Cloud Structure of Three Galactic Infrared Dark Star-forming Regions from Combining Ground-?and Space-based Bolometric Observations
文献类型：期刊论文
| 作者 | Lin,Yuxin2,3; Liu,Hauyu Baobab4; Dale,James E.5; Li,Di2,6 ; Busquet,Gemma7; Zhang,Zhi-Yu4,8; Ginsburg,Adam4; Galván-Madrid,Roberto9; Kovács,Attila10; Koch,Eric11
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2017-05-02 |
| 卷号 | 840期号:1 |
| 关键词 | ISM: structure stars: formation submillimeter: ISM |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aa6c67 |
| 英文摘要 | Abstract We have modified the iterative procedure introduced by Lin et al., to systematically combine the submillimeter images taken from ground-based (e.g., CSO, JCMT, APEX) and space (e.g., Herschel, Planck) telescopes. We applied the updated procedure to observations of three well-studied Infrared Dark Clouds (IRDCs): G11.11?0.12, G14.225?0.506, and G28.34+0.06, and then performed single-component, modified blackbody fits to each pixel to derive ～10″ resolution dust temperature and column density maps. The derived column density maps show that these three IRDCs exhibit complex filamentary structures embedded with rich clumps/cores. We compared the column density probability distribution functions (N-PDFs) and two-point correlation (2PT) functions of the column density field between these IRDCs with several OB-cluster-forming regions. Based on the observed correlation between the luminosity-to-mass ratio and the power-law index of the N-PDF, and complementary hydrodynamical simulations for a 104 molecular cloud, we hypothesize that cloud evolution can be better characterized by the evolution of the (column) density distribution function and the relative power of dense structures as a function of spatial scales, rather than merely based on the presence of star-forming activity. An important component of our approach is to provide a model-independent quantification of cloud evolution. Based on the small analyzed sample, we propose four evolutionary stages, namely,?cloud integration, stellar assembly, cloud pre-dispersal, and dispersed cloud. The initial cloud integration stage and the final dispersed cloud stage may be distinguished from the two intermediate stages by a steeper than ?4 power-law index of the N-PDF. The cloud integration stage and the subsequent stellar assembly stage are further distinguished from each other by the larger luminosity-to-mass ratio (>40 ) of the latter. A future large survey of molecular clouds with high angular resolution may establish more precise evolutionary tracks in the parameter space of N-PDF, 2PT function, and luminosity-to-mass ratio. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-840-1-AA6C67 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/36000]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, UK 2.National Astronomical Observatories, Chinese Academy of Sciences, China 3.Max-Planck-Institut für Radioastronomie, D-53121 Bonn, Germany; ylin@mpifr-bonn.mpg.de 4.European Southern Observatory (ESO), Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany 5.Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, AL10 9AB, UK 6.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, China 7.Institut de Ciències de l’Espai (IEEC-CSIC), Campus UAB, Carrer de Can Magrans S/N, E-08193, Barcelona, Catalunya, Spain 8.Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK 9.Instituto de Radioastronomía y Astrofísica, UNAM, Apdo. Postal 3-72 (Xangari), 58089 Morelia, Michoacán, México 10.California Institute of Technology 301-17, 1200 East California Boulevard, Pasadena, CA 91125, USA |
| 推荐引用方式 GB/T 7714 | Lin,Yuxin,Liu,Hauyu Baobab,Dale,James E.,et al. Cloud Structure of Three Galactic Infrared Dark Star-forming Regions from Combining Ground-?and Space-based Bolometric Observations[J]. The Astrophysical Journal,2017,840(1). |
| APA | Lin,Yuxin.,Liu,Hauyu Baobab.,Dale,James E..,Li,Di.,Busquet,Gemma.,...&Walker,Daniel.(2017).Cloud Structure of Three Galactic Infrared Dark Star-forming Regions from Combining Ground-?and Space-based Bolometric Observations.The Astrophysical Journal,840(1). |
| MLA | Lin,Yuxin,et al."Cloud Structure of Three Galactic Infrared Dark Star-forming Regions from Combining Ground-?and Space-based Bolometric Observations".The Astrophysical Journal 840.1(2017). |
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来源：国家天文台
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