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NEWLY IDENTIFIED EXTENDED GREEN OBJECTS (EGOs) FROM THE SPITZER GLIMPSE II SURVEY. II. MOLECULAR CLOUD ENVIRONMENTS
Chen, Xi1,2; Gan, Cong-Gui1,2; Ellingsen, Simon P.3; He, Jin-Hua4; Shen, Zhi-Qiang1,2; Titmarsh, Anita3; Chen,X
2013-06-01
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
ISSN0067-0049
Volume206Issue:2
AbstractWe 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.
KeywordInfrared: Ism Ism: Jets And Outflows Radio Lines: Ism Stars: Formation
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0067-0049/206/2/22
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
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000325654800013
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10103
Collection期刊(老文献)
Corresponding AuthorChen,X
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing, Jiangsu, Peoples R China
3.Univ Tasmania, Sch Math & Phys, Hobart, Tas, Australia
4.Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan Province, Peoples R China
Recommended Citation
GB/T 7714
Chen, Xi,Gan, Cong-Gui,Ellingsen, Simon P.,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, Xi.,Gan, Cong-Gui.,Ellingsen, Simon P..,He, Jin-Hua.,Shen, Zhi-Qiang.,...&Chen,X.(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, Xi,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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