MASSIVE QUIESCENT CORES IN ORION: DYNAMICAL STATE REVEALED BY HIGH-RESOLUTION AMMONIA MAPS
文献类型：期刊论文
| 作者 | Li, D.1,2,3 ; Kauffmann, J.4; Zhang, Q.5; Chen, W.6
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
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| 出版日期 | 2013-05-01 |
| 卷号 | 768期号:1 |
| 关键词 | instrumentation: interferometers ISM: clouds ISM: individual objects (Orion) stars: formation Online-only material: color figures |
| 英文摘要 | We present combined Very Large Array and Green Bank Telescope images of NH3 inversion transitions (1, 1) and (2, 2) toward OMC2 and OMC3. We focus on the relatively quiescent Orion cores, which are away from the Trapezium cluster and have no sign of massive protostars or evolved star formation. The 5 '' angular resolution and 0.6kms(-1) velocity resolution enable us to study the thermal and dynamic state of these cores at similar to 0.02 pc scales, comparable to or smaller than those of the current dust continuum surveys. We measure temperatures for a total of 30 cores, with average masses of 11 M-circle dot, radii of 0.039 pc, virial mass ratio (R-vir) over bar = 3.9, and critical mass ratio (R-C) over bar = 1.5. Twelve sources contain Spitzer protostars. The thus defined starless and protostellar subsamples have similar temperature, line width, but different masses, with an average of 7.3 M-circle dot for the former and 16 M-circle dot for the latter. Compared to other Gould Belt dense cores, more Orion cores have a high gravitational-to-kinetic energy ratio and more cores have a larger than unity critical mass ratio. Orion dense cores have velocity dispersions similar to those of cores in low-mass star-forming regions but larger masses for given size. Some cores appear to have truly supercritical gravitational-to-kinetic energy ratios, even when considering significant observational uncertainties: thermal and non-thermal gas motions alone cannot prevent collapse. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000317912900005 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5913]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China 2.Space Sci Inst, Boulder, CO USA 3.CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA 4.CALTECH, Dept Astron, Pasadena, CA 91125 USA 5.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 6.Peking Univ, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, D.,Kauffmann, J.,Zhang, Q.,et al. MASSIVE QUIESCENT CORES IN ORION: DYNAMICAL STATE REVEALED BY HIGH-RESOLUTION AMMONIA MAPS[J]. ASTROPHYSICAL JOURNAL LETTERS,2013,768(1). |
| APA | Li, D.,Kauffmann, J.,Zhang, Q.,&Chen, W..(2013).MASSIVE QUIESCENT CORES IN ORION: DYNAMICAL STATE REVEALED BY HIGH-RESOLUTION AMMONIA MAPS.ASTROPHYSICAL JOURNAL LETTERS,768(1). |
| MLA | Li, D.,et al."MASSIVE QUIESCENT CORES IN ORION: DYNAMICAL STATE REVEALED BY HIGH-RESOLUTION AMMONIA MAPS".ASTROPHYSICAL JOURNAL LETTERS 768.1(2013). |
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来源：国家天文台
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