIVE 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
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/4552
Collection大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorChen, X
Affiliation1.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
Recommended Citation
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).
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