Clouds, filaments, and protostars: The Herschel Hi-GAL Milky Way
文献类型：期刊论文
| 作者 | Molinari, S.1; Swinyard, B.2; Bally, J.3; Barlow, M.4,5,6; Bernard, J. -P.; Martin, P.7; Moore, T.8; Noriega-Crespo, A.9; Plume, R.10; Testi, L.11,12 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2010-07-01 |
| 卷号 | 518 |
| 关键词 | stars: formation ISM: structure ISM: clouds Galaxy: general |
| 英文摘要 | We present the first results from the science demonstration phase for the Hi-GAL survey, the Herschel key program that will map the inner Galactic plane of the Milky Way in 5 bands. We outline our data reduction strategy and present some science highlights on the two observed 2 degrees x 2 degrees tiles approximately centered at l = 30 degrees and l = 59 degrees. The two regions are extremely rich in intense and highly structured extended emission which shows a widespread organization in filaments. Source SEDs can be built for hundreds of objects in the two fields, and physical parameters can be extracted, for a good fraction of them where the distance could be estimated. The compact sources (which we will call cores' in the following) are found for the most part to be associated with the filaments, and the relationship to the local beam-averaged column density of the filament itself shows that a core seems to appear when a threshold around A(V) similar to 1 is exceeded for the regions in the l = 59 degrees field; a A(V) value between 5 and 10 is found for the l = 30 degrees field, likely due to the relatively higher distances of the sources. This outlines an exciting scenario where diffuse clouds first collapse into filaments, which later fragment to cores where the column density has reached a critical level. In spite of core L/M ratios being well in excess of a few for many sources, we find core surface densities between 0.03 and 0.5 g cm(-2). Our results are in good agreement with recent MHD numerical simulations of filaments forming from large-scale converging flows. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000281527200101 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7811]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.INAF Ist Fis Spazio Interplanetario, I-00133 Rome, Italy 2.Rutherford Appleton Labs, STFC, Didcot, Oxon, England 3.Univ Colorado, Dept Astrophys & Planetary Sci, CASA, Boulder, CO 80309 USA 4.UCL, Dept Phys & Astron, London, England 5.Univ Toulouse, UPS, CESR, Toulouse, France 6.CNRS, UMR5187, Toulouse, France 7.Univ Toronto, Dept Astron & Astrophys, Toronto, ON, Canada 8.Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5UX, Merseyside, England 9.CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA 10.Univ Calgary, Dept Phys & Astron, Calgary, AB T2N 1N4, Canada |
| 推荐引用方式 GB/T 7714 | Molinari, S.,Swinyard, B.,Bally, J.,et al. Clouds, filaments, and protostars: The Herschel Hi-GAL Milky Way[J]. ASTRONOMY & ASTROPHYSICS,2010,518. |
| APA | Molinari, S..,Swinyard, B..,Bally, J..,Barlow, M..,Bernard, J. -P..,...&Zhang, Q..(2010).Clouds, filaments, and protostars: The Herschel Hi-GAL Milky Way.ASTRONOMY & ASTROPHYSICS,518. |
| MLA | Molinari, S.,et al."Clouds, filaments, and protostars: The Herschel Hi-GAL Milky Way".ASTRONOMY & ASTROPHYSICS 518(2010). |
入库方式： OAI收割
来源：国家天文台
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