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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
Wu, Yuefang1; Liu, Tie1; Meng, Fanyi2; Li, Di3,4,5; Qin, Sheng-Li6; Ju, Bing-Gang7,8
2012-09-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume756Issue:1Pages:76(24pp)
AbstractA 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.
KeywordDust, Extinction Ism: Clouds Ism: Kinematics And Dynamics Ism: Structure Stars: Formation Stars: protoStars
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/756/1/76
WOS KeywordYOUNG STELLAR OBJECTS ; INFRARED DARK CLOUDS ; MASS PROTOSTELLAR CANDIDATES ; MOLECULAR CLOUDS ; STAR-FORMATION ; DENSE CORES ; GALACTIC PLANE ; AMMONIA CORES ; MILKY-WAY ; NGC 1333
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000309044300076
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8107
Collection南极天文中心
Affiliation1.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
Recommended Citation
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):76(24pp).
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),76(24pp).
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):76(24pp).
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