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, Yuxin1,2; Liu, Hauyu Baobab3; Dale, James E.4; Li, Di1,5 ; Busquet, Gemma6; Zhang, Zhi-Yu3,7; Ginsburg, Adam3; Galvan-Madrid, Roberto8; Kovacs, Attila9; Koch, Eric10
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2017-05-01 |
| 卷号 | 840期号:1 |
| 关键词 | ISM: structure stars: formation submillimeter: ISM |
| 英文摘要 | 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 similar to 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 M. 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 L-circle dot/M-circle dot) 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | PROBABILITY-DISTRIBUTION FUNCTIONS ; IN-FLIGHT PERFORMANCE ; GAS MASS FRACTION ; MOLECULAR CLOUDS ; HIERARCHICAL FRAGMENTATION ; TRIGONOMETRIC PARALLAXES ; DENSITY VARIANCE ; FORMATION RATES ; MACH NUMBER ; TURBULENCE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000400873400004 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8845]  |
| 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.Max Planck Inst Radioastron, D-53121 Bonn, Germany 3.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany 4.Univ Hertfordshire, Ctr Astrophys Res, Coll Lane, Hatfield AL10 9AB, Herts, England 5.Chinese Acad Sci, Key Lab Radio Astron, Beijing, Peoples R China 6.Inst Ciencies Espai IEEC CSIC, Campus UAB,Carrer Can Magrans S-N, E-08193 Barcelona, Catalunya, Spain 7.Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland 8.UNAM, Inst Radioastron & Astrofis, Apdo Postal 3-72 Xangari, Morelia 58089, Michoacan, Mexico 9.CALTECH, 301-17,1200 East Calif Blvd, Pasadena, CA 91125 USA 10.Univ Alberta, Dept Phys, 4-181 CCIS, Edmonton, AB T6G 2E1, Canada |
| 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]. 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.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".ASTROPHYSICAL JOURNAL 840.1(2017). |
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来源：国家天文台
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