GAS EMISSIONS IN PLANCK COLD DUST CLUMPS-A SURVEY OF THE J=1-0 TRANSITIONS OF (CO)-C-12, (CO)-C-13, AND (CO)-O-18
文献类型：期刊论文
| 作者 | Wu, Yuefang1; Liu, Tie1; Meng, Fanyi2; Li, Di3,4,5 ; Qin, Sheng-Li6; Ju, Bing-Gang7,8
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2012-09-01 |
| 卷号 | 756期号:1 |
| 关键词 | dust, extinction ISM: clouds ISM: kinematics and dynamics ISM: structure stars: formation stars: protostars |
| 英文摘要 | A survey toward 674 Planck cold clumps of the Early Cold Core Catalogue (ECC) in the J = 1-0 transitions of (CO)-C-12, (CO)-C-13, and (CO)-O-18 has been carried out using the Purple Mountain Observatory 13.7 m telescope. Six hundred seventy-three clumps were detected with (CO)-C-12 and (CO)-C-13 emission, and 68% of the sample has (CO)-O-18 emission. Additional velocity components were also identified. A close consistency of the three line peak velocities was revealed for the first time. Kinematic distances are given for all the velocity components, and half of the clumps are located within 0.5 and 1.5 kpc. Excitation temperatures range from 4 to 27 K, slightly larger than those of T-d. Line width analysis shows that the majority of ECC clumps are low-mass clumps. Column densities N-H2 span from 10(20) to 4.5 x 10(22) cm(-2) with an average value of (4.4 +/- 3.6) x 10(21) cm(-2). N-H2 cumulative fraction distribution deviates from the lognormal distribution, which is attributed to optical depth. The average abundance ratio of the (CO)-C-13 to (CO)-O-18 in these clumps is 7.0 +/- 3.8, higher than the terrestrial value. Dust and gas are well coupled in 95% of the clumps. Blue profile asymmetry, red profile asymmetry, and total line asymmetry were found in less than 10% of the clumps, generally indicating that star formation is not yet developed. Ten clumps were mapped. Twelve velocity components and 22 cores were obtained. Their morphologies include extended diffuse, dense, isolated, cometary, and filament, of which the last is the majority. Twenty cores are starless, and only seven cores seem to be in a gravitationally bound state. Planck cold clumps are the most quiescent among the samples of weak red IRAS, infrared dark clouds, UC H II candidates, extended green objects, and methanol maser sources, suggesting that Planck cold clumps have expanded the horizon of cold astronomy. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000309044300076 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6069]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 2.Peking Univ, Yuan Pei Sch, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China 4.Space Sci Inst, Boulder, CO USA 5.CALTECH, Jet Prop Lab, Pasadena, CA USA 6.Univ Cologne, Inst Phys, D-50937 Cologne, Germany 7.Purple Mt Observ, Qinghai Stn, Delingha 817000, Peoples R China 8.Chinese Acad Sci, Key Lab Radio Astron, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Yuefang,Liu, Tie,Meng, Fanyi,et al. GAS EMISSIONS IN PLANCK COLD DUST CLUMPS-A SURVEY OF THE J=1-0 TRANSITIONS OF (CO)-C-12, (CO)-C-13, AND (CO)-O-18[J]. ASTROPHYSICAL JOURNAL,2012,756(1). |
| APA | Wu, Yuefang,Liu, Tie,Meng, Fanyi,Li, Di,Qin, Sheng-Li,&Ju, Bing-Gang.(2012).GAS EMISSIONS IN PLANCK COLD DUST CLUMPS-A SURVEY OF THE J=1-0 TRANSITIONS OF (CO)-C-12, (CO)-C-13, AND (CO)-O-18.ASTROPHYSICAL JOURNAL,756(1). |
| MLA | Wu, Yuefang,et al."GAS EMISSIONS IN PLANCK COLD DUST CLUMPS-A SURVEY OF THE J=1-0 TRANSITIONS OF (CO)-C-12, (CO)-C-13, AND (CO)-O-18".ASTROPHYSICAL JOURNAL 756.1(2012). |
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来源：国家天文台
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