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KOSMA (CO)-C-12(2-1) and (3-2) observations toward Infrared Dark Clouds
Li, Dalei1,2; Esimbek, Jarken1,3; Zhou, Jianjun1,3; Baan, Willem4; Wu, Gang1,3; Tang, Xindi1,3,5; Ji, Weiguang1,3; Yuan, Ye1,3; He, Yuxin1,2; Komesh, Toktarkhan6
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Infrared Dark Clouds (IRDCs) are a valuable sample to study the initial conditions and the very early stages of the evolution of massive stars. Using the KOSMA telescope, we performed simultaneous single point (CO)-C-12(2-1) and (3-2) observations toward 117 IRDCs with a detection rate of 74 % for (CO)-C-12(2-1) and 58 % for (CO)-C-12(3-2). The non-detected sources are found not to represent real dark clouds. The distances of the IRDCs have been calculated using a Bayesian distance estimator indicating that the sources are mainly concentrated in the Outer, Perseus, Local, Sagittarius and Scutum arms. The excitation temperature and the filling factor have been solved simultaneously for the two emission lines. The average excitation temperature is about 10 K. The filling factors are used to correct the integrated intensity ratio of (CO)-C-12(3-2) to (2-1) resulting in a typical value of the ratio of 0.69 +/- 0.47 for the majority of sources. A small number of sources exhibit enhanced values for the ratio because of the presence of a nearby HII region. The ratios do not show significant differences for sources with embedded far-infrared sources.

Correspondent Emaillidalei@xao.ac.cn
KeywordInfrared: Ism Ism: Molecules Submillimeter: Ism Star: Formation
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS KeywordStar-formation ; Milky-way ; Molecular Cloud ; Cores ; Clumps ; Kinematics ; Fragmentation ; Population ; Excitation ; (Co)-o-18
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000379003700016
Funding OrganizationNational Natural Science foundation of China(11433008 ; National Basic Research Program of China (973 program)(2012CB821802) ; Program of the Light in China's Western Region(RCPY201202 ; National Aeronautics and Space Administration ; 11373062 ; XBBS-2014-24) ; 11303081)
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLi, Dalei
Affiliation1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100080, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China
4.Netherlands Inst Radio Astron ASTRON, NL-7991 PD Dwingeloo, Netherlands
5.Max Planck Inst Radioastron, D-53121 Bonn, Germany
6.AL Farabi Kazakh Natl Univ, Fac Phys & Technol, Dept Solid State Phys & Nonlinear Phys, Alma Ata 050040, Kazakhstan
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Corresponding Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li, Dalei,Esimbek, Jarken,Zhou, Jianjun,et al. KOSMA (CO)-C-12(2-1) and (3-2) observations toward Infrared Dark Clouds[J]. ASTROPHYSICS AND SPACE SCIENCE,2016,361(7):220.
APA Li, Dalei.,Esimbek, Jarken.,Zhou, Jianjun.,Baan, Willem.,Wu, Gang.,...&Komesh, Toktarkhan.(2016).KOSMA (CO)-C-12(2-1) and (3-2) observations toward Infrared Dark Clouds.ASTROPHYSICS AND SPACE SCIENCE,361(7),220.
MLA Li, Dalei,et al."KOSMA (CO)-C-12(2-1) and (3-2) observations toward Infrared Dark Clouds".ASTROPHYSICS AND SPACE SCIENCE 361.7(2016):220.
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