KOSMA (CO)-C-12(2-1) and (3-2) observations toward Infrared Dark Clouds
文献类型：期刊论文
| 作者 | 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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| 刊名 | ASTROPHYSICS AND SPACE SCIENCE
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| 出版日期 | 2016-07-01 |
| 卷号 | 361期号:7 |
| 关键词 | Infrared: ISM ISM: molecules Submillimeter: ISM Star: formation |
| ISSN号 | 0004-640X |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | STAR-FORMATION ; MILKY-WAY ; MOLECULAR CLOUD ; CORES ; CLUMPS ; KINEMATICS ; FRAGMENTATION ; POPULATION ; EXCITATION ; (CO)-O-18 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000379003700016 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/1403]  |
| 专题 | 恒星形成与演化研究团组 新疆天文台_射电天文研究室 |
| 作者单位 | 1.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 |
| 推荐引用方式 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). |
| 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). |
| 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). |
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来源：新疆天文台
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