PMO OpenIR  > 分子云与恒星形成研究团组
(CO)-C-13, (CO)-O-18, and CS observations toward massive dense cores
Ao, YP; Yang, J; Sunada, K
2004-10-01
Source PublicationASTRONOMICAL JOURNAL
ISSN0004-6256
Volume128Issue:4Pages:1716-1732
AbstractWe present results of (CO)-C-13 J = 1-0, (CO)-O-18 J = 1-0, and CS J = 2-1 map observations toward 10 massive star-forming regions selected from the previous CO line survey of cold IRAS sources along the Galactic plane. CS line emission was detected from 9 out of 10 sources, and (CO)-C-13 line emission was detected in all sources. (CO)-O-18 J = 1-0 line emission was detected in only three sources. Physical parameters are derived for the detected sources. The (CO)-C-13 and (CO)-O-18 data support the idea that gradual dissipation of the internal turbulence leads to formation of denser cores and subsequent star formation. There is no apparent relationship between the CS abundance and the CO temperature. The ratios of L-IR to M-LTE vary by no more than a factor of 3 for the CS cores and by nearly 1 order of magnitude for the (CO)-C-13 cores. This indicates that star formation is determined by the gas with high volume density and does not depend on the mass of the cloud. We find that the star formation rate per unit mass is nearly constant in the dense cores. Divided into two subgroups, "low" and "high," by their FIR color indexes, the low sources are in an earlier stage than the high sources, based on the high sources' association with H2O masers.
KeywordIsm : Clouds Ism : Molecules Stars : Formation
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordH-II REGIONS ; ULTRACOMPACT HII-REGIONS ; LUMINOUS IRAS SOURCES ; SOUTHERN H2O MASERS ; STAR-FORMATION ; MOLECULAR CORES ; PROTOSTELLAR CANDIDATES ; CARBON-MONOXIDE ; POINT SOURCES ; CLOUD MASSES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000224303400021
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/7697
Collection分子云与恒星形成研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Nobeyama Radio Observ, Minamisa Ku, Nagano 3841305, Japan
Recommended Citation
GB/T 7714
Ao, YP,Yang, J,Sunada, K. (CO)-C-13, (CO)-O-18, and CS observations toward massive dense cores[J]. ASTRONOMICAL JOURNAL,2004,128(4):1716-1732.
APA Ao, YP,Yang, J,&Sunada, K.(2004).(CO)-C-13, (CO)-O-18, and CS observations toward massive dense cores.ASTRONOMICAL JOURNAL,128(4),1716-1732.
MLA Ao, YP,et al."(CO)-C-13, (CO)-O-18, and CS observations toward massive dense cores".ASTRONOMICAL JOURNAL 128.4(2004):1716-1732.
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